How Much Overhang On Roofing Felt

The edge of the shingles should hang over the edge of the roof between an inch and an inch and a half or between a half inch and three quarters of an inch if drip edge flashing is installed and in most cases it should be.

How much overhang on roofing felt.

Greater overhang becomes a point of leverage for gusts of wind to rip off your roofing. A conventional roll of felt is enough for 432 square feet. About 1 inch just enough to assure the water goes into the gutter and not behind it. A typical metal roof overhang may be 2 to 4 inches or even less.

Therefore a 2 inch overlap provides redundancy at the edges where the barrier is weakest. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. Here phil explains how much overhang a roof should have at the gutter. Adjacent pieces of drip edge should overlap at least 2 inches 51 mm.

Before you start to install corrugated metal roofing you need to figure out how much you need. Make sure you have enough roof felt you don t want to have to stop mid way through the project to buy more felt. Multiply those numbers and then double the result for the square footage of your roof. The overlapping felt creates a secondary barrier for moisture and wicks water away from the shingles above and the sheathing below.

Corrugated metal roofing generally comes in sheets that are 3x6 feet in size 18 square feet. The overhang to the next strip should be 3 8 inch. 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.

Knowledgeable roofers will install shingles at just the right overhang for your roof type. Nail the bottom edges in place and then nail along the sides. All nails and staples should be placed on the lower half of the paper. Video of the day.

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. Roofing felt is required to overlap 2 inches over the lower felt course. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood. The drip edge should extend at least 2 inches on the roof.