Install Asphalt Shingles Roof Valley

Many roofers cut the shingles across because they say it s safer.

Install asphalt shingles roof valley.

Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. In this video i show you how i do the valleys on a shingle roof. To install asphalt shingles start by installing underlayment and new flashing on the roof.

Nail the drip edge in place using your hammer and roofing nails. No one of this affirmat. Almost 75 of roof leaks occur in valleys where two roof planes meet or at chimneys or other roof penetrations so be sure to install roof flashing in these areas prior to the start of the installation. Once you ve done that cut your shingles to size if they re not already.

As the asphalt shingles are installed over the roof deck the shingles are extended into the valley. To shingle out of the valley with laminated shingles lay a shingle down as a gauge and mark the corner at the bottom left and top right of the roof. I then move the shingle to the uppermost course on the roof plane line up the mark on the shingle with the valley center and again mark the corner. Then install a non corrosive metal valley flashing of 24 minimum width.

Install an underlayment centered in the roof valley. Install new flashing metal flashing is often called drip edge along the bottom of the roof near your gutters. Flashed open valleys may be more durable and water resistant than blind alleys in which the shingles overlap from one plane to the other and. A woven valley shingle installation has other drawbacks including that they are slow to install especially in cold weather and more difficult to repair than the other types.

In order to shingle this kind of roof valley a roofing professional has to install both roof faces at the same time which is quite slow. While the asphalt shingles will be the primary water shedding roof layer there are many benefits to installing a roof underlayment. Always install flashing around a chimney and other valleys where two roof planes meet as these areas are more prone to leaks if not protected. Roof installation how to shingle a valley hd by roofrepair101 more about roofing at.

In addition it is important to avoid nailing the shingles through the valley metal.