Metal Roof Dormer Valley Installation

W valley flashing protects the critical area of your roof where two slopes come together to form a valley.

Metal roof dormer valley installation.

Most dormers create valleys on either side and valleys are notorious for leaks because a higher volume of water runs through them. Install an underlayment centered in the roof valley. How to install a valley on a vicwest metal roof. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.

Open valley shingle installation. However valley flashing materials. Indeed california valleys are prohibited in some areas. Fold the top over the roof ridge and cut the bottom along the drip edge metal.

Be sure to check local building codes to ensure you have the proper width for your application. Then install a non corrosive metal valley flashing of 24 minimum width. The top joinery of both valleys when they meet on the same plane of roof is shown here. That flashing is left exposed so the roof has visible lines of metal running down the.

In existing homes it is most cost effective to add a dormer when a roof is being replaced. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Always be sure to refer to your local codes to see if they demand a particular kind of valley installation. The best time to limit the cost of a dormer is when the home is being built.

A house with an l shaped or t shaped footprint for example always will have roof valleys where the two sections of the house meet. With a clean valley you can lay down some peel and stick roofing membrane. I have my valley custom made with water trough to help with leaking b. Valleys are typically found where gable dormer roofs meet the main roof or when a house has angled wings or additions where two roof sections in different planes meet.

An open valley relies on metal flashing for protection. When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter.