Loading...
HomeMy WebLinkAboutCorrespondenceDave Argo From: Dave Argo Sent: Thursday, August 15, 2019 2:54 PM To: 'Kurt Carruth' Subject: Casas ADU - Permit #BLRE-07-19-5868 Attachments: 2 -Family Fire Reqts.pdf Kurt: We have reviewed plans for a proposed upstairs ADU Addition at an existing single-family residence for Casas located at Cerise Ranch, Lot 8. However, before we can finalize our review and issue a permit we need for the following items to be addressed: 1. Soils Report — Please provide our office with a digital copy of the soils report as referenced on the Structural plans. 2. Structural Plans — The structural plans submitted are clearly identified as "Not For Construction" and we need to be provided with construction plans in order to issue a building permit. Please submit (2) full-size copies of drawings issued for construction to our office so that we can insert them into the approved plan set. 3. Garage Foundation & Framing Plans — Please provide explanation of Garage plans shown in the lower right- hand corner of Structural Sheets S2.01 and 52.02 as these drawings don't appear to coordinate or align with the large -size plans also shown on these drawing sheets. Are these plans intended to show new roof framing above the ADU? If so, please clarify. 4. Fire Separation Requirements between ADU & Existing Residence/Garage — With submitted plans, there is no information provided as to the one-hour fire separation requirements as per the Building Code. Refer to the "Information Sheet & Policy Directive" as attached to this email for more specific requirements and references to pertinent sections of I.R.C. for fire separation requirements at "Two -Family Dwellings" and submit to our office information described under items #1 and #3 on the Information Sheet. Thank you for your prompt attention to these items, and we will place this project in our "pending" file until we receive all of the requested information. Dave Argo Plans Examiner CGarfield County Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 81601 Tel: 970-945-8212 Ext. 1610 Email: dargo@garfield-county.com Web: garfield-county.com 1 Garfield County BUILDING DEPARTMENT 108 Eighth Street, Suite 401, Glenwood Springs, CO 81601 Tel: (970) 945-8212 INFORMATION SHEET & POLICY DIRECTIVE August 2019 Fire Separation between Primary Residence & Accessory Dwelling Unit A Secondary or Accessory Dwelling Unit (ADU) located within the same structure as the primary dwelling unit invokes certain Building Code provisions that require proper detailing of construction assemblies on the part of the designer, as well as proper execution at the job site by the builder. Building Code requirements for "two-family dwellings" address fire -rated construction assemblies at walls, floors and/or roofs, as well as the penetrations that may occur in these fire-resistant building elements. Fire separation requirements of two family dwellings are described in detail in Sections R302.3 — R302.4 of the 2015 International Residential Code. For more detailed information, refer to the attached requirements as excerpted from I.R.C. Code & Commentary — Volume 1. Garfield County residential projects with two or more dwelling units in the same structure require a Colorado licensed Architect. The Architect shall specifically address key fire resistance provisions of the Building Code (as referenced above), and the Architect must wet seal/stamp drawings submitted along with the building permit application. Drawings prepared by the Architect and submitted to the Building Department shall include: 1. For All Projects — Clearly identify location and extent of all fire -rated assemblies between adjacent dwelling units — as shown on floor plans, building sections, details — and including the following requirements: a. Construction assemblies of both vertical and/or horizontal separations are required to meet a one-hour fire -resistance rating (*Note: Fire sprinklers reduce fire -rating to 30 minutes). b. Floor/ceiling and wall assemblies shall extend to and be tight against exterior walls. Wall assemblies shall extend from foundation up to underside of roof sheathing. c. Where floor assemblies are required to be fire -resistance rated, supporting construction (walls, beams, posts) shall have an equal or greater fire -resistance rating. d. Penetrations (including electrical, recessed lights & mechanical ductwork) located within fire -rated assemblies shall comply with specific requirements. 2. For New Construction Projects — Show detailed drawings or otherwise describe wall, floor, ceiling, and roof fire -rated assemblies. Reference numbers of approved construction assemblies from nationally recognized agencies (for example, Underwriters' Laboratories, U.S. Gypsum Association, etc.) may be submitted, but descriptive specifications and/or illustrations must also be included. 3. For Retrofit/Remodel Projects — In lieu of specific documentation for the original structure, the Building Department may accept installation of (2) layers of 5/8" Type X drywall at one side of wall, floor/ceiling, or roof assemblies to provide the required one-hour fire rating between adjacent dwelling units. The Architect may otherwise provide alternative fire resistance rating for assembly components as per Chapter 7 of the 2015 I.B.C. Attachments: • "Two -Family Dwellings — Fire Separation Requirements" as excerpted from 2015I.R.C. Code/Commentary Two -Family Dwellings: Fire Separation Requirements ROOF SLOPE . �'.� I+—SFT—s' MORE THAN 2:12 ROOF SLOPE OF 2:12 OR LESS PARAPET MUST EXTEND TO NOT LESS THAN 1 �WITHINADISTOANCE PORTION FTON OF THE ROOF 1 I� 30 IN. MIN (ADJACENT ROOF NOT SHOWN FOR CLARITY) For SI: 1 inch = 25.4 mm, 304.8 mm. Figure R302.2.3 PARPET REQUIREMENTS R302.2.4 Structural independence. Each individual town- house shall be structurally independent. Exceptions: 1. Foundations supporting exterior walls or common walls. 2. Structural roof and wall sheathing from each unit fastened to the common wall framing. 3. Nonstructural wall and roof coverings. 