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.

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. A conventional roll of felt is enough for 432 square feet. 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. Therefore a 2 inch overlap provides redundancy at the edges where the barrier is weakest. Points to the first course of 15 roofing felt on this roof. Where a roll ends and a new one is begun the two rolls should be overlapped by four inches.

Measure the length of the roof and the breadth of one side. Nail the bottom edges in place and then nail along the sides. Adjacent pieces of drip edge should overlap at least 2 inches 51 mm. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials.

The paper should then be nailed in or stapled every three to four inches across. Multiply those numbers and then double the result for the square footage of your roof. Video of the day. The overhang to the next strip should be 3 8 inch.

Corrugated metal roofing generally comes in sheets that are 3x6 feet in size 18 square feet. About 1 inch just enough to assure the water goes into the gutter and not behind it. Roofing felt is required to overlap 2 inches over the lower felt course. All nails and staples should be placed on the lower half of the paper.

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. 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. 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. 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.