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.
Roofing open valley nail through metal.
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Install synthetic roofing underlayment or felt paper according to manufacturer specifications and then install the first piece of valley flashing.
Shingle the other side of the valley the same way.
Place corner pieces where panels will meet bends at the edge of the roofing.
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.
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.
Shingles should overlap the valley lining by at least 6 inches.
Clip the top corner of shingles along valleys to keep water flow toward center of valley.
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With a metal liner nail 1 2 inch outside the liner.
Stop nailing 6 inches from the center.
Seal each shingle to the liner and overlapping shingle with a 3 inch wide bead of plastic roofing cement.
And speaking of nails they shot nails through the eves that are clearly visible and truly unsightly.
Nail placement must be in the ribs for roofing ap plications to minimize the potential for roof leaks.
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Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.
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.
First clean the debris out of the valley including sawdust nails and whatever else is in there.
Over driving the nail can split the washer and dimple the metal causing leaks.
Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.
Exposed nail heads on the roof were left without caulking.
With a clean valley you can lay down some peel and stick roofing membrane.
With a roll roofing valley keep the nails at least 6 inches from the valley centerline.
Lay one and two tab shingles as you near the valley so full size shingles will run across the valley.
I encourage people to at least investigate metal.
When properly installed w valley flashing will reliably channel run off water down the roof and into the gutter.
Use 1 1 4 inch nails to cover the outline of the roof with strips of metal eave flashing also called edging.
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.
