DIAPHRAGM ACTION
DIAPHRAGM ACTION
(OP)
in an existing house the roof joists have been raised 2 feet above the top of the brick wall, and frame into the rafters. the roof joists support an uninhabitable attic floor. There are two wood plates at the top of the wall which i do not think that are connected to the wall. the rafters sit on these plates with a bird's mouth cut. How can i provide diaphragm action at the top of the wall for wind loads?





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cross section showing wall, attic floor and roof
RE: DIAPHRAGM ACTION
RE: DIAPHRAGM ACTION
RE: DIAPHRAGM ACTION
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For longitudinal loads(into page) if you provide a diaphram in the sloped portion of the wall that is continuous between the end walls then this will give a push/pull at the end walls (and therefore the lateral component can be taken out by the end walls) you are then left with a lateral load along the top of the vertical wall that can be taken out as if by a normal shear wall.
RE: DIAPHRAGM ACTION