How Much Roll Roofing Do I Need

Use an underlayment under your rolled roofing for extra insulation and weather protection.

How much roll roofing do i need. Place the top edge of the roofing along the chalk line. In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. Rolls of felt coverage for roofs is sold in rolls that are one square each. One msr roofing roll is usually about 36 feet long by 36 inches wide.

Square is a roofing term that refers to one roofing unit of 100 square feet. Applying roofing felt first will better protect the sheathing against condensation as well as against leaking. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. Get the square footage of roof and divide it by 100 and it will give the number of squares you need and for every decimal number over 3 buy a bundle to achieve the amount of material.

The width of the rolled roofing can vary from 36 to 39 inches 91 4 to 99 1 cm depending on your supplier. How many rolls of felt will you need roofing felt is sold by the roll. Owens corning deckseal sa sbs cap 39 375 ft w x 32 833 ft l 100 sq ft shasta white roll roofing. Roll out and cut roll roofing to cover the length of the roof.

1square of roofing covers 100 square feet of roof a bundle is 1 3 of a square. This should give you a 1 inch overhang on the eaves including the top edge. For a slightly sloped roof use the concealed nail method shown. Ft sbs self adhering cap sheet roll for low slope roofing in black liberty sbs self adhering cap sheet is a durable liberty sbs self adhering cap sheet is a durable modified bitumen membrane designed and manufactured to meet industry and code requirements.

The average roll of 15 pound roofing felt covers about 400 ft 2 or 4 squares while the average roll of 30 pound roofing felt covers about 200 ft 2 or 2 squares. You can find underlayment at. One square is equal to 100 square feet. If the roof is sloped you can use the exposed nail method.

So in terms of quantity a roofing roll is about the size of one composite shingle square. One roofing square equals to 100 square feet. Cecil venturella march 3. Rolls of felt are 36 wide x 144 long for 15 and 72 long for 30.

Roll roofing is often installed over bare wood sheathing or sheathing that has been painted with a primer.