How Far Should Roof Sheathing 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.

How far should roof sheathing overhang.

Too much overhang and the shingles could blow off in high winds. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood. Roof sheathing overhang on fascia. 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.

I ve trimmed my roof sheathing to run between 5 8 and 3 4 over the sub fascia. 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. A typical metal roof overhang may be 2 to 4 inches or even less. 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.

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. Measure up the rafter 45 3 4 inch from the cut end of the truss tail and snap a line along the trusses. 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.

Nail the drip edge to the roof sheathing at roughly 18 24 spacing intervals using roofing nails. Too little can allow water to seep into rake or fascia boards. The roof sheathing comes down and ends on top of the 1 x fascia. The size of the roof overhang you choose depends largely on the style of your shed s roof.

With a flat shed roof the roof simply extends past the wall plate to provide an overhang. Then i do a metal drip edge to cover it all.