Metal Roof Dormer Valley Installation

In existing homes it is most cost effective to add a dormer when a roof is being replaced.

Metal roof dormer valley installation.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. However valley flashing materials. Fold the top over the roof ridge and cut the bottom along the drip edge metal. That flashing is left exposed so the roof has visible lines of metal running down the.

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. Open valley shingle installation. Recommended procedures of basic valley flashing installation. With a clean valley you can lay down some peel and stick roofing membrane.

How to install a valley on a vicwest metal roof. Indeed california valleys are prohibited in some areas. Always be sure to refer to your local codes to see if they demand a particular kind of valley installation. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.

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. The top joinery of both valleys when they meet on the same plane of roof is shown here. W valley flashing protects the critical area of your roof where two slopes come together to form a valley. An open valley relies on metal flashing for protection.

Most dormers create valleys on either side and valleys are notorious for leaks because a higher volume of water runs through them. 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. The best time to limit the cost of a dormer is when the home is being built. Then install a non corrosive metal valley flashing of 24 minimum width.

Be sure to check local building codes to ensure you have the proper width for your application. When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter.