How Much Overhang On Roof Sheathing

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.

How much overhang on roof sheathing. Measure up the rafter 45 3 4 inch from the cut end of the truss tail and snap a line along the trusses. However the suggested width of an overhang is between 12 and 18 for eaves and no more than 8 for rakes. 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. The typical thickness range for sheathing is 3 8 to 3 4 inch.

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

Never attach roof sheathing with staples. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. 8d ring shank nails should be used instead. Roof sheathing overhang on fascia.

Over roof insulation the gable overhang has been cut flush with the wall sheathing. 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. I ve trimmed my roof sheathing to run between 5 8 and 3 4 over the sub fascia.

Overhangs can vary from a few inches to a few feet depending on preference.