Closed Valley Roof Flashing

Closed cut shingle valley installation.

Closed valley roof flashing.

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. Valleys are created where two roof slopes meet. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. Because of the sheer amount of water being navigated through this section your valleys need to be properly sealed.

From the ground it looks as though the shingles meet in a clean line in the center of the valley. There are two common methods for completing the flashing of a valley in a shingle roof system. 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. A closed valley is where the tiles or shingles are butted up against each other in the center of the valley.

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. Find out the differences before you talk to a roofing expert. There are two methods for sealing valleys. 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.

From drip edge to valley flashing december 25 2018 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. One of the details that varies between homes is the method of flashing the valley areas of the roof. 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. One layer of shingles actually crosses the valley beneath the other.

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. Open valleys and closed valleys. For a closed valley shingles are installed across the joint where planes intersect. With each new course roofing shingles continue up the valley.

All shingles removed from closed cut valley. Closed valleys or open valleys. An open valley has a gap usually about 6 inches between the tile or shingles at the valley area. To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch overlap.