090122,123 Belanich duplexes.pdf
City of Edmonds
PLAN REVIEW COMMENTS
BUILDING DIVISION
(425) 771-0220
DATE: 3/11/09
TO: Darryl & Carolyn Belanich
7508 210TH ST SW
Edmonds, WA 98026
FROM: Pat Lawler
RE: Plan Check: BLD20090122, &0123
Project: Two duplexes
Project Address: 7510 & 7512 210TH ST SW
During 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, and submit revised plans/documents to a Permit Coordinator.
1.Provide a detail for the listed one hour fire resistive rated common wall assembly that separates
the units, that has been tested in accordance with ASTM E 119., per R317.1
2.Show how the fire rating continues through the joists to the floor deck.
a.One method to achieve the one hour rating at the floor joist level would be to use a
solid beam atop the wall with top flange hangers. To do so it would be necessary to
have the engineer of record (EOR) perform the burn through calculatuions in IBC
721.6.3. The EOR would then indicate the required connection to the wall.
3.For the attic separation, because 5/8 type X gypsum board is proposed at the ceiling, and the
walls with ½ gyp., then R317.1 exception 2 could be used to install a draft stop in the attic at the
common wall, instead of the more complicated and expensive one hour wall. This could be
constructed using a gable end type truss with ½ plywood or ½ gyp board. If you would like to
propose using this exception, then provide a detail to match.
4.The minimum attic ventilation at the eaves, based on 1/300 total attic ventilation, would be 1.72
net square feet. Based on (2)-2.5 diamenter holes per birdblock and the max. apparent
number of blocks, only 1.29 square feet gross (not subtracting for the mesh) is proposed,
which is inadequate ventilation. Revise plans to include the minimum required ventilation.
5.Include the Shear Wall Schedule in the full sized plans.
Pat Lawler
patrick.lawler@ci.edmonds.wa.us
Plans Examiner
425 771 0220 x1703