Roof Sheathing Ridge Gap

Roof trusses must be dry when sheathing a roof with osb to prevent mold growth in the roof and coverage gaps as the trusses dry and shrink.

Roof sheathing ridge gap.

Leave a 3 mm 1 8 inch gap between the osb panels to allow for expansion. I have seen two thoughts. The last course at the top may need to be rip cut if the roof is not in 4 foot increments. But where the wall sheathing meets the roof sheathing there is a gap of approximately 1 8 of an inch.

This is a simple pitched roof line with ridge beam and rafters attached with slope hangers. It s a simple gable roof with vents at either end and a ridge vent. How should the sheathing meet at the roof peak when there will be no ridge vent. Begin applying the sheets from the bottom of the roof the eaves and work your way up to the ridge.

Avoid butting osb panels tightly. Ridge vents when the roof sheathing is used as a structural diaphragm as it typically is in high wind and seismic hazard areas the structural integrity of the diaphragm can be compromised by a continuous vent see figure a below left. To calculate an example of exhaust and intake use 25 feet of roof ridge vent. This gives you 450 square inches of total exhaust.

The house does not have an overhang. Stagger the panels over the roof with 2 supports between panel ends. Now wait a minute. And i was advised that that gap should be protected by a home inspector.

The gap size typically between 1 and 3 inches. Maintain ridge nailing by adding additional blocking set back from the ridge or by using vent holes see. Multiply it by 18 square inches the net free air per foot of ridge. Leave a slight gap as if the sheathing was cut a little short and install the sheathing to a matching edge no gap.

Vents evenly spaced underneath the roof provide intake.