It is an area where water is directed towards rather than away from therefore correct detailing and construction is essential.
Valley detail slate roof.
The shingles or slate must lap the flashing at least 6.
Their size will vary with the length width and exposure of the slate and the slope s of the adjoining roofs.
Fabricated with hems but can also be fabricated without them in which case they could still be used for metal roofing or any other type of roofing.
The cant strip can also be constructed as shown in detail 9 5d.
Measure to see if an extra wide slate or slate and a half is required to avoid nailing into any valley flashing.
2 cut slate and a half carefully ensuring that adequate width is maintained at the tail.
Fixing sequence at mitred valley 1 lay a strip of underlay 600 mm wide over the valley underlapping the main underlay.
Open valley details for asphalt shingle roofs.
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On average north american produced s 1 rated roofing slate will cost 400 600 usd per square 100 square feet or 4 00 to 6.
Closed valley installation in detail valley flashings may be rectangular diamond or v shaped.
Valleys are a very important part of a well designed roofing system.
These items can be fabricated in many different profiles.
A common misconception is that the mortar bedding is there to prevent water access.
Two different cants are illustrated.
The valley is first lined with a thick felt paper then the copper valley pan is placed and copper nails are placed on booth sides of the pan to keep it from shifting or moving.
We sell roofing materials made from natural slate and ceramic clay tiles.
Adds detail and helps to direct water.
The detail shows a typical open valley flashing for a shingle or slate roof.
One of the areas of a pitched roof most prone to leakage if not constructed properly is the valley.
Nrca lile recommends that fasteners should not be located within 6 inches 152mm of the valley center when installing any roofing material including roll roofing and asphalt roof shingles ed.
Simply for its longevity and not to mention when installed properly its beautiful.
That being said valley s on a slate or tile roof have a pan that is placed in the center of the valley and the best material to use for these pans is copper.