How Far Should Roof Sheathing Overhang

This would add another 3 4 to the thickness.

How far should roof sheathing overhang.

This is to just enough to cover the 3 4 x6 actual fascia. Too much overhang and the shingles could blow off in high winds. However the suggested width of an overhang is between 12 and 18 for eaves and no more than 8 for rakes. Two feet is the general maximum length for a typical roof overhang.

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. 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. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. Nail the drip edge to the roof sheathing at roughly 18 24 spacing intervals using roofing nails.

A typical metal roof overhang may be 2 to 4 inches or even less. 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. Overhangs can vary from a few inches to a few feet depending on preference. I ve trimmed my roof sheathing to run between 5 8 and 3 4 over the sub fascia.

That said overhangs can extend as far as 2 without the need for external supports. 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. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood. It is at 45 3 4 in.

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. Too little can allow water to seep into rake or fascia boards.