HomeMy WebLinkAboutEngineer's Design Report 11.11.2016November 11, 2016
TO: Marcelino Holguin
100 River Bend Way
Glenwood Springs, CO 81601
holguinmarcelino@yahoo.com
RE: Underpinning (Piecing) Project
100 River Bend Way
Glenwood Springs, CO 81601
Gary R. Reeder, P.E.
Registered Professional Engineer
2937 Four Corners Drive, Grand Junction, CO 81503
cell: 970/250-9242
e-mail: garyreeder34@gmail.com
The proposed piering plan is attached. Eleven (11) push piers (350 system) are proposed as shown on the
attached plan. Because of the magnitude of settlement at the SE corner it is anticipated that up to ten slab
piers may need to be installed as shown. The number of slab piers and their locations are not rigidly set,
and they may be moved depending upon the reaction of the concrete slab as it is lifted.
An initial laser -level elevation survey was done by me on November 7, 2016. The high area of the
foundation is at the south wall about 12 feet from the SE corner. The low area is at the NE corner, about
±6-5/8" lower than the high area. The highest area at the basement slab, however, is located at the corner
of the closet under the stairway, as shown on the "Floor Elevation" drawing that is attached.
The settlement along the east wall has caused severe cracking at the wall and ceiling adjacent to and over
the countertop.
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 plans are not available,
• unknown amount and size of rebar in footings and walls,
• the presence of subsurface cobblestones and boulders,
• other unknown conditions that may be encountered.
■ Residential Structural Inspections
• Foundation Design and Piering
100 River Bend Way
page 2
November 11, 2016
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 foundation 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. For this project no steel beams may be necessary unless
cracking is shown to be present in the foundation walls after excavating. It is recommended that the soil
along the foundation walls be excavated to decrease the weight on the footings.
A void of unknown volume may be created under the basement slab as the foundation walls are raised. If
this occurs, you should consider stabilizing the slab with Po1yLEVEL foam. The foam offers better slab
stability and is more economical than mudjacking. You may want to discuss this possibility with
Foundation Repair of Western Colorado (FRWC).
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.
Please call me if you have any questions.
Respectfully submitted,
Gary R. 1Z eder, PE
CO #19404
attachments (2)
cc: FRWC
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