W valley flashing protects the critical area of your w valley flashing protects the critical area of your roof where two slopes come together to form a valley.
Roofing open valley nail through metal.
Looking into all the options the benefits made the investment worth it.
If there are gutters installed on the eaves the eave flashing should be installed to overhang the lip of the gutter by about 1 2 inch.
And speaking of nails they shot nails through the eves that are clearly visible and truly unsightly.
Exposed nail heads on the roof were left without caulking.
Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.
Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.
With a metal liner nail 1 2 inch outside the liner.
I encourage people to at least investigate metal.
Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.
The correct way to fasten steel panels with nails is to drive the nail through the top of the rib so the washer is compressed securely against the metal.
With a clean valley you can lay down some peel and stick roofing membrane.
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Roof one side of the valley running the shingles across it.
Use 1 1 4 inch nails to cover the outline of the roof with strips of metal eave flashing also called edging.
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Shingles should overlap the valley lining by at least 6 inches.
But the shingles seem to be nailed through the metal about 6 outside the bottom of the valley which contradicts the no nailing through the metal.
Over driving the nail can split the washer and dimple the metal causing leaks.
When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter.
Stop nailing 6 inches from the center.
With a roll roofing valley keep the nails at least 6 inches from the valley centerline.
Seal each shingle to the liner and overlapping shingle with a 3 inch wide bead of plastic roofing cement.
Snap a chalkline 2 to 3 inches past the valley center on the top layer of shingles.
Nail placement must be in the ribs for roofing ap plications to minimize the potential for roof leaks.
Fold the top over the roof ridge and cut the bottom along the drip edge metal.
Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.
Clip the top corner of shingles along valleys to keep water flow toward center of valley.
Most state to use clips on the long sides of the valleys to allow the metal to expand contract as needed and to not nail the metal in place.
