HomeMy WebLinkAboutCorrespondenceDave Argo
From: Dave Argo
Sent: Monday, December 11, 2017 4:51 PM
To: 'rrockwell@gmail.com'
Subject: Derek Haft - Amended Plans Permit # BLRE-02-16-4041
Randy:
I am looking over the amended plans for Derek Haft's residence located on County Road 102 and have a few questions
before we can approve these revisions:
a. Root Cellar —
• Can you please clarify intended use of this (presumably) fully underground structure? Is it intended to
serve as habitable space or simply as cold storage?
• The invoice from Utah Shelter Systems indicates that this underground structure will be contain bunk
beds, a kitchen and graywater plumbing system. These items cannot be included without first obtaining
a Land Use Change Permit for an Accessory Dwelling Unit on this property, and graywater plumbing
systems are presently not allowed in the State of Colorado.
• Can you explain how access from the residence is provided to the root cellar? Is it similar to a crawl
space access located below the main level floor? ... Is it accessed by ladder or is there a stair?
• Will the root cellar be insulated?
b. Conex Structure —
• We assume that this unit is fully buried below grade ... is that correct?
• Is it intended to serve as habitable space or simply as cold storage?
• Please clarify access to this structure (provided only from hatch above, or is there also an exterior on -
grade access? — located at the 90 degree elbow turn)
c. Storage Shed above Conex Structure —
• We also understand that the Conex structure may presently have a "Tuff Shed" or "Moore Storage"
structure located above it. If that's the case, please confirm that size of this shed is less than 200 square
feet in size, otherwise it may require a building permit.
Please clarify these items so that we may finalize our review of these amended plans.
Thanks for your assistance —
Dave Argo
Plans Examiner
C'\,
. Garfwld 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
CONFIDENTIALITY NOTICE: This email communication and any files transmitted along with it are intended only for the person or entity to which it is
addressed. If you have received this email in error, please immediately notify the sender by email and delete it from your files.
1
Dave Argo
From: derrek haft <boundbygravity@hotmail.com>
Sent: Tuesday, December 12, 2017 6:34 PM
To: Randal Rockwell
Cc: Dave Argo
Subject: Derrek Haft - Amended Plans Permit # BLRE-02-16-4041
Attachments: Root cellar kitchen jpg
Dave,
hope this answers all your questions.
Root Cellar
- The root cellar purchased from Utah Shelter Systems is not set up to be a habitable space. When it was
delivered, it did arrive with bunk beds, but I exchanged them for a couch and table before it was fully
assembled and buried.
- There isn't a gray water system installed. The structure comes standard with drains on each end incase of
flooding. A grey water system can be connected to these drains, if it was initially set up for a grey water
system before the structure was buried, and mine wasn't. There is no plumbing installed. The only water
would be stored in 55 gallon drums. The Kitchen consists of a sink cabinet (picture attached) that is
connected to a 55 gallon drum with a hand pump, and drains into a bucket under the sink.
- Access is through a common cellar hatch door in the floor of the storage shipping container above it. It has a
small 30 degree, sloping ladder.
- The root cellar is not insulated.
Conex storage contaner
- The shipping container is not buried. It is fully above grade. The root cellar is the buried structure. The
shipping container is being used as a storage shed, and is on top of the entrance to the root cellar. The hatch
door is accessed inside the conex container.
- The shipping container is cold storage, not a habitable space.
- The shipping container is accessed through its double steel doors.
- There is no shed above the Conex container.
Thanks,
Derrek Haft
(970) 948-3168
1
BUILDING PLANNING
walls that are designed to break away under flood
loads; and
2. Are constructed with insect screening or open lat-
tice; or
3. Are designed to break away or collapse without
causing collapse, displacement or other structural
damage to the elevated portion of the building or
supporting foundation system. Such walls, framing
and connections shall have a resistance of not less
than 10 (479 Pa) and not more than 20 pounds per
square foot (958 Pa) as determined using allowable
stress design; or
4. Where wind loading values of this code exceed 20
pounds per square foot (958 Pa), the construction
documents shall include documentation prepared
and sealed by a registered design professional that:
4.1. The walls and partitions below the design
flood elevation have been designed to col-
lapse from a water load less than that which
would occur during the base flood.
