Truss uplift; a problem?
Zone 8. Double stud wall, 18″ wide, floating slab on grade. One story house, 41′ clear span. One wall design I’m considering has the load bearing wall as the outer wall, which sits atop the foundation wall. The inner wall will catch the slab by 2″. The air barrier (1/2″ ply) on the outside of the inner wall will be continuous with that in the lid (nailing the plywood to the trusses, taping/gooing, as Thorsten Chlupp does). See pic. I have 2 questions about such a wall. (1) Is truss uplift likely to be a problem by breaking the air barrier formed by the CDX on the outside of the inner wall? I don’t know what to expect, number wise, for any truss uplift at the center of the house, so I have no idea how to proportion that back to 12.5″ from the outer 2×6 wall. 1/16th inch? 1/32? (2) Is it possible to avoid the inner wall bearing significant weight with such a set up? If not, I’d be concerned about cracking the slab. Thanks.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part