Roof Open W Valley Installation Instructions

Valley constructions 14 open valleys 15 shingle application 16 flashing details 19 24 flashing against vertical sidewalls 19 flashing around chimneys 20 roofing ventilation 25 27 proper ventilation.

Roof open w valley installation instructions.

Open valleys open valleys are constructed by installing a metal lining. Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles. Install the roofing screws vertically along each rib in the panel. Roof one side of the valley running the shingles across it.

W type valley flashing is more rigid for handling so it stays straight and it stops waler rushing down one side of a roof from rushing back up the other side. A valley s main function is to create runoff pathways to direct water flow from the roof planes into a valley trough. Next i smear roof cement a couple of inches away from my snapped line. Install an underlayment centered in the roof valley.

Away from the valley center just as i did with the closed cut valley. The volume of water varies with the valley s length and slope. Intake low exhaust high 25 roofing failures 28 30 how to estimate roofs 31 35 installation instructions. Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.

Plane of the main roof. Roof valleys are like gutters with a steep pitch. Only nail at the edges with only enough nails to. Then starting at the base of the.

Ensure ice and water protector has been installed along the valley first. To secure the roof valley flashing nail it down carefully. Lutely necessary to follow a manufacturer s installation. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.

Then i install a line of shingles up the valley with the top edge aligned with my snapped line. Stop nailing 6 inches from the center. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Be sure the larger edge is laid so that the small edge of the next panel will overlap it.

But the stakes are higher for valleys than they are for gutters in a previous video we covered how to flash. The lowest of these valley shingles is cut back at an angle in line with the lowest course line. Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof line. Shingle the other side of the valley the same way.

Then install a non corrosive metal valley flashing of 24 minimum width.