How To Do An Open Valley On A Roof

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.

How to do an open valley on a roof.

Gaf mastering the roof chapter 12 this video demonstrates the proper installation technique for installing roofing valleys. Ensure ice and water protector has been installed along the valley first. This valley flashing material can be manufactured from any metal that will resist the effects of weather acid rain and other contaminants. In comparison to a closed valley an open valley adds another layer of lining into the valley.

What is an open valley roof. Install synthetic roofing. This leaves a metal strip or line on the surface of the roof that serves as the valley line. A chalk line is used to strike a line from the bottom of the valley to the top.

Do not drive nails into the flashing. However they do not run through the complete valley area. How to do it. First clean the debris out of the valley including sawdust nails and whatever else is in there.

The open woven and closed cut methods are demonstrated. 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. After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. To secure the roof valley flashing nail it down carefully.

Fold the top over the roof ridge and cut the bottom along the drip edge metal. Once the shingles are installed they don t run through the valley area. With a clean valley you can lay down some peel and stick roofing membrane. Valleys are a prime leak area so it s important to be careful.

With underlayment and flashing installed apply shingles up to one side of the flashing. Then starting at the base of the valley center your first piece of flashing in the valley.