HomeMy WebLinkAboutEngineer's Report 07.29.2017IIURTZ & ASSOCIATES" Inc. Stnrctural Consultants
5012 County Road 154 Phone + Fax (970) 945-6305
Glenwood Springs, Co. 81601
MEMORANDUM
TO: GARFIELD COUNTV BUILDING & PL.{NNING DEPT
108 Eight Street, Glenwood Springs, Co.
(2) Pages
July 29,2O17
ATTN: ANDY SCTIWALLER
COPY: MICHAEL \ilOELKE C/O MAYAN PIERING
RE Residence at 54 Silver Mountain Drive,
lronbridge Subdivision; Garfield County, Colorado
Our office acted as a structural consultant for foundation repa¡rs of the noted
residence. The repâirs were undertaken by Mayan Piering in November and
December 2A16. Note that the foundation had been previously repaired (i.e.
'underpinned') in 2O1 0.
Our office issued a memo detailing our involvement in the repair process on
November 23,2016. The repair process involved welding extensions onto the
top of existing pier shafts and installing new adjustable leveling brackets. The
original foundation repair documents dated August 27, 2010 specified the
installation of twenty-nine (29) driven structural steel 'helical' piers to underpin
and stabilize a port¡on of the residence's foundation. ihe noted construction
documents specify pier locations and the required safe design load each pier is
to support.
Note that the residence is founded over a crawl space which measures, in plan,
approximately 46'-5" east-to-west by 35'7" north-to-south. A three car vehicular
garage is attached to the east end of the residence, There is a covered entry
porch on the north side of the residence and a covered patio on the south side.
The entry porch roof and patio roof are supported by timber posts which bear on
concrete walls which extend from and were originally poured monolithically with
the primary crawl space foundation walls. There are two (2)-8'-0" long wing
walls and one (1)-2'-10' long wing wall extending from the primary foundation at
the entry porch. There are two (2)-5'-10" long wing walls are the rear patio.
Each of the wing walls is supported by a helical pier.
It was determined that, given the present helical pier system, that future
performance of the foundation would be enhanced by detaching to two patio
wing walls and the center 8'-0" long entry porch wing wallfrom the primary
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foundation. This was accomplished by saw cutting the wing walls with a vertical
cut at the exterior face of the primary wall.
The noted piers were hydraulically loaded to lift, re-level and stabilize the
foundation on December 03 through December 08, 2016.
I have reviewed the log of the pier 'lift' values as provided by Maya Piering.
I have also discussed the results of the installation procedure with Michael
Woelke of Mayan Piering. I understand that Mayan Piering has established a
monitoring program and intends to, if necessary, periodically re-level the
foundation using the hydraulically driven adjustable brackets.
At the southeast corner of the crawl space the primary concrete foundation wall
had suffered a significant vertical crack. The crack extends through the wall.
Given the location of the helical piers, I determined that a mechanical repair (i.e
steel reinforcement angies and'epoxy' boits¡was not nec€ssary.
I recommended that the crack be repaired with 2-parl structural epoxy.
It is my professional opinion that the foundation repairs have been successfully
performed in accordance with the noted construction documents.
Kurtz and Associates, lnc.
Brian Kurtz, P.E.
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