Then fold the flashing over the height and canopy the cut ends with self-stick underlayment.Roof valleys channel a lot of water, in order that they need extra protection. Start by installing self-stick underlayment on the decking. This process is much easier with two folks. Cut the underlayment to size , and peel off the complete plastic backer. With a person on each end, fold the underlayment in on itself, sticky aspect out. Try to push it down into the crease of the valley as tightly as potential. If this self-stick ice-and- water underlayment bridges either side of the decking, leaving a gap underneath, it might tear once you install the metal valley flashing.
Line up the underside of the first row of shingles with the bottom fringe of the starter row, making sure the seams are staggered. With that row full, you will need to determine the reveal (the portion of the shingle that is not covered by the one above it). Standard reveals differ between 5 and 6-half in. Whatever the reveal is supposed to be, snap a horizontal line that distance from the highest of the primary row of shingles . Cut the flashing back to the peak along each crease.
Cover the remainder of the roof with No. 15 asphalt-saturated felt underlayment (some codes could require No. 30). Each layer overlaps the lower one by no less than 2 in. Follow this step by nailing drip edge along rakes , on top of the underlayment. As you … Read More