How Much Overhang On Roof Sheathing

It is at 45 3 4 in.

How much overhang on roof sheathing.

Sheathing should be a minimum of 19 32 inch thick. Also note that a new fully adhered membrane is installed on the original roof deck replacing the one installed 17 years ago is folded down to catch the top edge of the wall water control layer. Measure up the rafter 45 3 4 inch from the cut end of the truss tail and snap a line along the trusses. 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. However the suggested width of an overhang is between 12 and 18 for eaves and no more than 8 for rakes. This is to just enough to cover the 3 4 x6 actual fascia. Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame.

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. Over roof insulation the gable overhang has been cut flush with the wall sheathing. A typical metal roof overhang may be 2 to 4 inches or even less. The typical thickness range for sheathing is 3 8 to 3 4 inch.

Fasten roof sheathing panels properly fasten panels with a minimum of 8d common 0 131 inch by 2 1 2 inch nails spaced a maximum of 6 inches on center at supported panel ends and edges. I ve trimmed my roof sheathing to run between 5 8 and 3 4 over the sub fascia. Never attach roof sheathing with staples. 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.

That said overhangs can extend as far as 2 without the need for external supports.