Slate Roof Valley Flashing

Using clips permits movement in the valley as temperatures change.

Slate roof valley flashing.

Missing ice water shield. Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic. Structural issues inadequate construction improper roofing methods and material deterioration. As this weak spot on your roof directs large amounts of water it is a common source for leaks.

Roof valley flashing material options there is a lot of misinformation and confusion out there when it comes to properly waterproofing roof valleys. Brent ulisky of ulisky slate demonstrates flashing a closed valley at the 2015 slate roofing contractors association 10th anniversary conference near grove. Lap successive sheets of metal flashing a minimum of 12 inches and seal laps. Whether for slate shingle or metal roofing valley flashing adds detail and helps to direct water.

Common causes of roof valley leaks. The installer fabricates simple clips or valley flashing cleats whose bent edge interlocks with the folded over or hemmed edges of the metal roof valley flashing to secure the valley to the roof deck. The cleats accommodate thermal movement in the valley flashing to prevent stress cracks. For roof pitches less then 6 per foot the flashing extends at least 12.

Intersecting roofs using a closed valley must have the same slopes so that the shingle butts line up at the valley intersection. For example in metal roofing systems valleys are commonly 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. These items can be fabricated in many different profiles. For roof pitches of 6 or more per foot the flashing extends at least 9 under the roof covering on each side.

Valley flashing is used for flashing where roof valleys are constructed. Next step is to install your starter course slate. Then install a non corrosive metal valley flashing of 24 minimum width. Use roof valley cleats at intervals of 24 o c.

The lower edge of the flashing should be held 1 2 short of the butt line of the slate tile or shingle in the succeeding course. Made with premium steel 28 gauge limited lifetime paint warranty easy to cut. Install an underlayment centered in the roof valley. A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water.