4. Flashing at termination of roof covering over com- mon wall. 5. Townhouses separated by a common wall as pro- vided in Section R302.2, Item 1 or 2. • Each townhouse must be structurally independent and capable of being removed without affecting the adja- cent dwelling unit. This provision is applicable only to townhouses, not two-family dwellings. This indepen- dence is useful not only in the event of a fire in one unit, but also during any remodeling or alteration. The objective of this structural independence is that a com- plete burnout could occur on one side of the wall with- out causing the collapse of the adjacent townhouse. This condition occurs rarely. The provision also helps if there is ever a fire or other problem by creating a clear separation between the units. With separate owner- ship and each owner having a different insurance com- pany, the ability to gain access or get repairs made can be difficult and time consuming. By having clearly sep- arated units, it is much easier to determine who is responsible and to make any needed repairs. The code lists five exceptions that waive the struc- tural independence requirement. A quick review of the exceptions shows that they generally deal with items BUILDING PLANNING that will not structurally affect townhouses should a problem develop in the adjacent dwelling unit. Excep- tion 1 is based on the norm within the industry for foun- dation construction. In the code, Section R402 lists only wood and concrete within the foundation materi- als section, although Section R404 accepts masonry foundation walls. In general, concrete and masonry are the most common types of foundations; wood foun- dations are viewed as unique. Given the performance of both masonry and concrete, and the fact that these foundation systems must sustain loads from both the structure and the adjacent soils, it is reasonable to assume that the foundation will not be the item that fails in most situations. Permitting a common founda- tion also helps solve other problems that would arise if the structural independence issue were taken as an absolute. An example where requiring separate foun- dations would probably create more problems or diffi- culty is in the dampproofing or waterproofing of below - grade foundation walls. If a wood foundation is used between adjacent units, what is the level of fire protection that may be needed? Because concrete and masonry foundations are the norm, it would be easy to forget or overlook protecting the foundation when it is constructed of wood. In these cases, it would seem appropriate to deal with the foun- dation as any other wall, and protect it on any exposed side. The level of fire resistance should be equal to that of the wall or walls that the foundation supports. R302.3 Two-family dwellings. Dwelling units in two-family dwellings shall be separated from each other by wall and floor assemblies having not less than a 1 -hour fire -resistance rating where tested in accordance with ASTM E119 or UL 263. Fire -resistance -rated floor/ceiling and wall assemblies 2015 INTERNATIONAL RESIDENTIAL CODE® COMMENTARY 3-47 BUILDING PLANNING shall extend to and be tight against the exterior wall, and wall assemblies shall extend from the foundation to the underside of the roof sheathing. Exceptions: 1. A fire -resistance rating of /2 hour shall be permitted in buildings equipped throughout with an automatic sprinkler system installed in accordance with NFPA 13. 2. Wall assemblies need not extend through attic spaces where the ceiling is protected by not less than 5/0 -inch (15.9 nam) Type X gypsum board, an attic draft stop constructed as specified in Section R302.12.1 is pro- vided above and along the wall assembly separating the dwellings and the structural framing supporting the ceiling is protected by not less than 1/, -inch 02.7 mm) gypsum board or equivalent. ❖ Most of the nation's fires occur in rest sentia • ui u Ings, particularly one- and two-family dwellings. These fires account for more than 80 percent of all deaths from fire in residential uses (including hotels, apartments, dor- mitories, etc.) and about two-thirds of all fire fatalities in any type of building. One- and two-family dwellings also account for more than 80 percent of residential property losses and more than one-half of all property losses from fire. Despite this poor fire record, there is widespread resistance to mandating much in the way of fire protection systems or methods because of our society's belief that people's homes are their castles. This viewpoint has limited the types of protection that aro imposed on these private homes to the installation of smoke alarms and the more recent requirement of dwelling unit separation. Section R302.3 provides a separation for protection of the occupants of one dwell- ing unit in a two-family dwelling from the actions of their neighbor in the adjacent dwelling unit. To accomplish this protection, the code addresses separation between the units, structural support and any openings or penetrations of the separation. Depending on the layout of the various dwelling units, Section R302.3 requires that the walls and/or floor assemblies that divide one dwelling unit from the adjacent unit be at least 1 -hour fire -resistance rated. See Commentary Figure R302.3 for examples of the separation. The separation rating is to be determined by either ASTM E119 or UL 263, which is the normal test used for determining fire resistance. Many tested assemblies are available for use in these locations. The provisions of the section also address the con- tinuity of the separation, so that one dwelling unit Is completely divided from the other. The horizontal aspect of the separation, which requires that the assemblies extend to and be tight against the exterior wall, is not difficult to comply with. It is most likely the vertical aspect (continuing a wall assembly to the underside of the roof sheathing) that will require some detailed planning, careful construction and careful inspection for the units to be separated. Exception 1 grants a reduction in the required sepa- ration for those cases in which the building is equipped with an automatic sprinkler system. In these cases, a rating of/2 hour is permitted versus a 1 -hour fire -resis- tance rating. The sprinkler system must be "installed in accordance with NFPA 13," and is to be installed "throughout" the building. The type of sprinkler system used must meet NFPA 13 and may not be Installed to either NFPA 13D or 13R, even though those two stan- dards do address certain types of residential uses. The word "throughout" requires that the sprinkler system be installed in all portions of both dwelling units and any i -HR FIRE-RES1STANT WALL TO EXTEND TO UNDERSIDE OF ROOF SHEATHING DWELLING UNIT D DWELLING UNIT B DWELLING UNIT A DWELLING UNIT B - 1-111{ FLUUWI;tILINL AJ,CMtSLY TO EXTEND TO EXTERIOR WALL (SUPPORT PER SECTION R302.3.1 IS REQUIRED) Figure R302.3 DWELLING UNIT SEPARATIONS IN TWO-FAMILY DWELLINGS 3-48 2015 INTERNATIONAL RESIDENTIAL CODE® COMMENTARY common spaces. The provisions of NFPA 13 that per- mit omitting sprinklers in certain areas, such as small concealed spaces, are applicable. Therefore, the pro- vision requires a complying sprinkler system "through- out" the building (that is, In all areas of the building that must be protected according to the standard), and It does not accept any partial system, such as one installed in only one dwelling unit or only in the base- ment level of both units. Exception 2 addresses separation in the area of the attic of two-family dwellings or duplexes. As long as an attic draft stop Is present that meets the requirements in Section R302.12.1, the 1 -hour fire separation is per- mitted to stop at a ceiling constructed of'f Inch (15.9 Trim) Type X gypsum board. This may be beneficial as, In many cases, the type of truss or attic rafter and rafter tie/collar tie configuration will prohibit continuing con- struction of the 1 -hour separation wall all the way up to the roof sheathing. 