HomeMy WebLinkAboutEngineer's Design Report 02.02.2017 & Conditions of PermitFebruary 2, 2017
TO: Rick Olofson
rick.j.olofson@gmail.com
Gary R. Reeder, P.E.
Registered Professional Engineer
2937 Four Corners Drive, Grand Junction, CO 81503
cell: 970/250-9242
e-maii: garyreeder34@gmaii.com
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RE: Underpinning (Piering) 1'ro,jeet --��
0066 Silver Mountain Drive �' "''T XC -774Z100
Glenwood Springs, CO 81601
The proposed piecing plan is attached. Thirty-seven (37) push piers are proposed as shown on the
attached plan. The 26 exterior piers will utilize the 350 System push piers and the eleven (11) push piers
that are proposed in the crawl space will utilize the 288 System.
The enclosed initial laser -level elevation survey was done by me on January 30, 2017. The high area of
the foundation is at the SE corner of the master bedroom adjacent to the wood deck. The lowest portion
of the house is at the NW comer adjacent to the garage and along the west wall of the bedroom. Total
elevation difference in the floor between these two areas of the house is 8-1/4". However, there is a gap
of roughly 5" between the top of the concrete foundation wall and the floor structure at the NW house
corner. This means that the foundation wall will need to be raised five inches (5") before the wall contacts
the floor structure. In other words, if the low NW comer is to be made level with the high area, the
foundation wall will need to be lifted about 13-1/4". This means that if the floor structure was tight to the
foundation wall the floor would show an elevation difference of 13-1/4" rather than the 8-1/4".
Keep in mind that with piering projects, the field conditions encountered during the piering project may
dictate a change in the number of piers and in pier spacing. Unknown subsurface conditions can influence
a change in plan, such as:
•
■
the location of piping and electrical cables,
unknown footing widths when house plans are not available,
Residential Structural Inspections
Foundation Design and Piering
0066 Silver Mountain Drive
page 2
February 2, 2017
• unknown amount and size of rebar in footings and walls,
• the presence of subsurface cobblestones and boulders,
• other unknown conditions that may be encountered.
There are certain situations where short steel beams of HSS cross-section are installed between the
bottom of the footing and the pier bracket to help reduce the point -load pressure from the pier bracket and
to provide support over a larger section of footing and wall. For example, some circumstances where
these beams are used are: under stem wall cracks, to reduce the effective spacing between piers and
beneath some doors and windows if there is a short stem wall height or no stem wall at all. These short
steel beams may be used if conditions warrant
A void of unknown volume will most likely be created under the garage slab as the foundation walls are
raised. You should consider stabilizing this slab with Po1yLEVEL foam or consider removing the existing
slab or portions of it and replace it with a new concrete slab. The foam offers better slab stability and is
more economical than mudjacking. You should discuss this possibility with Foundation Repair of
Western Colorado (FRWC) if you haven't already done so.
I will be available for consultation throughout the duration of this project, and I will be on site at least
once or twice during the piering process. I will be present on site during the lift helping with the final
elevation survey. When the project is successfully completed and finalized, I will certify the project as
such by letter and/or e-mail. You will be provided with the final elevation survey drawing and a final
report.
Please call me if you have any questions.
Respect,liul€y_ : ' fitted,
Gary R. Reeder, PE
CO #19404
attachments (2)
cc: FRWC
Gary R. Reeder, P.E. • 2937 Four Corners Drive • Grand Junction, CO 81503
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