How Much Should Roof Sheathing Overhang

Drip edge varies in dimensions but typically the flange that nails to the roof surface is about 2 5 wide and the vertical edge that directs roof runoff down and away is about 1 5 in depth.

How much should roof sheathing overhang.

Measure up the rafter 45 3 4 inch from the cut end of the truss tail and snap a line along the trusses. When ordering the sheathing divide the total number of square feet of roof surface by 32 square feet a 4 x 8 panel and add an extra 15 for waste. I ve trimmed my roof sheathing to run between 5 8 and 3 4 over the sub fascia. Too little can allow water to seep into rake or fascia boards.

Overhangs can vary from a few inches to a few feet depending on preference. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood. Thickness will range from 3 8 to 3 4 inch depending upon local code. Choose an exterior c d grade.

Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. However the suggested width of an overhang is between 12 and 18 for eaves and no more than 8 for rakes. This would add another 3 4 to the thickness. Too much overhang and the shingles could blow off in high winds.

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. That said overhangs can extend as far as 2 without the need for external supports. The drip edge also gives us a nice straight edge with which to align roof shingles slates or other roofing material. A typical metal roof overhang may be 2 to 4 inches or even less.

It is at 45 3 4 in.