How Far Should Roof Sheathing Overhang

The roof sheathing comes down and ends on top of the 1 x fascia.

How far should roof sheathing overhang.

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. I ve trimmed my roof sheathing to run between 5 8 and 3 4 over the sub fascia. Too much overhang and the shingles could blow off in high winds.

Roof sheathing overhang on fascia. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood. The edge of the shingles should hang over a roof between an inch and an inch and a half or between a half inch and three quarters of an inch if drip edge flashing is installed. That said overhangs can extend as far as 2 without the need for external supports.

Slide the sheet one rafter width over the end of the roof so the edge is centered on the next rafter offset one rafter spacing from the first piece of installed sheathing from the row below. With a flat shed roof the roof simply extends past the wall plate to provide an overhang. 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. Now that i ve modeled what i was going to build i decided i need a piece of molding to break up the plain look of just the fascia trim plank.

Measure up the rafter 45 3 4 inch from the cut end of the truss tail and snap a line along the trusses. It is at 45 3 4 in. The size of the roof overhang you choose depends largely on the style of your shed s roof. Then i do a metal drip edge to cover it all.

Nail the drip edge to the roof sheathing at roughly 18 24 spacing intervals using roofing nails. This is to just enough to cover the 3 4 x6 actual fascia.