Metal Flashing For Roof Valleys

There are two common methods for completing the flashing of a valley in a shingle roof system.

Metal flashing for roof valleys.

Some homeowners do not like the look of open valleys while others feel the metal accentuates the roof s shape particularly if copper or painted flashing is used. This drip edge flashing provides protection from water damage along the eaves and rake of a roof. The metal is usually pre painted to best complement the shingles color blend. To understand what makes a valley either closed or open it is important to understand how a valley is constructed.

In this video i show you how i do the valleys on a shingle roof. Closed cut valley fully replaced with new metal valley flashing. Fold the top over the roof ridge and cut the bottom along the drip edge metal. Gibraltar drip edge flashing can be used with asphalt shingles or metal roofing panels.

Punctures in the center of the valley. One of the details that varies between homes is the method of flashing the valley areas of the roof. Fasteners placed in the exposed center area. Avoid the following common errors.

Be sure to check local building codes to ensure you have the proper width for your application. That flashing is left exposed so the roof has visible lines of metal running down the valley. Valley flashings are custom fabricated to any measurements and angles and usually measure 10 in length but can also be bent in 12 lengths. No one of this affirmat.

Closed valleys or open valleys. For example in metal roofing systems valleys are commonly fabricated with hems but can also be fabricated without them in which case they could still be used for metal roofing or any other type of roofing. The extra kick at the bottom of the face directs run off away from the structure. More product details close.

Failure to extend the entire width of the metal valley flashing beyond the eave of the roof. 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. When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter. And while some homeowners may prefer the aesthetics of a closed valley the heavier and thicker the shingle the less likely it is to lie flat across a joint.

Many roofers cut the shingles across because they say it s safer. Roof mastic applied along sides of valley flashing. For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck.