When finished the valley and its underlayment will be completely covered with asphalt shingles.
How to start a closed roof valley.
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Keeping the cutline away from the center of the valley creates a better watercourse for runoff and tends to hide discrepancies in the line after the shingles are cut.
With a closed cut valley there s no need to shingle the two roof planes at the same time.
Generally the angle of the valley sets up a shingle joint offset of about 5 in.
Fasten the shingles about 6 inches away from the centerline on both sides.
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Roof installation how to shingle a valley hd by roofrepair101 more about roofing at.
Plus cutting the closed cut valley shingles can happen after the rest of the roof is shingled.
Use your best judgement of.
From the valley center.
Stretch it about 12 inches across the centerline.
To 5 1 2 in which is more than the minimum offset required by shingle manufacturers.
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If you are installing a closed valley the roofer will install shingles to the roof deck and extend the shingles through the valley so that it covers the entire valley area.
I work out of the valley with full shingles placing the lower corner of the shingle at the point where it crosses the valley facing edge of the starter shingles.
A closed cut asphalt shingle roof valley starts the same way as a woven valley with the first course of shingles run across the valley from both roof planes lapping the shingle from the larger or steeper roof plane over the shingle from the smaller shallower plane.
Start by laying all shingles on one side of the roofing and stretch it across the valley.
The methods taught in these video s are just a few of many ways to do construction.