Roof Felt Paper Overlap

Felt otherwise known as underpayment is required when.

Roof felt paper overlap.

Felt details for various roof slopes amp. Roofing felt is required to overlap 2 inches over the lower felt course. Uneven strips and wrinkles can allow dust moisture and mold to develop. Although tar paper has traditionally been the standard undercoating for shingles as of 2010 synthetics are becoming more popular as an underlayment.

Convert the area from inches to feet prior to purchasing your felt. One roll of conventional 15 felt covers 432 square feet 40 1 m 2. Pay special attention to movements on top of any roof. Also called roof felt or builder s felt overlapped tar paper creates a water barrier that is your home s last line of defense against the elements if your shingles are damaged by wind hail or.

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 underlayment roofing felt requirements. The overlapping felt creates a secondary barrier for moisture and wicks water away from the shingles above and the sheathing below. However you must allow for overlaps on joints.

The drip edge should extend at least 2 inches on the roof. Cut a slit from the side of a paper roll to accommodate vent pipes. Therefore a 2 inch overlap provides redundancy at the edges where the barrier is weakest. Remember to always overlap roof paper at valley ridges and hips by six inches.

Tar paper also called roofing felt is used under shingles. Roofing felt is a layer of tar paper installed beneath the shingles to provide a backup waterproof membrane in case of leakage. Is roofing felt required. Some materials require heavier felt paper.

In most cases this will leave 400 square feet 37 m 2 of net coverage per 1 roll. The spacing between the nails on the drip edge should be less than 12 inches apart. Strips should always lay flat. Check the requirements for the roofing material that will go over the felt.

Never mount the felt paper on wet sheathing. Mold and mildew will result and you could wind up having to rip off the roof and install a new one. Dry sheathing and felt paper also help ensure a watertight roof in severe climates. Roofing felt or tar paper is infused with a petroleum based solution to provide an additional layer of roof protection under shingles.

This article series discusses roofing felt specifically addressing the roofing code or roofing manufacturer s requirements for use of an underlayment such as roofing felt tarpaper or other underlayment products beneath asphalt shingles and other. Adjacent pieces of drip edge should overlap at least 2 inches 51 mm. Continue along the roof to the other end and trim the felt flush at the end with a utility knife. Purchase enough felt to cover your roof s area.