Closed Valley Roof Flashing

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

Closed valley roof flashing.

Roofing material manufactures or roofing associations may have recommended installation guidelines for their products or for various. The following photos illustrate removal and replacement of a closed cut valley with new open metal valley shingles being removed in closed cut valley. With each new course roofing shingles continue up the valley. Valleys are created where two roof slopes meet.

All shingles removed from closed cut valley. Find out the differences before you talk to a roofing expert. To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch overlap. A closed valley is where the tiles or shingles are butted up against each other in the center of the valley.

To understand what makes a valley either closed or open it is important to understand how a valley is constructed. A closed cut asphalt shingle roof valley starts the same way as a woven valley with the first course of shingles run across the valley from both roof planes lapping the shingle from the larger or steeper roof plane over the shingle from the smaller shallower plane. There are two methods for sealing valleys. For a closed valley shingles are installed across the joint where planes intersect.

According to long time iko sales representative jeff tessaro closed valleys for residential construction have been popular since he was a roofing contractor in the late 90 s. Closed cut valleys also called closed valleys are installed quickly and have a cleaner sharper look than woven valleys. The closed variation is a flashing that has been completely covered with shingles while in the open variation will have the flashing completely exposed to the elements. Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed.

Fold the top of the flashing over the ridge and nail it off every ten inches or so along the outer edge of the flashing now this valley will carry water off the roof and away from the house. Cut bottom of flashing so the entire width of the valley flashing extends approximately 1 2 to 3 4 over the fascia trim board along eaves. Closed cut shingle valley installation. An open valley has a gap usually about 6 inches between the tile or shingles at the valley area.

Open valleys and closed valleys. Closed valleys or open valleys. One of the details that varies between homes is the method of flashing the valley areas of the roof. If you have a shingled roof as most torontonians with a sloped roof tend to have then you will have one of two kinds of valleys on your home.