Effect of ridge vent (unnailed plywood edge) on structure
Effect of ridge vent (unnailed plywood edge) on structure
(OP)
I have been told by the inspectors that roof plywood needs to be nailed at the ridge and at the eave blocks to provide a proper "diaphragm". Yet To provide continous ventilation in the rafter bay between the eaves and the opening at the continous ridge vent I cannot install blocking or a ridge board for nailing without restricting the air flow between the eaves (exterior wall) and the ridge vent. Assuming installed insulation that provides an inch of space at the top of the rafter bay for the ventilation.
This is specifically in regards to a standard framed residential roof with rafters set on top of a ridge beam that spans 18' and 14' for a total length of 32'. I have sometimes seen simpson straps installed over the ridge from rafter to rafter....does this tie the diaphragms together? Any suggestions or explantion of this would be great.
This is specifically in regards to a standard framed residential roof with rafters set on top of a ridge beam that spans 18' and 14' for a total length of 32'. I have sometimes seen simpson straps installed over the ridge from rafter to rafter....does this tie the diaphragms together? Any suggestions or explantion of this would be great.






RE: Effect of ridge vent (unnailed plywood edge) on structure
As far as ventilation, I do not know. I always leave it to the architecht.
RE: Effect of ridge vent (unnailed plywood edge) on structure
APA produces tons of literature to guide you.
https://www.apawood.org/
Good luck...
RE: Effect of ridge vent (unnailed plywood edge) on structure
I'VE USED DETAILS WHERE YOU DRILL HOLES IN THE BLOCKING TO ALLOW FOR AIR MOVEMENT. SIZE AND NUMBER OF THE HOLES DEPENDS ON THE DEPTH OF THE BLOCKING AND THE SHEAR FORCES YOU ARE TRYING TO TRANSFER. DON'T KNOW HOW THAT INTERFACES WITH YOUR INSULATION LAYOUT THOUGH.