Roof Open W Valley Installation Instructions

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.

Roof open w valley installation instructions.

Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing. Away from the valley center just as i did with the closed cut valley. Roof valleys are like gutters with a steep pitch. 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.

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 an underlayment centered in the roof valley. Plane of the main roof.

Ensure ice and water protector has been installed along the valley first. Shingle the other side of the valley the same way. Recommended procedures of basic valley flashing installation. When i ve finished shingling the first roof plane i snap a chalkline 2 in to 3 in.

Then install a non corrosive metal valley flashing of 24 minimum width. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Roof one side of the valley running the shingles across it. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.

A valley s main function is to create runoff pathways to direct water flow from the roof planes into a valley trough. Lay one and two tab shingles as you near the valley so full size shingles will run across the valley. Stop nailing 6 inches from the center. Shingles 36 89 berkshire 36 39.

Only nail at the edges with only enough nails to. Open valleys open valleys are constructed by installing a metal lining. To secure the roof valley flashing nail it down carefully. Lutely necessary to follow a manufacturer s installation.

But the stakes are higher for valleys than they are for gutters in a previous video we covered how to flash. Then starting at the base of the. The lowest of these valley shingles is cut back at an angle in line with the lowest course line. Then i install a line of shingles up the valley with the top edge aligned with my snapped line.

Next i smear roof cement a couple of inches away from my snapped line.