Do Roof diaphragm and ceiling diaphragm work together?
Do Roof diaphragm and ceiling diaphragm work together?
(OP)
In a one story wood frame building in a high wind area, is it acceptable to assume that the ceiling diaphragm and the roof diaphragm work together? and therefore add their plf values together.






RE: Do Roof diaphragm and ceiling diaphragm work together?
However, in that ceilings are sheetrock, and roof diaphragms are plywood, the ceiling diaphragm should fail before the roof diaphragm. When that happens everything goes into the roof diaphragm anyway. That's why the code generally does not allow you to combine dissimilar materials in a shearwall system.
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Do Roof diaphragm and ceiling diaphragm work together?
As M^2 noted- once you lose the drywall ceiling - you are left with the roof only.
RE: Do Roof diaphragm and ceiling diaphragm work together?
If you lose the ceiling, there is not going to be much left of the building anyway.
RE: Do Roof diaphragm and ceiling diaphragm work together?
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.