Competitors Cut Valley
Almost all our competitors employ the Cut Valley shingle installation method without installing waterproof underlayment in the valleys. They install the shingles up and past the middle of the valley, then shingle the adjacent section of roof over the center of the valley. Subsequently, they snap a chalk line in the center of the valley and cut the shingles to create a straight line in the center. This method can lead to leaks if they cut too deeply into the lower layer of shingles, increasing the likelihood of future leaks. A significant amount of water drains into the valley, eroding the cut edge of the shingles and causing premature granule loss.
Dennison Roofings – No Cut Valley Installation
At Dennison Roofing, our over five decades of experience have instilled in us the importance of installing waterproof underlayment within the valley to prevent leaks. Subsequently, we proceed with installing a single layer of shingles, commencing from the roof area with the smallest square footage. Fasteners are not installed within six inches of the valley’s center. Shingles are installed that overlap the valley by a minimum of twelve inches into the larger roof area. Subsequently, we snap a chalk line two inches back from the valley’s centerline. Next, we lay a full shingle vertically from the eave edge to the peak. Finally, we complete the installation of shingles for the larger square footage by positioning the lower corner of each row’s shingle two inches back from the centerline, ensuring that it is flush with the edge of the vertical shingle.
This method provides for a leakproof roofing application without having to trim the shingles and also prevents future granule loss.
