How Much Overhang On Roof Sheathing

The typical thickness range for sheathing is 3 8 to 3 4 inch.

How much overhang on roof sheathing.

Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood. 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. That said overhangs can extend as far as 2 without the need for external supports. 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. Roof sheathing overhang on fascia. Measure up the rafter 45 3 4 inch from the cut end of the truss tail and snap a line along the trusses. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials.

The roof sheathing comes down and ends on top of the 1 x fascia. 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. Never attach roof sheathing with staples. It is at 45 3 4 in.

Roof sheathing comes in grid marked 4 by 8 foot sheets and should be installed perpendicular to the frame. 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. 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. This is to just enough to cover the 3 4 x6 actual fascia.

Sheathing should be a minimum of 19 32 inch thick. Then i do a metal drip edge to cover it all. However the suggested width of an overhang is between 12 and 18 for eaves and no more than 8 for rakes.