8302.3.1 Supporting construction. Where floor assemblies are required to be fire -resistance rated by Section R302.3, the supporting construction of such assemblies shall have an equal or greater fire -resistance rating. + This provision applies only to walls that support the fire -resistance -rated floor assemblies that form the separation between dwelling units in a two-family dwelling where the dwelling units are stacked verti- cally. When either all or portions of a dwelling unit sep- aration are provided by a floor assembly, the code requires that the structural supports for the separation have a rating equal to or higher than the floor. This is conceptually similar to the garage separation of Sec- tion R302.6. Without the supporting construction being protected, a fire on the lower level could lead to an early failure of the dwelling unit separation (see Com- mentary Figure R302.3.1). DWELLING UNIT SEPARATION DWELLING UNIT A DWELLING UNITS SUPPORTING CONSTRUCTION -Y REQUIRES EQUAL OR GREATER FIRE -RESISTANCE RATING Figure R302.3.1 SUPPORT OF DWELLING UNIT SEPARATION R302.4 Dwelling unit rated penetrations. Penetrations of wall or floor -ceiling assemblies required to be fire -resistance raced in accordance with Section R302,2 or R302.3 shall be protected in accordance with this section. + This section addresses the specific requirements for maintaining the integrity of fire -resistance -rated 2015 INTERNATIONAL RESIDENTIAL CODE® COMMENTARY BUILDING PLANNING assemblies at penetrations. If the penetration of a rated assembly is not properly constructed, the assem- bly Itself is jeopardized and may not perform as intended. The provisions of this section apply to pene- trations of fire -resistance -rated walls and floor/ceiling assemblies that are a part of the dwelling unit separa- tion in either two-family dwellings or townhouses. Pen- etrations of the rated assemblies range from combustible pipe and tubing to noncombustible wiring with combustible covering to noncombustible items, such as pipe, tube, conduit and ductwork. Each type of penetration requires a specific method of protection, which is based on the type of fire -resis- tance -rated assembly penetrated and the size and type of the penetrating item. The first step in determin- ing the type of penetration protection required is to identify whether a wall or floor/ceiling assembly is being penetrated. The next step is to determine the type of penetrating item and whether it is a membrane or through penetration. Once these factors are known, then the applicable section must be applied and the applicable method of protection must be decided upon. R302.4.1 Through penetrations. Through penetrations of fire -resistance -rated wall or floor assemblies shall comply with Section R302.4.1,1 or 8302.4.1.2. Exception: Where the penetrating items are steel, ferrous or copper pipes, tubes or conduits, the annular space shall be protected as follows: 1. In concrete or masonry wall or floor assemblies, concrete, grout or mortar shall be permitted where installed to the full thickness of the wall or floor assembly or the thickness required to maintain the fire -resistance rating, provided that both of the fol- lowing are complied with: 1.1. The nominal diameter of the penetrating item is not more than 6 inches (152 mm). 1.2. The area of the opening through the wall does not exceed 144 square inches (92 900 mm2). 2. The material used to fill the annular space shall pre- vent the passage of flame and hot gases sufficient to ignite cotton waste where subjected to ASTM E119 or UL 263 time temperature fire conditions under a positive pressure differential of not less than 0.01 inch of water (3 Pa) at the location of the penetration for the time period equivalent to the fire -resistance rating of the construction penetrated. This section contains the general requirements for through penetrations, which are penetrations that pass through an entire assembly. A through penetration is in contrast to a membrane penetration, which creates a penetration through only one side of an assembly. Membrane penetrations are addressed later in Section R302.4.2. See Commentary Figure R302.4.1 for an illustration of these two types of penetrations. Through penetrations must be protected to maintain the fire resistance of the penetrated assembly. The code states two methods, found in Sections R302.4.1.1 and R302.4.'1.2, which can be used to 3-49 BUILDING PLANNING assure the adequacy of the penetration protection. The difference between these two is the test methodology used, but they both provide essentially the same results. The commentary for those sections is addi- tional discussion of the differences. Based on the history of these provisions and on the wealth of fire test data that exists concerning items such as conduit, wafer piping and other similar pene- trations, the code provides two exceptions that permit protection by methods other than those generally required. The first permits the use of concrete, grout or mortar to protect certain penetrations of concrete and masonry wall or flour assemblies. The concrete, grout or mortar must be applied for the full thickness of the assembly unless evidence can be produced demon- strating that the required fire -resistance rating can be achieved with a lesser depth. Concrete. grout and mor- tar have traditionally been used as protection for the annular space in penetrations of concrete and masonry assemblies. Experience has shown this form of protection to be viable. However, caution must be used any time something, such as a water pipe or con- duit, is placed in concrete or masonry. Sections P2603.3 and P2603.5 cuntain examples of protection of plumbing