HomeMy WebLinkAboutEngineer Report 2-1-11.pdfS K PEIGHTAL ENGINEERS Ltd
STRUCTURAL CONSULTANTS
February 1, 2011
Michael Doyle
Michael Doyle Architects
204 Park Avenue - 1D
Basalt, CO 81621
mjdarch@sopris.net
Re: Lower Level Renovation
Walter Residence
5349 Rimledge Road
Garfield County, Colorado
page 1 of 2
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Dear Michael,
I visited the above referenced residence on January 14, 2011, with Jim Wood (Builder).
The intent of this visit and report is to observe existing conditions, and to discuss
possible structural implications with regards to renovation work to convert crawl space
into living space. This report is limited to observed construction concerns only. Our
services do not include determining the presence, prevention, or the possibility of mold
or other biological contaminants to develop.
The original residence is a dovetail timber structure. This was followed by a single
story standard wood frame addition over crawlspace. Work has been recently
performed to convert this crawlspace into living space.
The original main floor framing is observed to be 2 x 10 joists, spanning between
10 x 10 timber beams. These beams run along four lines through the residence, and are
supported by 8"12) concrete piers, on concrete footing pads. It appears that the residence
perimeter is also structured with these timber beams, and pier foundation.
The soils observed in the crawlspace left in-place appear to be cobble basalt rock. The
crawlspace provides approximately 4 -feet clearance. It is my understanding that the
renovation work at the crawlspace exterior perimeter is comprised of a poured -in-place
concrete wall, spanning between the original concrete piers. The interior face of this
perimeter wall is observed to be covered with a rigid insulation board.
The area that has been claimed for living space has been excavated lower, and a
concrete slab -on -grade floor placed. The original timber beam support piers at this area
have been replaced with glu-lam columns, bearing on new concrete piers with steel
base connectors. One timber beam has been reinforced with steel side plates, to span
over a removed pier.
SKPE • 204 Park Avenue • Unit #1C • Basalt, CO • 81621 • (970) 927-9510 • skpe@sopris.net
page 2 of 2
Conclusions
With exception to the indicated glu-lam columns and the reinforced beam, structural
framing over the lower level is understood to be original work unaltered by the
renovation. It was noted that the original beam to pier supports do not have a
mechanical connection.
The renovation concrete elements observed appear to be quality material, as no distress
cracks are found at representative samples . Even typical shrinkage cracking is not
evident. This is a good indication of, at a minimum, the presence of shrinkage
reinforcing steel. Soil pressure to the exterior fill-in walls would be expected to be
satisfied with the presence of shrinkage steel reinforcing.
Recommendations
1- With exception to the one reinforced timber beam, this renovation was approached
to maintain the historic load paths as unchanged. I have reviewed the one reinforced
beam for structural capacity, and recommend that additional reinforcing work be
performed. Refer to attached Clarification details for two options regarding this work.
Option -A adds to the existing steel plates on both sides of the timber. Option -B requires
removal of the existing steel plates, and adding steel channels to both sides of the
timber.
2- Connection details are also recommended for the timber beam to piers and glu-lam
columns. Refer to attached Clarification details for typical connection work.
Please call my office with any questions.
Sincerely,
Stephen eightal, PE
president
cc: Jim Wood
akuma198@comcast.net
Bill Walter
bill@waltermail.us
11001
SKPE • 204 Park Avenue • Unit #1C • Basalt, CO • 81621 • (970) 927-9510 • skpe@sopris.net
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