How Much Overhang On Roofing Felt

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

How much overhang on roofing 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. The paper should then be nailed in or stapled every three to four inches across. 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.

About 1 inch just enough to assure the water goes into the gutter and not behind it. Metal is usually installed on rafters or strip sheathing rather than the solid decking used under other materials. Nail the bottom edges in place and then nail along the sides. The overlapping felt creates a secondary barrier for moisture and wicks water away from the shingles above and the sheathing below.

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. Greater overhang becomes a point of leverage for gusts of wind to rip off your roofing. Just below we illustrate shingles installed with too much overhang into the gutter.

Here phil explains how much overhang a roof should have at the gutter. 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. Some slight overhang is recommended in conjunction with a drip edge flashing to prevent water from getting under the roofing and onto underlying wood.

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

Video of the day. Multiply those numbers and then double the result for the square footage of your roof. Roofing felt is required to overlap 2 inches over the lower felt course. Adjacent pieces of drip edge should overlap at least 2 inches 51 mm.

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