2013-0005 Lang patio cover.pdf
City of Edmonds
PLAN REVIEW COMMENTS
BUILDING DIVISION
(425) 771-0220
DATE: January 4, 2013
TO: John Lang
weswesley@email.com
FROM: Chuck Miller, Plans Examiner
RE: Plan Check: BLD2013-0005
Project: Lang patio cover
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Project Address: 19637 80 Place W
During a review of the plans for the above noted project, it was found that the following
information, clarifications or changes are needed. Please provide written responses as to where the
changes can be found on the plans, cloud all changes on the revised plans, and submit the revised
plans/documents to a Permit Coordinator. Thank you.
On page 1:
1.Indicate the method to be used for the attachment of the roof covering if different than that
referenced by the manufacturer. Specific fasteners, 2 inches long with an EPDM washer,
attached through pre-drilled holes on the crown of every other rib of the corrugated closure
strip in the horizontal direction is noted as the standard installation by the manufacturer.
Alternative means of attachment must be proven to provide equivalent performance.
2.Clarify the callout of the header to be used to support the north end of the center 4x6 girder.
The 4x4 appears to be overspanned and would fail when subject to the 3523 pound point
load developed by the roof structure under the design snow load. A header similar to a #1-
4x8 DF or greater would be required to support such a load.
3.Clarify the callout of T brackets to be used to attach the 4x4 header to its supporting posts.
The use of T brackets typically assumes the attachment of a post to a continuous beam to
properly locate its fasteners for its designed loads. End post caps, such as Simpson EPC,
ACE, LCE, or equivalent, are designed for such installations and, when installed per the
manufacturer, could be used to connect the framing members.
4.Indicate the required maximum 7-3/4 inch riser height and minimum 10 inch tread depth for
the steps to the elevated concrete patio floor per R311.7. There can be no more than 3/8 of
difference between each riser height or tread depth.
On page 2:
5.Clarify the callout of the rafters to be used for support of the roof covering. The 2x6s appear
to be overspanned at 24 on-center and would fail when subject to the weight developed by
the roof structure under the design snow load. Joists similar to #2-2x8 HF or greater would
be required to span more than 8 under those conditions. If installed at 12 on-center, 2x6
joists can span more than 106 with that load.
6.Clarify the callout of the girders to be used to support the roof rafters. The 4x6s appear to be
overspanned and would fail when subject to the weight developed by the roof structure
under the design snow load. Due to the smaller tributary load , the east girder would need to
be similar to #2-4x12 DF to support the load, but a #2-6x12 DF could be used and would
match that required for the center girder due to its larger tributary load. A #2-4x14 DF could
be used for the center girder if uniformity is not a concern.
7.Clarify the on-center spacing and pattern of the cross supports, or purlins, to be used to
support and attach the roof covering. Cross supports/purlins must be no more than 24 apart
per the Load Support Table and are typically installed in-line to facilitate the placement
of the closure strips used for the support and attachment of the roof covering. Alternative
means of attachment must be proven to provide equivalent performance.
8.Indicate the minimum 6 end-to-end panel overlap centered over the closure strip per the
manufacturer.
On page 3:
9.Indicate the fasteners and spacing required for the attachment of the 2x6 fascia to the house
rafters, and the nailer to the garage wall. In addition to supporting the gravity load from
the patio cover, the attachment needs to resist the lateral load, or pulling-away.
10.Indicate the method to be used to attach the rafters to their supporting framing members. In
addition to supporting the gravity load from the patio cover, the attachment needs to resist
the lateral load, or pulling-away, and uplift loads.
11.Provide the required blocking between the rafters, placed over the east girder per R502.7.
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