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RE: 16 ga staples for Roof Sheathing

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APA lists capacities for 14 gauge staples used in plywood diaphragms - refer
to APA Design/Construction Guide - "Diaphragms" Table A-1 Values for
High-Load Horizontal Blocked Diaphragms.
As far as the use of 16 Gauge staples - I would definitely have the
contractor re-nail the panels (assuming the staples are at 6" o/c) with 8d
Commons as you originally required. If that was the way you specified it,
that was the intent of the bid for services, and your client should not
suffer any additional costs.
Sincerely,
Dennis Wish PE