systems. Exception 2 addresses the space between the pen- etrating item and the original assembly construction. This gap Is called the annular space, and this excep- tion provides a method to simply evaluate the perfor- mance of the material used to fill that space. It is often mistakenly believed that this exception permits a vari- ety of untested items, but as can be seen from the pro- vision itself, the materials need to meet a specific performance level. This exception requires that the ability of the material to prevent the passage of flame and hot gases sufficient to ignite cotton when sub- jected to the time -temperature criteria of the ASTM E119 test standard be prequalified. This requirement is similar to provisions found in both ASTM E119 and ASTM E814, the standards used to evaluate fire-resis- --THROUGH PENETRATION SEC. R302.4.1 MEMBRANE PENFTRATIONS SEC. 8302.4.2 Figure R302.4.1 TYPES OF PENETRATIONS tent assemblies and penetration protection. Because it is very likely that the penetration in the actual fire will be exposed to a positive pressure, this section specifies that the test -fire exposure include a positive pressure of 0.01 Inch (0.25 mm) of water column as a further means to verify the performance of this protection method Thus•the protection will not be blown out or moved from its place during a fire. R302,4.1.1 Fire -resistance -rated assembly. Penetrations shall be installed as tested in the approved fire -resistance - rated assembly. + This section addresses situations in which the penetra- tion is tested as a part of the regular full-scale test for the wall or floor/ceiling assembly. The penetration and proposed type of protection are evaluated as a pert of the regular ASTM E119 test, which evaluates the wall or floor/ceiling rating. This section and the option it pro- vides are not used frequently because of the cost of conducting such full-scale tests and the limitations placed on the application of the tested assembly. Because of these issues, penetrations are most often protected in accordance with one of the exceptions in Section R302,4,1 or the provisions of Section R302.4.1.2. R302.4.1.2 Penetration firestop system. Penetrations shall be protected by an cippr•oved penetration firestop system installed as tested in accordance with ASTM £114 or UL 1479, with a positive pressure differential of not less than 0.01 inch of water (3 Pa) and shall have an F rating of not less than the required fire -resistance rating of the wall or floor - ceiling assembly penetrated. + Through -penetration firestop systems consist of spe- cific materials or an assembly of materials that are designed to restrict the passage of fire and hot gases for a prescribed period of time through openings made in fire -resistance -rated assemblies. To determine the effectiveness of a through -penetration firestop system in restricting the passage of fire, and to determine that the penetration has not jeopardized the original fire- resistant assembly, firestop systems must be subjected to fire testing using the ASTM E614 or UL 1479 test standard. This is a small-scale test method developed specifically for the evaluation of a firestop system's abil- ity to resist the passage of flame and hot gases, with- stand thermal stresses and restrict the transfer of heat ['trough the penetrated assembly. There aro hundreds if not thousands of tested through -penetration firestop systems available today. The actual type of system used will depend on the type and construction of the assembly being penetrated, the material makeup and size of the penetrating Item, and the size of the annular space that exists between the penetrating item and the assembly being penetrated. Because there are a multi- tude of products available, and there is no "one size fits ell" system available, it Is helpful if the methods of pro- tection are included on the construction documents as covered by Section R106.1.1. The actual rating of the through -penetration firestop system Is generated from the results of the testing and 3-50 2015 INTERNATIONAL RESIDENTIAL CODE° COMMENTARY is reported as an "F" (flame) rating and a "T" (tempera- ture) rating. The code requires only an F rating. The F rating indicates the period of time, In hours, that the through -penetration firestop system remained in place without allowing the passage of fire during the fire expo- sure test, or the passage of water during the hose stream portion of the test. The required F rating must be equal to the fire -resistance rating of the wall orfoorlceil- ing assembly that Is being penetrated. This means either a 1- or 2 -hour rating, depending on the dwelling unit separation. Two of the most common materials used In through - penetration firestop systems are Intumescent and endothermic materials. Intumescent materials expand approximately 8 to 10 times their original volume when exposed to temperatures exceeding 250°F (121°C). The expansion of the material fills the voids or openings within the penetration to resist the passage of flame, while the outer layer of the expanded intumescent material forms an insulating charred layer that assists in limiting the transfer of heat. The expansion properties of intumescent materials allow them to seal openings left by combustible penetrating items that burn away during a fire, but they do not retard heat as well as endothermic materials. Intumescent materials are typically used with combustible penetrating items or where a higher T rat- ing is not required. Endothermic materials provide protection through chemically bound water released in the form of steam when exposed to temperatures exceeding 600°F (316°C). This released water cools the penetration and retards heat transfer through the penetration. Endother- mic materials tend to be superior in heat -transfer resis- tance and have higher T ratings, but they do not expand to fill voids left by combustible penetrating items that burn away during a fire. Therefore, endothermic mate- rials are typically used with noncombustible penetrating items and where a higher T rating is required. R302.4.2 Membrane penetrations. Membrane penetrations shall comply with Section 8302.4.1. Where walls are required to have tt fire -resistance rating, recessed fixtures shall lie installed so that the required fire -resistance rating will not be reduced. Exceptions: 1. Membrane penetrations of not more than 2 -hour fire - resistance -rated walls and partitions by steel electri- cal boxes that do not exceed 16 square inches (0.0103 m2) in area provided that the aggregate area of the openings through the membrane docs not exceed 100 square inches (0.0645 m2) in any 100 square feet (9.29 m2) of wall area. The annular space between the wall membrane and the box shall not exceed ifa inch (3.1 mm). Such boxes on opposite sides of, the wall shall be separated by one of the following: 1.1. By a horizontal distance of not less than 24 inches (610 mm) where the wall or partition is constructed with individual noncommuni- cating stud cavities. 