How To Install Roof Underlayment

Apply drip edge to the eave.

How to install roof underlayment.

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. Step 1 safety. Step 5.

Back roll method cut the membrane into 10 to 15 foot lengths and re roll loosely. This provides two plies across the entire roof with three plies at the headlap. Step 3 preparing the underlayment. Put on your protective eye wear and work boots before you begin.

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. 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. Be careful moving up and down the ladder.

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. Be cognizant of the. Start the roof felt at one bottom corner of the roof.

How to install roofing underlayment. Minimum overlap guidelines are set by the. Press the membrane of the self adhering roofing underlayment in place with. In roof areas where roof planes meet to form valleys which naturally channel high water flow in wet weather and other roof penetrations such as skylights plumbing vents roof to wall intersections are also important roof areas that can benefit from peel and stick membrane underlayment installation.

The lap is half the width of the roll plus one extra inch for headlap. Overhang the roof rake edge 1 5 and cover the underlayment with a metal rake edge trim. Step 4 rolling the 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.