4.2. The elevated portion of the building and sup-
porting foundation system have been
designed to withstand the effects of wind and
flood loads acting simultaneously on struc-
tural and nonstructural building components.
Water -loading values used shall be those
associated with the design flood. Wind -load-
ing values shall be those required by this code.
5. Walls intended to break away under flood loads as
specified in Item 3 or 4 have flood openings that
meet the criteria in Section R322.2.2, Item 2.
6. In Coastal A Zones, walls shall be provided with
flood openings that meet the criteria of Section
R322.2.2.
R322.3.5 Enclosed areas below design flood elevation.
Enclosed areas below the design flood elevation shall be
used solely for parking of vehicles, building access or stor-
age.
R322.3.5.1 Protection of building envelope. An exte-
rior door that meets the requirements of Section R609
shall be installed at the top of stairs that provide access
to the building and that are enclosed with walls
designed to break away in accordance with Section
R322.3.4.
R322.3.6 Construction documents. The construction
documents shall include documentation that is prepared
and sealed by a registered design professional that the
design and methods of construction to be used meet the
applicable criteria of this section.
R322.3.7 Tanks. Underground tanks shall be anchored to
prevent flotation, collapse and lateral movement under
conditions of the base flood. Above -ground tanks shall be
installed at or above the elevation required in Section
R322.3.2. Where elevated on platforms, the platforms
shall be cantilevered from or knee braced to the building
or shall be supported on foundations that conform to the
requirements of Section R322.3.
SECTION R323
STORM SHELTERS
R323.1 General. This section applies to storm shelters where
constructed as separate detached buildings or where con-
structed as safe rooms within buildings for the purpose of
providing refuge from storms that produce high winds, such
as tornados and hurricanes. In addition to other applicable
requirements in this code, storm shelters shall be constructed
in accordance with ICC/NSSA-500.
SECTION 324
SOLAR ENERGY SYSTEMS
R324.1 General. Solar energy systems shall comply with the
provisions of this section.
R324.2 Solar thermal systems. Solar thermal systems shall
be designed and installed in accordance with Chapter 23 and
the International Fire Code.
R324.3 Photovoltaic systems. Photovoltaic systems shall be
designed and installed in accordance with Sections R324.3.1
through R324.7.2.5 and NFPA 70. Inverters shall be listed and
labeled in accordance with UL 1741. Systems connected to the
utility grid shall use inverters listed for utility interaction.
R324.3.1 Equipment listings. Photovoltaic panels and
modules shall be listed and labeled in accordance with UL
1703.
R324.4 Rooftop -mounted photovoltaic systems. Rooftop -
mounted photovoltaic panel systems installed on or above the
roof covering shall be designed and installed in accordance
with Section R907.
R324.4.1 Roof live load. Roof structures that provide sup-
port for photovoltaic panel systems shall be designed for
applicable roof live load. The design of roof structures
need not include roof live load in the areas covered by
photovoltaic panel systems. Portions of roof structures not
covered by photovoltaic panels shall be designed for roof
live load. Roof structures that provide support for photo-
voltaic panel systems shall be designed for live load, LR,
for the load case where the photovoltaic panel system is
not present.
R324.5 Building -integrated photovoltaic systems. Build-
ing -integrated photovoltaic systems that serve as roof cover-
ings shall be designed and installed in accordance with
Section R905.
R324.5.1 Photovoltaic shingles. Photovoltaic shingles
shall comply with Section R905.16.
R324.6 Ground -mounted photovoltaic systems. Ground -
mounted photovoltaic systems shall be designed and in-
stalled in accordance with Section R301.
