How To Lay Roofing Felt Underlay

Is synthetic roof underlayment better than felt.

How to lay roofing felt underlay.

Synthetic roofing underlayment is to be laid horizontally parallel to eave with printed anti slip side up starting at the bottom of the lowest roof eave with a 1 5 underlayment overhang at the eave covering the pre installed eave drip edge. Tack it in place at the corner with the end flush with the end of the roof and the bottom edge of the roll right along the bottom of the roof. Mark the same at the other end of the roll. Laying the felt the roofing felt should be applied in layers that overlap.

As you work the paper can be tacked down in the center so it won t blow away. Unroll your felt onto a flat surface. If you use the lines as guides for installing shingles measure up from the drip edge to confirm that you stay parallel. Roofing felt is a layer of tar paper installed beneath the shingles to provide a backup waterproof membrane in case of leakage.

Start the roof felt at one bottom corner of the roof. Overhang the roof rake edge 1 5 and cover the underlayment with a metal rake edge trim. Roofing felt paper is a common underlayment but adhesive backed underlayment membranes may offer more protection. Scratch a line between the two marks to create a vertical guide for your cut.

The first thing is synthetic roof underlayments have a uv coating. Snap a chalkline 32 inches above the top edge of the wsu or use the lines on the felt as guides. Start at the bottom of the roofline and work up so any water that gets through the roofing material will shed down the tar paper and will not go under it. Adhesive helps the membrane make total contact with the roof which reduces the.

Is felt really that important and what is roofing felt anyway. Lightly scratch a vertical line on the surface with the rear of the blade to mark the length of your shed plus the front and rear overlaps.