How To Install Roof Valley Boards

Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.

How to install roof valley boards. Dry fix valley troughs are mortar free providing hidden water gulleys at the roof valleys. Open valley troughs have been designed as an alternative to traditional lead troughs a safe and efficient way to collect rainwater run off. Then install a non corrosive metal valley flashing of 24 minimum width lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Be sure the larger edge is laid so that the small edge of the next panel will overlap it.

In summary during the installation of a closed cut valley you install the first roof plane s shingles into the valley. Install the roofing screws vertically along each rib in the panel. As you install roof shingles on the second roof plane you allow them to lap over the valley on top of the first shingles. No one of this affirmat.

It is essential to only use whole not cut shingles during this step. In this video i show you how i do the valleys on a shingle roof. Stick on the underlayment. Place the first screw.

Peel off the bottom backing. Protect the roof against ice dams and windblown rain with self stick ice and water. Make sure the underlayment lies smooth before you nail the top edge. Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof.

Shingle the other side of the valley the same way. Soup to nuts riley shows the proper way of installing a valley on a roof. Set the angle of the circular saw blade to match the slope of your roof and run the saw along the top edge of each fascia board. Install an underlayment centered in the roof valley.

Rip the tops of the fascia boards to match the slope of your roof. Roof one side of the valley running the shingles across it. Soup to nuts riley shows the proper way of installing a valley on a roof. Making the tops of your fascia boards the same angle as the roof allows you to easily place roofing material over them without creating bumps or ridges.

Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Additional eaves closure pieces and counter battens are not required and they create a close cut appearance. Then pull off the. Many roofers cut the shingles across because they say it s safer.