R324.6.1 Fire separation distances. Ground -mounted
photovoltaic systems shall be subject to the fire separation
distance requirements determined by the local jurisdic-
tion.
76 2015 INTERNATIONAL RESIDENTIAL CODE®
Highlights of ICC 500-2014, ICC/NSSA Standard for the Design and Construction
of Storm Shelters
Published by the International Code Council (ICC), ICC/NSSA
Standard for the Design and Construction of Storm Shelters
(ICC 500), is a referenced standard in the International Codes (I -
Codes). The ICC, in partnership with the National Storm Shelter
Association (NSSA), formed a national committee in 2003 that
developed and released a consensus standard to codify the design
and construction requirements of tornado and hurricane storm
shelters. The ICC 500 was first published in the summer of 2008
and updated in 2014. ICC 500 provides the minimum
requirements to safeguard public health, safety, and general
welfare relative to the design, construction, and installation of
storm shelters constructed for protection from high winds
associated with tornadoes and hurricanes. This standard is
intended for adoption by government agencies and organizations
for use in conjunction with model codes to achieve uniformity in
the technical design and construction of storm shelters.
ICC 500 applies to the design, construction, installation, and inspection of both residential and community
storm shelters. Residential storm shelters serve occupants of dwelling units and have an occupant capacity
not exceeding 16 people. Community storm shelters are storm shelters that are not residential storm shelters.
Storm shelters are permitted to be either separate, detached buildings, or enclosed or partially enclosed
within a host building.
ICC 500 is referenced in the 2009, 2012, and 2015 editions of the ICC's International Residential Code
(IRC) and International Building Code (IBC) as the governing standard for the design and construction of
storm shelters. Since 2009, the IRC and IBC have included a section titled "Storm Shelters," which is
Section R323 of the IRC and Section 423 of the IBC. Additionally, the 2015 edition of the IBC Section 423
requires buildings with certain types or functions and geographic locations to be built with a storm shelter.
The following structures must include a storm shelter constructed in accordance with ICC 500 when located
in a 250 mph wind speed zone for tornadoes per Figure 304.2(1) of ICC 500 (refer to Figure 1):
• 911 call stations
• Emergency operations centers
• Fire, rescue, and ambulance stations
• Police stations
• K-12 school buildings with a capacity of 50 or more occupants, with certain exceptions
ICC 500-2014
ICC/NSSA StmuinY4
tor the [lesion owl
I;anstneeina of Swim
Shelters
■
Highlights of ICC 500-2014, September 2015 1
N▪ otes:
1 Values we norrxnat Iliree•second gust wild speeds in miles per hour
al 33 feel above ground for Exposure Category C
2 Multiply miles per hour by 0 44710 obtain malars per second.
Source: ]CC 500, Figure 304.2(1) used with permission
Figure 1: Shelter design wind speeds for tornadoes
j130 MPH
160 MPH
200 MPH
250 MPH
American Samoa 200 mph
Guam 250 mph
Hawaii 160 mph
Puerto Rico 200 mph
Virgin Islands 200 mph
ICC 500 sets forth requirements for a range of topics related to the design and construction of storm shelters,
including administrative items, structural design criteria, siting requirements, occupancy and egress
requirements, essential features, and test methods for impact and pressure testing. Highlights of ICC 500
(2014 edition) are described below.
Administration and Oversight
• ICC 500 includes provisions for peer review and special inspection, structural observations
during construction, quality assurance plans, and contractor responsibilities. The standard also
specifies the information that should be provided on construction documents, which gives
designers a more standardized approach to plan development.
• Labeling requirements are provided, including that labels required on impact -protective
devices must be clear. Signage requirements for storm shelters are also provided.
