How Much Overhang On Roofing Felt

Points to the first course of 15 roofing felt on this roof.

How much overhang on roofing felt.

The paper should then be nailed in or stapled every three to four inches across. Roofing felt is required to overlap 2 inches over the lower felt course. Greater overhang becomes a point of leverage for gusts of wind to rip off your roofing. Here phil explains how much overhang a roof should have at the gutter.

The overhang to the next strip should be 3 8 inch. The vertical leg of the drip edge should be at least 1 5 inches wide and extend at least 0 25 inches below the sheathing. Where a roll ends and a new one is begun the two rolls should be overlapped by four inches. Corrugated metal roofing generally comes in sheets that are 3x6 feet in size 18 square feet.

Therefore a 2 inch overlap provides redundancy at the edges where the barrier is weakest. This should give you a 1 inch overhang on the eaves including the top edge of the installed drip edge trim installed in step 1. Just below we illustrate shingles installed with too much overhang into the gutter. Since you will have overlap between rows this works out to a total coverage area of 400 square feet the dimensions of a 20 x 20 roof.

The lower edge of the felt is overlapped 3 4 on top of and over the upper edge of the lower course of ice and water shield. Make sure you have enough roof felt you don t want to have to stop mid way through the project to buy more felt. The drip edge should extend at least 2 inches on the roof. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood.

Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. Before you start to install corrugated metal roofing you need to figure out how much you need. All nails and staples should be placed on the lower half of the paper. A typical metal roof overhang may be 2 to 4 inches or even less.

Multiply those numbers and then double the result for the square footage of your roof. A conventional roll of felt is enough for 432 square feet. Adjacent pieces of drip edge should overlap at least 2 inches 51 mm. Nail the bottom edges in place and then nail along the sides.

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