Rolled Roofing Overlap

How to do it attach first course.

Rolled roofing overlap.

How to install roll roofing on low slope roofs. Roll roofing overlap horizontal choose the overlap width according to the number of plies of roof to be installed. Overlap the next strip of roofing material with the first by at least 4 inches. Plan so that no two butt joints are closer than 2 feet from each other.

Use a 6 inch swath of roofing cement to attach the ends of your strips of roll roofing to the roof itself. Cover hips or ridges last. To seal a plumbing vent spread roofing. Therefore a 2 inch overlap provides redundancy at the edges where the barrier is weakest.

Apply cement at all of the seams and nail down all sheets as you progress leaving room for about one inch of overhang on each side. Smooth down the sheet with your hand to adhere the roll roofing to the roof deck. Pull back 6 inches of the release paper in order to position the start of the roofing sheet accurately. Continue to attach the material with nails every 3 inches.

Position the first course so it overhangs the drip edges by about 1 4 inch and roll it out a. 8 when you encounter a roof valley trim the roll roofing so it ends 1 2 inch from the valley s center. Learn about the liberty sbs self adhering base ply sheet. 2 or 3 varies by manufacturer or 16 12 or 9 exposure for 2 3 or 4 ply roofs respectively.

Clean the roof with a broom to remove any debris. 7 apply the next piece of roll roofing so the overlap covers the nail heads using roofing cement to secure the 2 pieces of roofing together. Roofing felt is required to overlap 2 inches over the lower felt course. Attach drip edge along the edge of the roof with roofing cement.

Extend the front edge of the drip edge so it runs off the roof and into the. The overlapping felt creates a secondary barrier for moisture and wicks water away from the shingles above and the sheathing below. This will help to protect the subsurface. Sbs roll roofing overlap width is commonly 3 4 or 3 6 varying by product and also referred to as the selvage edge width.

Align the length of roll roofing with the lowest edge of the flat roof and flush to the side edge of the roof. Check the sheathing for any nails or screws that may be.