Roof Sheathing Ridge Gap

To calculate an example of exhaust and intake use 25 feet of roof ridge vent.

Roof sheathing ridge gap.

Begin applying the sheets from the bottom of the roof the eaves and work your way up to the ridge. Leave a 3 mm 1 8 inch gap between the osb panels to allow for expansion. Now wait a minute. Avoid butting osb panels tightly.

So you re talking about you re going to reroof and you have a gap between the wall sheathing and the roof sheathing. The gap size typically between 1 and 3 inches. 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. Ridge vent installation in new construction the roofing contractor leaves a small gap at the peak of the roof when installing the roof sheathing.

This is a simple pitched roof line with ridge beam and rafters attached with slope hangers. Vents evenly spaced underneath the roof provide intake. How should the sheathing meet at the roof peak when there will be no ridge vent. Maintain ridge nailing by adding additional blocking set back from the ridge or by using vent holes see.

Leave a slight gap as if the sheathing was cut a little short and install the sheathing to a matching edge no gap. And i was advised that that gap should be protected by a home inspector. Multiply it by 18 square inches the net free air per foot of ridge. It is important here that the sheathing at the eave line be exactly perpendicular to the rafters so that the sheets will meet at the centers of the rafters.

Stagger the panels over the roof with 2 supports between panel ends. 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. The house does not have an overhang. This gives you 450 square inches of total exhaust.

It s a simple gable roof with vents at either end and a ridge vent.