Roof Sheathing Overhang

In the u s roof sheathing is almost always composed of wood usually osb oriented strand board or plywood.

Roof sheathing overhang.

Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood. Points to the installation of ice and water shield along the lower roof eaves protecting against ice dam leaks that are common on un vented roofs in cold weather or snow climates. Position the first piece of plywood or oriented strand board sheathing on the bottom edge of the rafter tails at one end of the roof. Add an inch and a half for subfascia strike a line.

Nail the drip edge to the roof sheathing at roughly 18 24 spacing intervals using roofing nails. Box beam gable framing new gable overhang is framed in the form of a box beam hanging off of a new layer of roof plywood roof sheathing cantilevered over the top of the 3 layers of rigid insulation. Align the long edge of the sheathing with the ends of the. Measure from the edge of the plywood outside of the wall over to whatever the overhang will be and square a line up to indicate the end of the truss tail.

To stabilize the rafters support the roofing material and hold the entire roof together roof sheathing is installed. Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. A tapered piece of sheathing can be cut to fill in at the eave if necessary. Sheath one slope of the roof at a time ripping the top course to the needed width at the ridge.

Add the thickness of the true fascia 15 16 in in this case. A typical metal roof overhang may be 2 to 4 inches or even less. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. The exposed edges of the 3 layers of rigid insulation are no longer exposed.