2015 INTERNATIONAL RESIDENTIAL CODE® COMMENTARY BUILDING PLANNING 1.2. By a horizontal distance of not less than the depth of the wall cavity where the wall cav- ity is filled with cellulose loose -fill, rock - wool or slag mineral wool insulation. 1.3. By solid freblocking in accordance with Section R302.11. 1.4. By protecting both boxes with listed putty pads. 1.5. By other listed materials and methods. 2. Membrane penetrations by listed electrical boxes of any materials provided that the boxes have been tested for use in fire -resistance -rated assemblies and are installed in accordance with the instructions included in the listing. The annular space between the wall membrane and the box shall not exceed '/e inch (3.1 mm) unless listed otherwise. Such boxes on opposite sides of the wall shall be separated by one of the following; 2.1. By the horizontal distance specified in the listing of the electrical boxes. 2.2. By solid fireblocking in accordance with Section R302.11. 2.3. By protecting both boxes with listed putty pads. 2.4. By other listed materials and methods. 3. The annular space created by the penetration of a fire sprinlder provided that it is covered by a metal escutcheon plate. ❖ This section deals with instances where only a single side of the fire -resistance -rated assembly is pene- trated. This would be the situation for items such as electrical outlet boxes or plumbing fixtures located on one side of the wall only. Commentary Figure R302.4.1 shows this type of penetration. For the most part, a membrane penetration is to be protected by one of the previously described methods established for through penetrations. However, there are some penetrations that are allowed without a specific firestopping material in the annular space around them. These are addressed by the exceptions. This section also deals with the installation of recessed luminaires in fire -resis- tance -rated assemblies and states that their installation may not reduce the assembly's protection. Although these fixtures are common, they do represent a pene- tration of the assembly's protection and must be installed so that the assembly is not compromised. Exception 1 allows penetrations of steel electrical outlet boxes under certain conditions. The criteria of this section limit the size of the box to 16 square inches (0.0103 m2) or less in area and to an aggregate area not to exceed 100 square inches (64 500 mm2) in each 100 square foot (9.3 m2) area. Commentary Figure R302.4.2(1) shows some of the requirements of this section. The area limitations are consistent with the cri- teria from fire tests, which have shown that within these limitations, these penetrations will not adversely affect the fire -resistance rating of the assembly. However, the 3-51 BUILDING PLANNING boxes are assumed to be installed as they were during the fire tests. In general, the test requirements match the limitations shown by the code regarding their size and the need to be offset. An additional requirement, one that does not appear in the code, regulates the size of the annular space created around the outlet hexes. Both the Underwriters Laboratory's (UL) Fire -Resis- tance Directory and the Gypsum Association's Fire - resistance Design Manual specify a maximum over -cut of /8 Inch (3 mm) for the annular space around the out- let boxes. Additionally, Article 314 of the National Elec- trical Code (NEC) (also known as NFPA 70) includes the size limitation of the over -cut. Therefore, the excep- tion applies only when the boxes are installed as they were during the original fire tests, including the limited annular space. Because outlet boxes on both sides of a wall create penetrations of both layers of a wall assem- bly's protection, the code provides five methods to address this problem. This gives code users several options and does not limit them to the usual 24 -inch {510 mm) offset. Exception 2 permits using outlet boxes of nonmetallic materials if they have been specifically tested. Because COMPLYING STEEL ELECTRICAL BOX • many different types of nonmetallic boxes are available, It is important to determine that the boxes being used in the rated dwelling unit separation have been tested. Although the exception applies to nonmetallic electrical outlet boxes, the same concept would apply to steel boxes that exceed the sizes specified in Exception 1. Exception 3 provides an alternative to the annular space protection provisions for a firo sprinkler that pen otrates a single membrane. This exception is available if the annular space around the sprinkler is completely covered by an escutcheon plate of noncombustible material. The nature of the hazard posed by single - membrane penetrations of the sprinkler Is limited by the size of the opening, the potential number of openings present and the presence of a sprinkler system. The installation of a noncombustible escutcheon provides protection against the free passage of lire through the annular space and allows for the movement of the sprinkler piping without breaking during a seismic event [see Commentary Figure R302.4.2(2)]. FIRE -RESISTANCE - RATED WALL MIN 24 IN. _. SEPARATION BOX SIZE: 510 SQ IN. WITH MAX OF 100 SQ IN, PER 100 SQ FT OF WALL PLAN SECTION OF WALL STEEL ELECTRICAL OUTLET BOX PENETRATION For SI: 1 Inch = 25.4 mm, 1 square Inch = 645 mm2, 1 square foot = 0.0929 m2. Figure R302.4.2(1) MEMBRANE PENETRATION BY OUTLET BOX ANNULAR SPACE AT SPRWKLER PENETRATION NOT REQUIRED TO BE PROTECTED WHERE COVERED BY METAL ESCUTrH FoN PLATE - r- CEILING MEMBRANE ESCUTCHEON PLATE PENDENT SPRINKLER Figure R302.4.2(2) EXCEPTION TO ANNULAR SPACE PROTECTION 342 2015 INTERNATIONAL RESIDENTIAL CODE° COMMENTARY Dave Argo From: Dave Argo Sent: Thursday, August 15, 2019 4:04 PM To: 'Kurt Carruth' Subject: RE: Casas ADU - Permit #BLRE-07-19-5868 Kurt: Thanks for your timely reply. All good with items #1— 3. Maybe when the Structural drawings are resubmitted the future garage can be deleted from those 2 sheets? In regard to item #4, fire separation between dwelling units needs to be clearly illustrated (floor plans, sections and/or details). Narrative specifications may suffice in lieu of details