Structural Design Criteria
• Loads and load combinations in the American Society of Civil Engineers (ASCE) standard
ASCE 7, Minimum Design Loads for Buildings and Other Structures (2010), with
modifications, are used for storm shelter design. Coefficients and factors that are different for
the design of shelters as compared to conventional buildings may include items such as wind
speed, exposure category, directionality factor, and enclosure classification. These
Highlights of ICC 500-2014 2
modifications are provided in ICC 500 for the designer to use in the load determination
process as defined by ASCE 7-10. Additionally ICC 500 also covers rain loads, roof live loads,
and flood loads requirements that differ from those found in ASCE 7.
• Requirements for the connections between a storm shelter and its host building are also
defined. If the host building is destroyed, the storm shelter must be able to resist any loads that
could be transmitted through connections between the host building and the shelter, in addition
to the full wind loads on the shelter.
• Changes in internal pressures due to atmospheric pressure change must be considered for
tornado shelters.
• Wind-borne debris hazards are defined with representative test missiles for both tornadoes and
hurricanes. The standard defines when component design and testing is required, what the size
and speed of the missile must be, and the type of pressure testing required.
• Foundations and slabs that support a storm shelter must be designed for all applicable loads in
accordance with ICC 500. Minimum requirements for slabs -on -grade are provided. Slabs shall
have a minimum thickness of 31/2 inches with a minimum of 6 x 6, W1.4 x W1.4 welded wire
reinforcement or No. 4 bars spaced at a maximum of 18 inches on center in two perpendicular
directions and must have the capacity to resist all applicable loads.
Siting and Flood Criteria
• Minimum floor elevation requirements based on flood hazards are provided.
• Siting requirements include proximity to hazardous materials, travel distance, and high-risk
flood hazard areas. Residential shelters should be located a maximum travel distance of 150
feet from an exterior door of the residence that the shelter is intended to serve.
Occupancy, Means of Egress, and Access
• Minimum required usable shelter floor area is specified in square feet per occupant. Designers
must determine occupant load using the minimum usable area per occupant in conjunction
with the total usable area, which is calculated by reducing unusable area from gross floor area.
• Provisions for number of doors, emergency escape openings, stair specifications, and locks
and latching are provided, among other items.
Fire Protection, Essential Features, and Accessories
• The standard provides requirements on fire resistant construction and fire extinguishers.
Community storm shelters must have a 2 -hour fire resistance rating for any fire barriers and
horizontal assemblies separating spaces between the storm shelter and host building.
• Ventilation, both mechanical and natural, is covered for tornado and hurricane storm shelters.
Tornado storm shelters must have at least natural ventilation, while hurricane storm shelters
must have mechanical ventilation if they have an occupant capacity greater than 50.
• Other requirements, such as emergency lighting, standby lighting, and standby power, are also
covered in the standard. Power for critical systems (such as mechanical ventilation) must be
protected to the same level as the storm shelter.
Highlights of ICC 500-2014 3
• The section on sanitation requirements includes tables showing the number of required hand -
washing and toilet facilities for both hurricane and tornado storm shelters.
Test Methods
• The standard specifies testing requirements on storm shelters and components for both missile
impact (wind-borne debris) and wind pressure.
Significant Changes in the 2014 Edition of ICC 500
The 2014 edition of ICC 500 significantly increases the level of quality control and quality assurance
required for the design and construction of storm shelters. The 2008 edition of ICC 500 required that peer
reviews of storm shelters be performed only for storm shelters designed for more than 300 occupants. The
2014 edition of ICC 500 requires a peer review to be conducted for community storm shelters protecting 50
occupants or more, Ciroup E classified structures with more than 16 occupants, and shelters in Risk Category
IV structures. Additionally, a peer review report must be submitted to the Authority Having Jurisdiction, in
conjunction with the construction documents, during permit review.
ICC 500-2014 has special inspection requirements for post -installed anchors (anchors installed in masonry or
concrete that has already hardened) and foundation elements. Post -installed anchor capacities are highly
dependent on the installation; therefore, the anchor installation and capacity must be verified and certified.
To ensure a complete load path from roof to ground, special inspections are now required to verify the
adequacy of the foundation slab to transfer loads from the storm shelter to the subgrade below. The
requirements for design information to be provided on the construction documents have also been expanded
in ICC 500-2014.
