2201 100TH ST SW AURORA DOOR 2018-03-30

4PF WEST COAST S TRUCTURAL b L ENGINEERING, INC. 1624 GROVE ST,UNIT D2 MARYSVILLE,WA 98270 (360)386-9689 wcse.net November 2, 2016 GLY �- 200 112th Ave NE ' 101 Suite 300 Karol- !� Bellevue,WA 98004 Attention: Brian Taylor, Superintendent, GLY Mike Massengill; Foreman, GLY Subject: Shearwall nailing. AD Systems Mezzanine Addition 2201 100th St SW Everett,WA WCSE Project No:W4197 To whom it may concern, This letter is a follow up to conversations with Brian Taylor and Mike Massengilj of GLY construction regarding the above referenced subject. It is our understanding that the building inspector flagged the shearwall nailing during inspections. The nails were overdriven. GLY renailed the sheathing and missed calling for reinspection before finishing. Mayes testing, the testing agency involved in this project, requested that GLY provide guidance from the engineer of record for this project prior to issuing a final letter. A description of the work and photos were supplied to WCSE regarding this matter. A summary of the findings are as follows. The worst case loading, based on the structural calculations, for the shearwalls in question is 135 plf. With the proper nailing,the allowed capacity is 240 plf. The overdriven nails would reduce this allowed capacity. From the photos, it appears the nails were overdriven by about 1/8"or roughly 25%the depth of the sheathing. The reduction in allowable shear force would also be around 25%. This is if the sheathing were not renailed properly. Our recommendation is as follows: Based on the shearwall capacity to still be acceptable with the less than ideal nailing, and that the sheathing nailing was corrected by the foreman of GLY, the nailing as presented should be sufficient without any additional corrective measures to satisfy design loads.