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.

Roof sheathing overhang on fascia. With a flat shed roof the roof simply extends past the wall plate to provide an overhang. This is to just enough to cover the 3 4 x6 actual fascia. Then i do a metal drip edge to cover it all.

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. It is at 45 3 4 in. On my shed my sheathing does not protrude actually how both my house and shed are done is a 1 x 6 house 1 x4 shed fascia is installed to end of rafters then 1 x 1 1 2 is tacked onto the fascia at the top. Too much overhang and the shingles could blow off in high winds.

Nail the drip edge to the roof sheathing at roughly 18 24 spacing intervals using roofing nails. This indicates the upper edge of the first row of roof sheathing leaving enough overhang that the subfascia and fascia will tuck neatly underneath when the time comes. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. Too little can allow water to seep into rake or fascia boards.

Measure up the rafter 45 3 4 inch from the cut end of the truss tail and snap a line along the trusses. That said overhangs can extend as far as 2 without the need for external supports. A typical metal roof overhang may be 2 to 4 inches or even less. I ve trimmed my roof sheathing to run between 5 8 and 3 4 over the sub 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.