Open Closed Valley Roof

The metal is usually pre painted to best complement the shingles color blend.

Open closed valley roof.

This valley flashing material can be manufactured from any metal that will resist the effects of weather acid rain and other contaminants. An open valley has a gap usually about 6 inches between the tile or shingles at the valley area. Although the open valley is recommended by the manufacturer closed valley is acceptable. Water collects in a valley to flow off the roof.

Closed valley before you install a shingle roof the contractor will install an underlayment over the entire roof deck. Essentially there are three main ways to shingle a roof valley. For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck. 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.

The only type of valley that is unacceptable is the woven valley. An open roof valley meanwhile is a flashing method in which a sheet of pre bent metal is installed after the valley lining is placed. Once the shingles are installed they don t run through the valley area. The roofers apply the shingles cutting and sealing the ones that overlap the metal.

In comparison to a closed valley an open valley adds another layer of lining into the valley. Open roof valley this is almost the same as the closed roof valley method except a pre bent metal valley lining is installed instead of a secondary roof underlayment. A closed valley is where the tiles or shingles are butted up against each other in the center of the valley. Part of the underlayment includes a self adhering ice and water shield that a heavier gauge than the rest of the underlayment.

After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. The self adhering section acts as the lining for the valley. Since the area is covered by shingles the closed valley makes the roofing system more appealing when seen from the ground. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks.

About open roof valleys. 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. This leaves a metal strip or line on the surface of the roof that serves as the valley line. A roof valley is formed where two roof slopes meet.