Closed Valley Roof Flashing

Closed valleys or open valleys.

Closed valley roof flashing. One of the details that varies between homes is the method of flashing the valley areas of the roof. A closed valley is where the tiles or shingles are butted up against each other in the center of the valley. 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. 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.

For a closed valley shingles are installed across the joint where planes intersect. Open valleys and closed valleys. From the ground it looks as though the shingles meet in a clean line in the center of the valley. An open valley has a gap usually about 6 inches between the tile or shingles at the valley area.

There are two methods for sealing valleys. The following photos illustrate removal and replacement of a closed cut valley with new open metal valley shingles being removed in closed cut valley. Closed cut shingle valley installation. 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.

All shingles removed from closed cut valley. Valleys are created where two roof slopes meet. Find out the differences before you talk to a roofing expert. 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. 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. There are two common methods for completing the flashing of a valley in a shingle roof system. 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.

To splice the pieces add roofing cement to the lower piece and install the upper piece with at least a six inch overlap. Roofing material manufactures or roofing associations may have recommended installation guidelines for their products or for various. To understand what makes a valley either closed or open it is important to understand how a valley is constructed. With each new course roofing shingles continue up the valley.