at garage supporting walls and underside of floor assembly. But I think we need to see a wall section/detail at the party wall between units at upper level since it needs to extend up to the underside of the upper roof sheathing. The point is to provide the builder (not just the Building Dept.) enough information so that they can get it built right. Dave Argo Plans Examiner CGarfield County Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 81601 Tel: 970-945-8212 Ext. 1610 Email: dargo@garfield-county.com Web: garfield-county.com From: Kurt Carruth [mailto:kurt@hinge-architects.com] Sent: Thursday, August 15, 2019 3:10 PM To: Dave Argo <dargo@garfield-county.com> Subject: [External] Re: Casas ADU - Permit #BLRE-07-19-5868 Replied below in red. Thanks - Kurt Carruth, architect hing ARCHITECTS, Ltd. 812 grand avenue, ste. 201 gws, co. 81601 c:970-309-4432 www.hinae-architects.com On Thu, Aug 15, 2019 at 2:57 PM Dave Argo <dargo@a,garfield-county.com> wrote: 1 Kurt: We have reviewed plans for a proposed upstairs ADU Addition at an existing single-family residence for Casas located at Cerise Ranch, Lot 8. However, before we can finalize our review and issue a permit we need for the following items to be addressed: 1. Soils Report — Please provide our office with a digital copy of the soils report as referenced on the Structural plans. I think that may be a 'stock' note, as the only structure we are adding is deck columns (sonotubes) and front side stairway / column supports. The structural engineer did not think we needed to have a full soils report with the limited structural addition. We can have a soils guy go out and inspect the holes once we dig them if you need us to. 2. Structural Plans — The structural plans submitted are clearly identified as "Not For Construction" and we need to be provided with construction plans in order to issue a building permit. Please submit (2) full-size copies of drawings issued for construction to our office so that we can insert them into the approved plan set. Yes, will update. 3. Garage Foundation & Framing Plans — Please provide explanation of Garage plans shown in the lower right-hand corner of Structural Sheets 52.01 and S2.02 as these drawings don't appear to coordinate or align with the large -size plans also shown on these drawing sheets. Are these plans intended to show new roof framing above the ADU? If so, please clarify. No, this is a future Garage plan and I am not really sure why he included it here. Please disregard as it will be a separate permit submittal at a later date. 4. Fire Separation Requirements between ADU & Existing Residence/Garage — With submitted plans, there is no information provided as to the one-hour fire separation requirements as per the Building Code. Refer to the "Information Sheet & Policy Directive" as attached to this email for more specific requirements and references to pertinent sections of I.R.C. for fire separation requirements at "Two -Family Dwellings" and submit to our office information described under items #1 and #3 on the Information Sheet. Yes, will do this as well. Do you need a drawn detail or can I just add a note to the plans stating our approach? Thank you for your prompt attention to these items, and we will place this project in our "pending" file until we receive all of the requested information. Dave Argo Plans Examiner ,y . Garfield County Community Development Department 2 Dave Argo From: Kurt Carruth <kurt@hinge-architects.com> Sent: Monday, August 19, 2019 10:55 AM To: Dave Argo Subject: [External] Re: Casas ADU - Permit #BLRE-07-19-5868 Attachments: Casas - Kubler Res STRUCTURAL PERMIT SET (1) 7-16-19.pdf; A2.1 - 08-19-19.pdf; A2.2 - 08-19-19.pdf; A4.1 - 08-19-19.pdf; A4.2 - 08-19-19.pdf On Thu, Aug 15, 2019 at 4:04 PM Dave Argo <dargo�7a,garfield-county.com> wrote: Kurt: Thanks for your timely reply. All good with items #1— 3. Maybe when the Structural drawings are resubmitted the future garage can be deleted from those 2 sheets? I crossed them out and added a note that it was not part of this permit. The engineer's draftsperson is out of town for like a week, and I need to keep it all moving - if possible. Let me know if you absolutely need it removed. In regard to item #4, fire separation between dwelling units needs to be clearly illustrated (floor plans, sections and/or details). Narrative specifications may suffice in lieu of details at garage supporting walls and underside of floor assembly. I updated the sections with notes and callouts as to where the two layers of type "X" is to be located. PIs. review and get back to me that this works. But I think we need to see a wall section/detail at the party wall between units at upper level since it needs to extend up to the underside of the upper roof sheathing. The point is to provide the builder (not just the Building Dept.) enough information so that they can get it built right. Dave Argo Plans Examiner C. Garfield County Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 81601 1 a ceding to have (2) slayers of 5/8" Type'X' drywall attached (2) layers of 5/8' Type'X' drywall fSL TWO STORY WOOD & STUCCO FRAME HOUSE 221 LARKSPUR DRIVE ceiling layers of drywall GARAGE TO REMAIN WINDOWS TO REMAIN (2) layers of 5/8" Type'X' drywall (2)) Tyypee x aLta.c ed LL I1 11 1 1 1 1 1 1 1 1 1 1 1 1 1 211-01” 7•-5 MAIN HOUSE TO REMAIN NEW STAIRS WRAP VENEER C-) AROUND STAIR WALL ASPHALT DRIVEWAY ENTRY LEVEL Scale: 1/4" = * NO CHANGE TO LOWER LEVEL SQUARE FOOTAGE. N• f09'9( 1007 00"Z * ALL WINDOWS / EXT. DOORS TO BE U .35 OR BETTER 221 Larkspur Ln. Cerise Ranch DRAWING icsdE DRC SUBMITTAL 04-29-19 DRC UPDATE 05-21-19 DRC UPDATE 05-30-19 DRC UPDATE 06-16-19 PERMIT SET 07-19-19 Project designed and drawn So adhere to the 2015 IRC. A2.1 SCALE: 1/4" = 1-0" 2q -n - csmr 3.41 1210'.ts. r— —P- 1 1 T TV T I Li I:.et Office (2) layers of 5/8' Type 'X' drywall - take up to underside of roof sheathing (2) layers of 5/8" Type 'X' drywall - take up to underside of roof sheathing (2) layers of 5/W Type 'X' drywall - take up to underside of roof sheathing 9'-5' 3'-9' I 9' Sl! - Y l..a ndry M s w• w Bench Cubbies2 L UPPER LEVEL Scale: 1/4" = 1'-0" * ALL WINDOWS / EXT. DOORS TO BE U .35 OR BETTER CW V )z W cip U 0 01Eal `L)) Wa F1 a N N ci 4 cAit U DRAWING I�ctlr DRC SUBMITTAL 04-29-19 DRC UPDATE 05-21-19 DRC UPDATE 05-30-19 DRC UPDATE 06-19-19 PERMIT SET 07-19-19 Project desly0ed and drawn to adhere So tht 2015 IRC - A2.2 SCALE: 1/4" = 1'-0" BEAM HALLWAY HALLWAY (2) layers of 518" Type'X' drywall GARAGE OFFIC GBP =1 LAUNDRY (2) layerspf 5/8"— Type'X' drywall GARAGE ■.■ ■.■ ■E■ 111 111 111 221 Larkspur Ln. Cerise Ranch DRAWING JSSUE DRC SUBMITTAL 04-29-19 DRC UPDATE 05-21-19 DRC UPDATE 05-30-19 DRC UPDATE 06-18-19 PERMIT SET 07-19-19 Project designed and drawn to adhere to the 2015 IRC. A4.1 NV1d JNIWt Id JIV1S'S NOlIVONflOd 1 r s a•_s v� - 62'-11 VS' A is D n � 5 0 0 171 D m I CO CID I1 -n >; » z O z Q3INITJd 31VQ 7. 'ON 1.73r0?Jd -Roy rHPCo C-9 04 O trl d O <xd X10 T1 tri GASAS/KUBLER RESIDENCE P IF THE ABOVE DIMENSION DOES NOT MEASURE ONE INCH (1 ) EXACTLY, THIS DRAWING WILL HAVE BEEN ENLARGED OR REDUCED.AFFECTING ALL LABELED SCALES. 221 Larkspur Lane Carbondale, CO 81623 Cerise Ranch Carbondale, Colorado Garfield County PHONE: 847-804-0265 Ekkehard PHONE: 847-217-0265 Laurie EMAIL: #Client E-mail 36" (H) GUARDRAIL AVB. DESIGN BY MANE. TO MEET R312 & SECT. 1607.8 2015 TBC; SEE 5.0.01 CANT. BEAM END 2x8 RIM BOARD• TYP Y L•-10' 4441 lir SIMPSON HU612 HANGER - GL CANT.LECCORS. SIMPSON H3 TIE DOWN @ EACH DECK JOIST; ALT. (2) 8d GALV. TOE NAIL EACH SIDE OF DECK JOIST 111 602 DF.#2 REATED TIMBER IJ BFMW CONTINUOUS (1 I IIS 8x12 DF.#2 TREATED TIMBER BEAM Iq I hh�:g0'C 66 �ue*81 i BEo 1 I III 111 ii! :aI 'll 6812 DF.#2 TREATECI i 1 TIMBER BEAM . —'1I1 jI 61 „I 111 1 (3) 2xA RIM BOARD ATTACHED TO DECK JOIST W/ (2) SIMPSON SDW 22 300 SCREWS @ 16" 0/C EACH LAVER (3) 6 6 DF.#2 TREATED TIMBER COLUMN CANE BEAM END SIMPSON LUS 24 FMH (0 EACH DECK JOIST (2) 208 DF.#2 REATED TIMBER LEDGER CONTINUOUS; ATTACHED TO EXG, RIM BOARD OR WOOD FRAMING SUBSTRATE W/ (3) ROWS SIMPSON SDW 22 300 SCREWS g 16. OIC THROUGH EACH LEDGER LAVER (3) BF24 BIGFOOT FOUNDATION SIMPSON HU612 HANGER TWO STORY WOOD & STUCCO FRAME HOUSE 221 LARKSPUR DRIVE L' -r EXG. V1/000 BRG. COLUMN ABV. 11 II II I1 II II fi r1 t Il 1 I1 II 11 II II II I.I II II I \ EXG, DOWN SET BEAM IN GARAGE CEILING ABV. WRAP VENEER AROUND STAIR WALL t� [I y 1P I r 1 I GARAGE II 1 11 II 1t 1I 1I I r I 1 I 1 ■ ► ■ I ■ I E 1 / ■ / X /\ I 1 1 I ■ II� / ■ 021:NA OF.+? REATEDTWSEHLEOGERCOHONVDU& ATTACNEI3 gEKG. W000 ( Q 16"CVC FRAMING. SUBSTRATE W/ ■ FASSROWS 2 LE AtH OGEAL&V6R R ■ I I 1/ (2) 2x8 DF.#2 TREATED' I TIMBER HEADER 1 I I I NEW STA RS J L � J..t► i ! I (( I I I A( },III 1 1 1 1 1 1 1 1; NA 9uI• CONTINUOUS; ATTACHED TO NEWWOOD *' FRAMING SUBSTRATE W/ (3) ROWS SIMPSON SDW 22 300 SCREWS (d 16" O/C THROUGH EACH LEDGER LAYER • —a 1:34_1113 WI , EXG, GARAGE TO REMAIN 431 2x12 OF.42 REATED TIMBER STRINGER CONTINUOUS; A1TAGIED TO EXG. WOOD FRAMING SUBSTRATE WI (3) ROWS SIMPSON SOW 22300 SCREWS (0 16" 0/C TOW EAC,U_LEDGER LAVELi_ (N) 6x6 DF.#2 TIMBER POST (2)2x0 DF.#2 REATED TIMBER .�J _.2J 2.17D6.'L ATED TLIBE&I$TNBOGER CGJITINUOUS. C IT A)'ACHED 10 NFW WOOOARANINGSV88TRATE WI IS) ROWS SIMPSON SOW 22 300 SCREWS ®16' O/C .S'4• 1 i-6 114• 3 31A �I,•_�•-S.Q THROUGH EACH LEDGER LAVER 23.-1.rI' GL GL 2,6 DF.42 Q18" O/C WOOD FRAME WALL ASPHALT DRIVEWAY PROVIDE HD3B HOLD DOWN EACH SIDE OF GARAGE DOOR OPENING SCHEDULE OF HEADERS CONNECTION SYMBOL HEADER POSTS B DC SIr - - If IL Ifs 1854219 146J - • EACH BIDE OP PF - •• � • ROSE 8'. -TIT. IL 1 ^ 1800682 ,13) •'LVL IT a - 1--_ 2112.Ii1' 'y HD-1 (3) PLY 117/8 LVL (2) 286 JACK POST 51(1) 2,6 TRIMMER (PROVIDE 42) SIMPSON MSTA 18 FLAT HD -2 (3)2x8+ (2) 1/2" PLYWD FLITCH PLATE (2)11/2,51/2 LSL JACK POST @(1)11/2x51/2 L51 TRIMMER (STRAPS BTWN. HEADER &JACKS AT EACH SIDE OF OPENING NEW 206 DF.#2 516" 010 WOOD FRAME WALL - TYP. 12' ROOF OVERHANG- TYP. "Not included in this permit J< GL 2 1 3 1 I 1 - 10 STAIR ROOF, GARAGE ROOF & DECK FRAMING PLAN SCALE; 111• • 0ta. AirZtMirgr., L CALVETI ENGINEERING, INC, CASA5/KUBLER RESIDENCE ILossNi44, wawa var.. same yar 91.11611! RCNP 01..11 Has vats PROJECT NO: DATE PRINTED: 7/16/19 DRAWN BY: X.S. SHEET TITLE STAIR ROOF, GARAGE ROOF B DECK FRAMING PLAN 5.2.02 -= `- 2 il - - �_,514TSCW RI TIE DOWN- Ty I. 21214!2 RDIF RAFTER F 7 w.= 11 dI I w=1) = - 11 _ _ JI ROTI --4E- r i — --.�2I a "� _ _ �� -11 s i B DC SIr - - If IL Ifs 1854219 146J - • EACH BIDE OP PF - •• � • ROSE 8'. -TIT. IL 1 ^ 1800682 ,13) •'LVL IT a - 1--_ 2112.Ii1' 'y ", /41: 1.,' • RIDGE II- -TYR •rf aY• 208D6$2 '• T10010B48- arags IF TYP. o • an 1 IL .• If= 2121)FD405 WAFTER __ r IL=_ SIMPSON H1 TIE DOWN- /-7: J�1 — 12' ROOF OVERHANG- TYP. "Not included in this permit J< GL 2 1 3 1 I 1 - 10 STAIR ROOF, GARAGE ROOF & DECK FRAMING PLAN SCALE; 111• • 0ta. AirZtMirgr., L CALVETI ENGINEERING, INC, CASA5/KUBLER RESIDENCE ILossNi44, wawa var.. same yar 91.11611! RCNP 01..11 Has vats PROJECT NO: DATE PRINTED: 7/16/19 DRAWN BY: X.S. SHEET TITLE STAIR ROOF, GARAGE ROOF B DECK FRAMING PLAN 5.2.02 NEW SHED ROOF ARV. EXG, ROOF PROVIDE HD3B HOLD DOWN EACH SIDE OF GARAGE DOOR OPENING NEW SHED ROOF ABV. NEW ROOF FRAMING NEW GUARDRAILS DESIGNED BY MANFR. 8 11 ROGf FROMMD TOREUAIH - 1 Kitchens T b6 DF 2DCW1J/ 1 4, 1 1 22(10 DF/I2 RIDGE BEAN :i>> eintm 2OO MER Alt Dining n I 11, PROP. 1/2 x 7 PARALLAM PSL BRG. COLUMN FOR ROOF 4 RIDGE BEAM ABV. 4 .1 47i Laundry N A MOVE PARALLAM PSL BRG, COLUMN TO NEW LOCATION AS 1 INDICATED L MBath ' MBR IIICAP 111 . Itt 216 MG DORMER ORM alt O,C 12J2M10 DFM2 RIDGE BEAM A, DM= HEW OVER nutROOF DOCKET ERG. ROOF FRAMING TO RERAN 10 11 SPAY J 2 3 4'# 4'.,B 1/4" y B''4" 1 ],,6 1!4" 1 3•-3/4" } 23'"10"1 r {7! 20 DF.#2 RIDGE BEAM NEW ROOF RIDGE LINE TO MATCH EXG. ROOF RIDGE ABV. KITCHEN & DINING (2)16. LVL RIDGE BEAM 11 7/0 LSL RIM W/ 11 7/8 TJI ROOF RAFTER ALT. NEW DORMER ROOF 2x6 DF.#2 RIM BOARD ALONG PERIMETER OF ROOF - TYP. GABLE END WALL & ROOF FRAMING GABLE END WALL & ROOF FRAMING ROOF FRAMING PLAN Azspzu_crAmm CALVETTI ENGINEERING, INC. •/ELSA�... CA5A5/KUBLER RESIDENCE INw Moo 07333 88 r 0,8 me 6TIIpi10 �0.1P SW( PROJECT NO: DATE PRINTED: 7/16/19 DRAWN 13Y: X.