How To Install Roll Roofing Over Shingles
Step by step roll roofing installation 1.
How to install roll roofing over shingles. Install roll roofing measure 35 inches up from the eaves at several intervals along the roof and mark them. This aluminum flashing protects the edges of the roof sheathing. After the eave drip is in place it is time to lay the roll roofing. Rip cut the starter strip or starter pieces so that they butt up against the second course of existing shingles and are even with the front edge of the existing roofing.
Snap a chalk line as a guide for the first layer roofing. Prepare a valley between joined roofs by cutting a strip that is 18 inches wide and covers the entire length of the. Attach with nails along the top edge of the strip. Use a starter strip or cut pieces for a starter course.
Do not use the eaves as a guide instead because they can be uneven. Use a trowel to spread roofing cement over half or more of the strips. As with the felt paper it is very important to properly align the roll roofing. Then set the first course in the cement so it overhangs by about 1 4 inch.
It needs to be nailed down with each nail spaced roughly 6 inches apart. Nail only its top edge the part that is bare of mineral coating.