ICC 500-2008 required construction documents to include details for Main Wind Force Resisting System
(MWFRS) connections to the roof and foundation, and wall connections to the roof and foundation. ICC
500-2014 goes further to specify that construction documents must include details on wall cladding and wall
cladding connections, foundation design and capacity, and shelter installation methods, including anchor
locations and minimum required capacity of each anchor. These additional details will help peer reviewers
and the Authority Having Jurisdiction verify that a proper load path exists that can withstand the extreme
forces storm shelters may encounter.
ICC 500-2014 clarifies provisions that account for the effects imposed by a structure that encloses the storm
shelter or by neighboring structures that may shield/connect to the storm shelter. If the storm shelter is
enclosed inside a host structure, the storm shelter must be designed to resist the loads that would be
generated if the surrounding structure collapsed. If components of the host building structurally connect to
the storm shelter, the storm shelter must be designed to resist the maximum load that could be transferred by
the connection simultaneously with all loads imposed on the shelter assuming it is fully exposed.
The list below provides a brief representation of the most significant changes by chapter.
CHAPTER 1 APPLICATION AND ADMINISTRATION
• Section 106.1.1 Peer review: A peer review shall be conducted by an independent registered
design professional for compliance with llie requirements of Chapters 3, 5, 6, and 7 for
Highlights of ICC 500-2014 4
community shelters with an occupant load greater than 50 people, storm shelters in elementary
schools, secondary schools, and day care facilities with an occupant load greater than 16 people,
and for storm shelters in Risk Category IV (essential facilities) as defined in Table 1604.5 in the
IBC. ICC 500-2008 required peer review only for storm shelters with an occupant load greater
than 300 people, and only for requirements in Chapter 3. Conducting peer reviews on safe rooms
will allow inadequacies in the design to be found and resolved, resulting in improved
performance.
• Section 106.1.2 Peer review report: A signed and sealed report, fully describing the items
reviewed, their compliance or non-compliance with applicable codes and standards, and
recommendation of acceptance or rejection of the storm shelter design, or modifications to
render the design acceptable, shall be submitted to the Authority Having Jurisdiction prior to
issuance of a permit for construction. ICC 500-2008 did not require a peer review report. The
peer review report confirms in writing that the peer review was performed and that any design
issues were resolved.
• 106.3.1 Special inspection to verify anchor installation: A special inspection shall be provided
to verify the post -installed anchor installation and capacity in accordance with Section 107.2.1.
For post -installed anchorage to foundations, a special inspection shall be provided to verify
foundation adequacy in accordance with Section 107.2.1 and 308. ICC 500-2008 did not require
a special inspection of post -installed anchors or verification of the adequacy of the foundation.
Verifying anchor and foundation capacity will ensure there is a continuous load path to anchor
the storm shelter.
• Section 107.2.1 Design information: Under ICC 500-2014, additional design information is
required to be included in the construction documents to improve the information provided to
reviewers or the Authority Having Jurisdiction. The additional information allows for easier
confirmation that the proper design loading and criteria were used for the design of the storm
shelter. The following additional design information is required to be included with the
construction documents:
• A storm shelter section or elevation showing the height of the storm shelter relative to
the finished grade, finished floor, and host building, where applicable.
• For community shelters, calculations for the number of sanitation facilities.
• Minimum foundation capacity requirements.
• Shelter installation requirements including anchor locations and minimum required
capacity for each anchor.
X. For hurricane shelters, the rainfall rate of the roof primary drainage system.
For hurricane shelters, the rainfall rate of the roof secondary (overflow) drainage system,
where required.
For hurricane shelters, the rainwater drainage design rainfall rate for facilities subject to
rainwater impoundment.
Highlights of ICC 500-2014 5
The ICC 500-2008 requirement to indicate the importance factor has been removed because
wind pressure is calculated using ASCE 7-10, which no longer uses importance factors.
• Section 107.3.1 Detailed requirements: Under ICC 500-2014, additional detailed requirements
for quality assurance plans must be included in the construction documents for community
shelters in an effort to improve the load path performance. The following have been added to the
list of detailed requirements for quality assurance plans:
• Foundation design.
• Pre -fabricated shelter installation requirements including anchor locations and minimum
required capacity for each anchor.
• Pre -fabricated shelter minimum foundation capacity requirements.
Ensuring that the listed details are part of the quality assurance plan in the construction
documents will help reviewers verify that a proper load path is provided from roof to foundation.
• Section 107.3.3 Contractor responsibility: The requirements of a contractor's responsibility
are clarified. Before beginning work on the MWFRS or components listed in the quality
assurance plan, each contractor responsible for the construction, fabrication, or installation must
submit a written statement of responsibility to the Authority Having Jurisdiction, the responsible
design professional, and the owner. This statement acknowledges awareness of special
inspection requirements, compliance with the construction documents, and the quality assurance
plan.
• Section 108.2 Labeling: Permanent labels that denote compliance with ICC 500-2014 must now
be applied to impact -protective systems.
CHAPTER 3 STRUCTURAL DESIGN CRITERIA
The 2011 Edition of ICC 500 is now consistent with ASCE 7-10, including items such as load
combinations, removal of importance factor, and terminology (e.g., "impact -protective systems" rather
than "opening protective devices").
• Section 301.1.2 Anchor calculations for doors, windows, and shutters (Section 306.6 states
similar criteria): Where anchorage of door, window, or shutter framing to the shelter structure
is required by means other than those provided in the manufacturer's listing or installation
instructions in accordance with Section 107, alternate anchorage shall be designed for pull-out
and shear, and the anchor placement detailed in accordance with accepted engineering practice.
The alternate anchorage details and calculations shall be provided as part of the construction
documents. ICC 500-2008 did not discuss anchorage requirements or require that any additional
information on the design of anchors be provided. These requirements will help ensure that a
proper load path is provided for doors, windows, and shutters.
• Section 302.1 Strength design (ASCE 7-10): For strength design or load and resistance factor
design (LRFD), the load combinations are now as stated in ASCE 7, Section 2.3, using loads as
determined in accordance with Section 304 of this standard. Exception 1 to ASCE 7 Section
2.3.2 is still not allowed.
Highlights of ICC 500-2014 6
• Section 302.2 Allowable stress design (ASCE 7-10): For allowable stress design (ASD), the
load combinations are now as stated in ASCE 7, Section 2.4, using loads as determined in
accordance with Section 304 of this standard.
• Section 303.1.1 Rainfall rate: The rainfall rate for determination of rain loads on the roof of a
hurricane shelter shall be determined by adding 6 inches (152.4 mm) of rainfall per hour to the
rainfall rate established from Figure 303.2. The purpose of the revision was to increase the
design rainfall rate to approximate a 10,000 -year recurrence interval, which is also used for wind
speed. The 2008 edition of ICC 500 required that a rainfall rate of 3 inches per hour be added to
the rate established in Figure 303.2.
• Section 303.4 Flood loads: Flood loads shall be determined in accordance with ASCE 7-10. The
design flood elevation shall equal the minimum floor elevation as specified in Section 401 of this
standard. ICC 500-2008 did not specify flood loading criteria.
• Section 304.1 General: Wind loads are allowed to be determined by any of the several
applicable methods in ASCE 7-10, including the wind tunnel method. ICC 500-2008 prescribed
use of the Method 2 Analytical Procedure in ASCE 7-05 (renamed the Directional Method in
ASCE 7-10).
