How Much Overhang On Roofing Felt

About 1 inch just enough to assure the water goes into the gutter and not behind it.

How much overhang on roofing felt. Just below we illustrate shingles installed with too much overhang into the gutter. Corrugated metal roofing generally comes in sheets that are 3x6 feet in size 18 square feet. Nail the bottom edges in place and then nail along the sides. 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.

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. Make sure you have enough roof felt you don t want to have to stop mid way through the project to buy more felt. Points to the first course of 15 roofing felt on this roof. A conventional roll of felt is enough for 432 square feet.

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. A typical metal roof overhang may be 2 to 4 inches or even less. 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.

Where a roll ends and a new one is begun the two rolls should be overlapped by four inches. The drip edge should extend at least 2 inches on the roof. Here phil explains how much overhang a roof should have at the gutter. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials.

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. 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. The paper should then be nailed in or stapled every three to four inches across.

The overhang to the next strip should be 3 8 inch. Adjacent pieces of drip edge should overlap at least 2 inches 51 mm. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood. Video of the day.

Measure the length of the roof and the breadth of one side.