How To Do An Open Valley On A Roof

This valley flashing material can be manufactured from any metal that will resist the effects of weather acid rain and other contaminants.

How to do an open valley on a roof. Fold the top over the roof ridge and cut the bottom along the drip edge metal. Valleys are a prime leak area so it s important to be careful. Once the shingles are installed they don t run through the valley area. How to shingle a valley with architectural shingles.

Gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys. This leaves a metal strip or line on the surface of the roof that serves as the valley line. Then starting at the base of the valley center your first piece of flashing in the valley. In comparison to a closed valley an open valley adds another layer of lining into the valley.

There are also a few options for an open valley roof. Ensure ice and water protector has been installed along the valley first. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. With a clean valley you can lay down some peel and stick roofing membrane.

Then shingles are cut out of the valley area which opens the surface for the metal lining to carry water off the roof. Open valley shingle installation makes use of the metal flashing sheets that need to be installed so that they overlap each other by few inches with the upper piece of sheet is resting over the bottom piece. Do not drive nails into the flashing. Open roof valley this is almost the same as the closed roof valley method except a pre bent metal valley lining is installed instead of a secondary roof underlayment.

The open woven and closed cut methods are demonstrated. However they do not run through the complete valley area. With underlayment and flashing installed apply shingles up to one side of the flashing. Install synthetic roofing.

How to do it. What is an open valley roof.