& SHEET TITLE ROOF FRAMING FLAN 5.2.0 3 Dave Argo From: Dave Argo Sent: Tuesday, August 20, 2019 7:50 AM To: 'Kurt Carruth' Cc: Andy Schwaller (aschwaller@garfield-county.com) Subject: RE: [External] Re: Casas ADU - Permit #BLRE-07-19-5868 Kurt: I've looked over your proposed drawing revisions and believe that everything looks good with one exception: the front and back walls of the garage — which support the floor above — are also required to have a one-hour fire rating too (see R302.3.1 including Figure R302.3.1). Similar to the underside of garage ceiling, we will accept (2) layers of 5/8" Type X drywall in existing buildings in lieu of a U.L. listed assembly which is required for new construction. Please provide us with (2) full-size copies of all revised sheets & if you can submit this to us yet this week that would be preferable, as I will be out of the office the following 2 weeks. Thanks, Dave Argo Plans Examiner CGarfield C'ouri► Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 81601 Tel: 970-945-8212 Ext. 1610 Email: dargo@garfield-county.com Web: garfield-county.com From: Kurt Carruth [mailto:kurt@hinge-architects.com] Sent: Monday, August 19, 2019 10:55 AM To: Dave Argo <dargo@garfield-county.com> Subject: [External] Re: Casas ADU - Permit #BLRE-07-19-5868 On Thu, Aug 15, 2019 at 4:04 PM Dave Argo <dargoa7garfield-eounty.eom> wrote: Kurt: Thanks for your timely reply. All good with items #1 — 3. Maybe when the Structural drawings are resubmitted the future garage can be deleted from those 2 sheets? I crossed them out and added a note that it was not part of this permit. The engineer's draftsperson is out of town for like a week, and I need to keep it all moving - if possible. Let me know if you absolutely need it removed. In regard to item #4, fire separation between dwelling units needs to be clearly illustrated (floor plans, sections and/or details). Narrative specifications may suffice in lieu of details at garage supporting walls and underside of floor 1 assembly. l updated the sections with notes and callouts as to where the two layers of type "X" is to be located. PIs. review and get back to me that this works. But I think we need to see a wall section/detail at the party wall between units at upper level since it needs to extend up to the underside of the upper roof sheathing. The point is to provide the builder (not just the Building Dept.) enough information so that they can get it built right. Dave Argo Plans Examiner CGarfield County Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 81601 Tel: 970-945-8212 Ext. 1610 Email: dargo@garfield-county.com Web: Garfield-county.com 2 Dave Argo From: Dave Argo Sent: Wednesday, October 9, 2019 8:08 AM To: 'Kurt Carruth' Subject: RE: Casas ADU - Permit #BLRE-07-19-5868 Attachments: 2 -Family Supporting Construction Reqts..pdf Kurt: Sorry for not getting back to you sooner, but have been in and out of the office the past few days. Yes, the building code requires that supporting wall construction also be fire -rated (see attached PDF taken from 2015 IRC Code & Commentary). Dave Argo Plans Examiner C_ Garfield County Community Development Department 108 8th Street, Suite 401 Glenwood Springs, CO 81601 Tel: 970-945-8212 Ext. 1610 Email: dargo@garfield-county.com Web: garfield-county.com From: Kurt Carruth [mailto:kurt@hinge-architects.com] Sent: Friday, October 4, 2019 1:37 PM To: Dave Argo <dargo@garfield-county.com> Subject: [External] Fwd: Casas ADU - Permit #BLRE-07-19-5868 Dave: Do the lower level (existing) garage / house interior walls need 2 layers of drywall or just the lid? The contractor is saying that he has never had to do the walls. Thanks - Kurt Carruth, architect hingeARCHITECTS, Ltd. 812 grand avenue, ste. 201 gws, co. 81601 c:970-309-4432 vr w w. h inge-a i tects.c o m Forwarded message From: Kurt Carruth <kurt@hinge-architects.com> Date: Mon, Aug 19, 2019 at 10:41 AM 1 Dave Argo From: Dave Argo Sent: Wednesday, November 6, 2019 8:35 AM To: Kurt Carruth Cc: Andy Schwaller (aschwaller@garfield-county.com) Subject: FW: [External] Fwd: 221 larkspur Attachments: PD-10-10A_new_IThugCt.pdf; 5u5_PD-40-40A.pdf Kurt: The building code requirements (which I sent to you previously) are very clear that supporting construction — in this case bearing walls below the one-hour fire rated ceiling — need to comply with a one-hour construction assembly. The information you have sent over for our review is unclear as to how this painted material will be used to achieve the one-hour fire rating. For example, will it cover the entirety of the existing single layer of drywall? Or will it only be applied to wall surface areas that are currently exposed to view? (i.e., will not extend behind existing cabinets because it's "inconvenient" to remove them?) ... if that's the case it is not acceptable, because it does not provide fire separation as intended by the Building Code. In order for the Building Department to approve this alternative to the previously approved (2) layers of 5/8" Type X drywall — as currently shown on approved plans — we need to receive detailed application instructions from the Manufacturer (or local representative) that clearly describe the specific application and just exactly how this material will actually achieve the equivalent of a one-hour fire rated assembly. We also will require that this material is applied by a Manufacturer's certified applicator. Please provide us with additional information specifying or otherwise detailing the proposed application methods including extents of coverage, as well as assurance from the Manufacturer that the use of this material on this project will indeed result in a one-hour fire rated assembly. *FYI: Beginning on Monday, I will be out of the office on extended medical leave following surgery, so it will probably be Andy that you will need to finalize this issue with. Dave Argo Plans Examiner :. Garfield Cour< v I Community Development Department 108 80 Street, Suite 401 Glenwood Springs, CO 81601 Tel: 970-945-8212 Ext. 1610 Email: dargo@garfield-county.com Web: garfield-county.com From: Kurt Carruth <kurt@hinge-architects.com> Sent: Monday, November 4, 2019 3:05 PM To: Andy Schwaller <aschwaller@garfield-countv.com> Subject: [External] Fwd: 221 larkspur Hi Andy: 1 Sorry to bug you, but I am running into a problem with an ADU finish out in Cerise Ranch. The ADU space was existing, and being used as a heated storage space. It is over an existing Garage. In the Garage, we have a double layer of Drywall on the garage lid, but the walls have a single layer. The plans examiner said that we now have to add two layers of drywall to the walls as well for fire ratings. We have a laundry room with extensive cabinetry and a mechanical equipment area in Garage that would have to be removed to add the second layer of drywall - which was not expected - and to considerable expense to my clients. My contractor, Dave Cardiff, came up with an option of a fire proofing paint. Have you seen this before? Any chance this could be approved? (Paint specs. below). Please advise. Thanks - Kurt Carruth, architect hine ARCHITECTS, Ltd. 812 grand avenue, ste. 201 gws, co. 81601 c:970-309-4432 www.hinge-archRects.com Forwarded message From: Blake Fish <Blake.Fish@sherwin.com> Date: Wed, Oct 30, 2019, 9:04 AM Subject: Intumescent Paint and Topcoat To:<DrellanapaintingincPgmail.com> Melvin, 10-10 intumescent • 7 mils wet 2 coats = 1 hour rating 40-40 intumescent • Topcoat Thanks, Blake Fish The Sherwin-Williams Co. Sales Representative Glenwood Springs / Aspen (C) 970-948-1534 2