How To Do An Open Valley On A Roof

How to shingle a valley with architectural shingles.

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. First clean the debris out of the valley including sawdust nails and whatever else is in there. Fold the top over the roof ridge and cut the bottom along the drip edge metal. The open woven and closed cut methods are demonstrated.

Valleys are a prime leak area so it s important to be careful. 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. Install synthetic roofing. Then starting at the base of the valley center your first piece of flashing in the valley.

What is an open valley 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. To secure the roof valley flashing nail it down carefully. However they do not run through the complete valley area.

Do not drive nails into the flashing. Ensure ice and water protector has been installed along the valley first. This leaves a metal strip or line on the surface of the roof that serves as the valley line. Gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys.

In comparison to a closed valley an open valley adds another layer of lining into the valley. With underlayment and flashing installed apply shingles up to one side of the flashing. With a clean valley you can lay down some peel and stick roofing membrane. There are also a few options for an open valley roof.

Once the shingles are installed they don t run through the valley area. A chalk line is used to strike a line from the bottom of the valley to the top.