How Much Overhang On Roofing Felt

Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood.

How much overhang on roofing felt.

Multiply those numbers and then double the result for the square footage of your roof. All nails and staples should be placed on the lower half of the paper. 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. Before you start to install corrugated metal roofing you need to figure out how much you need.

A typical metal roof overhang may be 2 to 4 inches or even less. 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. Roofing felt is required to overlap 2 inches over the lower felt course. Video of the day.

Measure the length of the roof and the breadth of one side. The overlapping felt creates a secondary barrier for moisture and wicks water away from the shingles above and the sheathing below. Therefore a 2 inch overlap provides redundancy at the edges where the barrier is weakest. A conventional roll of felt is enough for 432 square feet.

Adjacent pieces of drip edge should overlap at least 2 inches 51 mm. Points to the first course of 15 roofing felt on this roof. Just below we illustrate shingles installed with too much overhang into the gutter. The paper should then be nailed in or stapled every three to four inches across.

Nail the bottom edges in place and then nail along the sides. Make sure you have enough roof felt you don t want to have to stop mid way through the project to buy more felt. 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. Where a roll ends and a new one is begun the two rolls should be overlapped by four inches.

Here phil explains how much overhang a roof should have at the gutter. The overhang to the next strip should be 3 8 inch. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. Corrugated metal roofing generally comes in sheets that are 3x6 feet in size 18 square feet.

The drip edge should extend at least 2 inches on the roof.