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Project No: 180140.01 Date: May I7, 2018
SProject Name: Trinity Community Church CEVF t
U Subject: Building Assessment (basement at entry)
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By: Curtis Gagner, PE SEf-AIV OfItUr -lit'
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15895 SW 72ND AVE
To: Bruce Pearson BUILDING
SUITE 200
PORTLAND, OR 97224
PHONE:501226.1285 CIDA performed a visual examination of the basement construction for the existing building
FAX:503.226.1670 located at 10900 SW 121 n Ave, Tigard OR on Tuesday May 15, 2018. The purpose of the
INFO@a CIDAINC.COM walkthrough was to visually assess the roof framing over the basement section of the building
WWW.CIDAINC.COM structure to determine general condition of building and look for any areas of concern.
The subject building is a one-story addition to the original church building built in the 1970's to
house classroom functions. The current building was originally intended to serve as the basement
to a two story structure but construction was terminated with a wood framed roof/floor
approximately two and a half feet above finish grade on the west side. As a temporary measure
until the second story was to be built, the structure was roofed with a built up roof membrane
and a walkway was placed on top of the roofing using rubber pads. This condition remains today.
The roof was framed with glulam beams spanning E-W and decked with 2x6 T&G decking over
most of the roof. The south three bays were framed with 2x6 subpurlins between the glulams
and decked with plywood sheathing,the beams in this area are spaced farther apart than the rest
of the roof. A quick check of the original framing indicates that the framing was designed for a
live load of 50psf.
Based on our observations,there are several areas of structural concern with the wood framing
for this building.
I) Southern roof section has experienced significant roof leaks in the past, especially at the
west wall. The end of the southern girder is rotted and soft.
2) Several of the glulam girders appear to have been installed upside down based on the fact
that the bottom lamination on these beams have a butt joint near midspan. These joints do
not transfer tension, essentially reducing the beam depth by I 'A" which reduces the
capacity of the beam 20%.
3) Most of the glulams are showing signs of glue failure and delamination. This has resulted in
increased deflection of the beams and also reduces the load capacity of the beams.
4) Guardrails along walkway over roof are attached with post bases bolted through the tongue
and groove decking. These penetrations have leaked over time and the decking around
them has rotted in some locations.
Efforts have been made in the past to mitigate some of these issues by adding posts under some
of the girder beams and a bearing wall under the beam closest to the walkway. There were also
some locations under the walkway where 2x framing has been added to provide additional
support to the decking where it has lost capacity due to rot.
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PORTLAND, OR 97224
PHONE:503.226.1285 -_- : .: .
FAX:503.226.167{? " -. . -
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Rot at end of girder, beam and rim joist are soft.
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Failed splices at bottom lamination of girders.
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Beam delamination 1
where glue is failing at joints.
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Guardrail support post anchor with rotted decking adjacent and added support framing
Summary:
The roof structure for this building has significantly reduced capacity due to moisture damage
and possible incorrect installation of beams. Based on the severity of the glue failure in the
girders it is our opinion that the wood framing in this structure is approaching the end of it's
useable life and will need to be replaced in the near future. Any new construction done as part
of the entry revisions will need to take into account that the existing structure will need to be
1111 re-framed to support floor loads.
Recommendations:
In order to continue using walkway over roof we recommend the following:
15895 SW 72ND AVE • Continue to monitor condition of 2x decking under walkway and add new framing below
SUITE 200 any areas of rot.
• Monitor condition of glulam girder on north side of walkway. If beam starts to show
PORTLAND, OR 97224 increasing deflection or more delamination, install posts at third points.
PHONE:503.226.1285 • Limit access to remainder of roof to roof maintenance only.
FAX:503.226,1670
INFO@CIDAINC.COM
WWW.CIDAINC.COM
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