How To Install Roof Underlayment

Apply drip edge to the eave.

How to install roof underlayment.

Start the roof felt at one bottom corner of the roof. How to install roofing underlayment. 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. Step 4 rolling the underlayment.

4 lay the membrane on the roof with the plastic. 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. 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. Peel the release liner from the membrane.

Step 1 safety. The lap is half the width of the roll plus one extra inch for headlap. The standard approach for two ply roofing underlayment is to lap a 36 inch roll by 19 inches. Peel back 1 to 2 feet of release liner align membrane.

Step 5. Minimum overlap guidelines are set by the. 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.

Put on your protective eye wear and work boots before you begin. Overhang the roof rake edge 1 5 and cover the underlayment with a metal rake edge trim. Step 3 preparing the underlayment. Be careful moving up and down the ladder.

Be cognizant of the. Cut drip edge flashing at an angle at the corner press it lightly against the eave end not too hard or you will misshape it and drive a nail near the end. Step 2 preparing the roof. This provides two plies across the entire roof with three plies at the headlap.