• Section 304.2 Design wind speed: The hurricane shelter design wind speed map, Figure
304.2(2) of ICC 500 (refer to Figure 2 below), has been updated using the same hurricane
simulation method as in ASCE 7-10. The mean recurrence interval is 10,000 years (0.5 %
probability of exceedance in 50 years), unchanged from ICC 500-2008. Wind speeds on the new
hurricane shelter design wind speed map are slightly lower than those in the 2008 edition. The
tornado shelter design wind speed map is unchanged and is shown above in Figure 1.
Highlights of ICC 500-2014 7
z
Q
O
780
180
180
180
;ozft• 10
180
Note■ 190
1 Values are nominal three.seoone gull enno speeds in mills 20
per hour al 39 Apel above ground M. E.posure Category C 210
80 2 liMu urarrp 1utern De Wein tenkura i. parovtud
3 I0Ln4ele.1 eelNaI aYaa MIA* the IFF Whleur thee use ere 220
r*eV) teat rap/W cenur lfai She mmeatal e
So 4 Pealtat roves pm Flow be 0 401 ailWn rwwa per YLerq
Location V
Hawaii 165
Puerto Rico 200
Guam 235
Virgin Islands 190
too•ao-w
Source: ICC 500, Figure 304.2(2) used with permission
Figure 2: Shelter design wind speeds for Hurricanes
• Section 304.4 Exposure category: For hurricane shelters, use of Exposure Category 13 tor the
MWFRS is not permitted unless the following exception exists: Exposure Category B exists for
all wind directions and is likely to remain Exposure Category B after a hurricane having wind
speeds as great as those in Figure 2. ICC 500-2008 permitted the use of Exposure Category B for
hurricane storm shelter MWFRS, but without considering possible changes in exposure due to
damage during the storm. Additionally, it should be noted that the reintroduction of Exposure D
in hurricane prone regions in ASCE 7-10 is carried through to ICC 500 (Exposure D did not
exist in hurricane prone regions in ASCE 7-05, or by reference in ICC 500-2008).
• Section 304.8 Shielding of storm shelters by host and adjacent buildings: Storm shelters
enclosed in, partially enclosed in, or adjacent to host buildings, or adjacent to other buildings not
designed for the load requirements of Chapter 3, shall be designed considering the host building
to be destroyed and the shelter to be fully exposed. ICC 500-2008 did not have any requirements
on how to account for the shielding of storm shelters by the host structure or adjacent structures.
• Section 304.9 Storm shelter connected to host buildings: Where an element or component of
the host building is connected to a storm shelter, the storm shelter shall also be designed to resist
Highlights of ICC 500-2014 8
the maximum force that could be transmitted to the shelter equal to the ultimate failure strength
of the connection or element being connected, whichever is lower, concurrent with the other
wind loads on the storm shelter required by Chapter 3. This section replaces and clarifies the
provisions in ICC 500-2008 Section 308.1.1.
• Section 305.1.2 Missile criteria for hurricane shelters: The speed of the test missile impacting
vertical shelter surfaces shall be a minimum of 0.50 times the shelter design wind speed. The
2008 edition of ICC 500 directed that the speed of the test missile impacting vertical shelter
surfaces shall be a minimum of 0.40 times the shelter design wind speed. This modification
represents a more conservative approach, which is more consistent with post -storm observations
of debris impacts during hurricane events and recent research on the aerodynamics of wind-
borne debris.
• Section 306.7 Door undercut: Door or shutter assemblies for use in the shelter envelope with a
threshold at the level of exit discharge shall be limited to a' -inch maximum undercut. A
weather seal at the door undercut where doors are exposed to weather shall be provided. ICC
500-2008 did not have any requirements on door undercuts.
• Section 306.8 Joints, gaps, or voids in shelter envelope: Joints, gaps, or voids in the shelter
envelope that open into the protected occupant area similar to masonry control joints, expansions
joints, opening protective device shim spaces, air louver blades, grates, grilles, screens, or pre-
cast panel joints shall be considered openings and shall be protected in accordance with Sections
306.3 and 306.4. Masonry control joints, masonry or concrete expansion joints, or precast
concrete panel joints %-inch or less in width shall be sealed with joint material that is in
accordance with TMS 602 for masonry or ASTM C920 for concrete. Additionally, joints, gaps,
or voids that do not allow a direct debris path through the shelter envelope into the protected
occupant area are not required to be protected. ICC 500-2008 did not have any requirements on
joints, gaps, or voids in the shelter envelope other than those required for systems and utilities.
