How To Install Roof Underlayment

How to install roofing underlayment.

How to install roof underlayment.

Measure the underlayment to the length of the roof plus the 4 inches of excess and cut the membrane straight across with a utility knife or shears. Minimum overlap guidelines are set by the. Step 4 rolling the underlayment. Be careful moving up and down the ladder.

Peel back 1 to 2 feet of release liner align membrane. Start the roof felt at one bottom corner of the roof. Step 1 safety. Install drip edge at the roof eave edges.

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. Back roll method cut the membrane into 10 to 15 foot lengths and re roll loosely. Overhang the roof rake edge 1 5 and cover the underlayment with a metal rake edge trim. The standard approach for two ply roofing underlayment is to lap a 36 inch roll by 19 inches.

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. Be cognizant of the. Peel the release liner from the membrane. Use a chalkline or align it by eye to make sure it is straight then drive roofing nails every foot or so to fasten it to the sheathing.

4 lay the membrane on the roof with the plastic. Apply drip edge to the eave. The lap is half the width of the roll plus one extra inch for headlap. Step 3 preparing the underlayment.

Step 2 preparing the roof. Put on your protective eye wear and work boots before you begin. Step 5. Press the membrane of the self adhering roofing underlayment in place with.