How Much Overhang For Roof Sheathing

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

How much overhang for roof sheathing.

Find the area of a roof. Measure up the rafter 45 3 4 inch from the cut end of the truss tail and snap a line along the trusses. A typical metal roof overhang may be 2 to 4 inches or even less. However the suggested width of an overhang is between 12 and 18 for eaves and no more than 8 for rakes.

To find the amount of plywood needed to cover a roof start by finding the area of the roof. Multiply the length of the roof in feet by the width of the roof in feet to find the area of the roof in square feet. It is at 45 3 4 in. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood.

The typical thickness range for sheathing is 3 8 to 3 4 inch. Never attach roof sheathing with staples. 8d ring shank nails should be used instead. Sheathing should be a minimum of 19 32 inch thick.

Once the area is known divide by the area of a 4 8 sheet to find how much sheathing is needed. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials.