Cut the tapajontas to the peak along each fold. Then fold the gasket cover over the visor and cover the cut ends with a self-adhesive bottom layer.
Roofvalleys channel a large amount of water, so they need additional protection. Start by installing a self-adhesive subfloor on the platform.
This process is much easier with two people. Cut the subfloor to size (or in sections for long valleys) and remove all the plastic support. With one person at each end, fold the subfloor over itself, with the adhesive side facing out. Then place it in the valley and unfold it.
Try to push it down the fold of the valley as hard as possible. If this self-adhesive ice and water subfloor covers both sides of the platform and leaves a gap underneath, it could break once you place the metal gasket cover in the shape of a valley. Pass the subfloor along the dripping edge of the eaves and cut out the rest with a utility knife. Once it's smooth, apply it to the outer edges.
As shingles are installed in the contiguous area of the roof, the end of each row of shingles is trimmed (cut) 2 inches behind the center line of the valley. When you install field shingles to the top of the roof, you can't just “bend” them over the top. Once all the shingles are installed, you'll need to cover (cover) the ridge (and the four-water ridges if you have a gable roof). The next time you read the package instructions or watch an explanatory video on YouTube, you'll have a much better understanding of why roof tiles are installed the way they are installed.
It's essential to follow the manufacturer's nailing instructions; improper nailing is the main cause of roof breakdowns during storms. The best way to prevent ice accumulations is to have an adequate vapor barrier in the attic, adequate insulation and complete ventilation; however, an ice protection membrane is an intelligent component of the roofing system and is likely to be required by the local building code in cold climates. It is impossible to properly install new joint covers and subfloors if the old roof is not torn off beforehand. Once everything that remains under the shingles has been properly prepared and installed, it's finally time to learn how to put shingles on a roof.
For even more detailed information, or if you want to see and learn how the professionals do it, check out this library of instructional videos on all aspects of installing shingles and roof components. If you are installing the type of stackable gasket covers with a rubber cover that seals around the pipe, spray paint the pipe in a color similar to that of the roof. First, before placing field shingles (“field” refers to the large roof extension within the limits of eaves, ridges, and rakes), it is important to install a series of beginner shingles made specifically for that purpose. Place the next row of tiles on top of the first step, then cover that row with a gasket and so on.
Although this seems to contradict the principle of superposition, if you place the drip edge over the subfloor in the rakes, you create a clean edge on the roof and increase the resistance of the subfloor against the wind. The most common gated valley is a “gated valley”, in which shingles are first placed over the entire surface of the roof, on one side of the valley, and each row of shingles extends at least 12 inches along the center line of the valley. While asphalt shingles will be the roof layer that releases the most water, installing a roof subfloor has many advantages.