Metal Roof Dormer Valley Installation

The ridge flashing on the dormer covers the end of the valleys at the peak and tucks under the main roof.

Metal roof dormer valley installation.

Then install a non corrosive metal valley flashing of 24 minimum width. Place this in the valley on each side of a gable roof one edge laid on the gable roof with the other side nailed flat on the. How to install a valley on a vicwest metal roof. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.

The top joinery of both valleys when they meet on the same plane of roof is shown here. Fold the top over the roof ridge and cut the bottom along the drip edge metal. Recommended procedures of basic valley flashing installation. Cut it about 6 long and it will have to be cut in the bend from where it comes into contact with the main roof the extra 6.

In summary during the installation of a closed cut valley you install the first roof plane s shingles into the valley. Open valleys on the other hand leave the metal exposed which may be more pleasing to the eye especially if copper is used as the valley lining. However valley flashing materials. I have my valley custom made with water trough to help with leaking b.

Install metal flashing at every dormer roof to main roof connection. Applicable for ultravic supervic 7 8 corrugated barnmaster diamond rib double. Drip edge metal valley flashing dormer chimney and kick out flashing shed water away from the connections between roofs walls chimneys and other building assemblies this collection of 18 articles animations and videos identifies the critical roof flashing areas illustrates durable roof flashing details and shows how to flash roofs. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.

Install an underlayment centered in the roof valley. This will reduce the installed cost of the project especially if there is a significant number of valleys in the roof system being installed. As you install roof shingles on the second roof plane you allow them to lap over the valley on top of the first shingles. With a clean valley you can lay down some peel and stick roofing membrane.

Most dormers create valleys on either side and valleys are notorious for leaks because a higher volume of water runs through them. In existing homes it is most cost effective to add a dormer when a roof is being replaced.