CHAPTER 4 SITING
• Section 401.1.1 Minimum floor elevation of community shelters and Section 401.1.2
Minimum floor elevation of residential shelters: Text was extensively revised to clarify the
minimum floor elevations of community and residential storm shelters for flood hazards.
• Section 403.1 Residential shelter siting: ICC 500-2014 has added clarification that residential
storm shelters are to be located so that the maximum travel distance along one path from the
residence to the storm shelter is 150 feet. ICC 500-2008 specified a 150 -foot radius.
• Section 404.1 Community shelter siting: ICC 500-2014 specifies that community shelters are
not permitted to be sited in floodways or flood hazard areas subject to high velocity wave action
(Zone V). ICC 500-2008 did not address shelter siting with respect to flood hazards.
CHAPTER 5 OCCUPANCY, MEANS OF EGRESS, ACCESS AND ACCESSIBILITY
• Section 501.2 Number of doors: ICC 500-2014 provides an exception stating that shelters
having an occupant load of 16 or less are not required to have an emergency escape opening.
Highlights of ICC 500-2014 9
CHAPTER 7 SHELTER ESSENTIAL, FEATURES AND ACCESSORIES
• Section 702.1.1.1 Location of ventilation: ICC 500-2014 specifics that the lower and upper
openings shall be horizontally located on an opposite wall or roof surface to cross -ventilate the
shelter. The location of ventilation openings in storm shelter walls was not stated in the 2008
edition.
• Section 703.8 Rainwater drainage for hurricane shelter facilities: ICC 500-2014 specifies
that primary roof drainage systems shall be designed to drain a rainfall rate of 3 inches more than
the rate established in Figure 303.2. Secondary roof drainage systems shall be designed to drain
a rainfall rate of 6 inches more than the rate established in Figure 303.2. Rainwater drainage for
the site must be provided by adding 6 inches per hour to the rainfall rate from the rate established
in Figure 303.2 to prevent flooding of occupied areas, critical support systems, and access routes.
The 2008 edition did not address design of the drainage system.
CHAPTER 8 TEST METHODS FOR IMPACT AND PRESSURE TESTING
• Section 803.1 Test assembly: ICC 500-2014 specifies that the tests for doors, windows, and
impact -protective systems shall be performed on the maximum and minimum size listed for use.
The 2008 edition required that testing be performed only on the maximum size listed for use.
• Section 806.4.1 Window assemblies and other glazed openings for tornado shelters: ICC
500-2014 requires the static test pressure to be 1.2 times the design wind pressure. This
modification corrects a typographical error in ICC 500-2008, where the 1.2 factor had been left
out.
REFERENCES
• ASCE (American Society of Civil Engineers) 7-10.2010. Minimum Design Loads for Buildings
and Other Structures. ASCE/SEI 7-10. American Society of Civil Engineers. Reston, VA.
• ASCE (American Society of Civil Engineers) 7-05. 2005. Minimum Design Loads for Buildings
and Other Structures. ASCE/SEI 7-05. American Society of Civil Engineers. Reston, VA.
• ICC (International Code Council). 2014. Standard on the Design and Construction of Strom
Shelters. International Code Council & National Strom Shelter Association. ICC 500. Country
Club Hills, IL
• ICC (International Code Council). 2008. Standard on the Design and Construction of Strom
Shelters. International Code Council & National Strom Shelter Association. ICC 500. Country
Club Hills, IL
Prepared by FEMA Building Science Branch. Content from ICC 500-2014 used with permission from
ICC. Purchase ICC 500 at www.iccsafe.org.
Highlights of ICC 500-2014 10