Open Closed Valley Roof

For an open valley a sheet of metal usually steel sometimes copper is fastened to the roof deck.

Open closed valley roof.

The metal is usually pre painted to best complement the shingles color blend. Closed valley before you install a shingle roof the contractor will install an underlayment over the entire roof deck. 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. Woven closed cut and open.

Since the area is covered by shingles the closed valley makes the roofing system more appealing when seen from the ground. Water collects in a valley to flow off the roof. About open roof valleys. A roof valley is formed where two roof slopes meet.

An open valley has a gap usually about 6 inches between the tile or shingles at the valley area. 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. Roofing shingles are installed then cut and sealed where they overlap the metal channel. This valley flashing material can be manufactured from any metal that will resist the effects of weather acid rain and other contaminants.

After the self adhering underlayment is installed across the valley a pre bent metal valley lining is installed. The roofers apply the shingles cutting and sealing the ones that overlap the metal. The self adhering section acts as the lining for 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.

This leaves a metal strip or line on the surface of the roof that serves as the valley line. The only type of valley that is unacceptable is the woven valley. Although the open valley is recommended by the manufacturer closed valley is acceptable. Once the shingles are installed they don t run through the valley area.

In comparison to a closed valley an open valley adds another layer of lining into the valley. Your choice of valley installation method is critical because when improperly installed valleys are risks for serious leaks. 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. Part of the underlayment includes a self adhering ice and water shield that a heavier gauge than the rest of the underlayment.