Then install a non corrosive metal valley flashing of 24 minimum width.
Slate roof valley flashing.
There are many factors that can contribute towards a failure of a roof valley flashing.
For roof pitches of 6 or more per foot the flashing extends at least 9 under the roof covering on each side.
Install an underlayment centered in the roof valley.
Next step is to install your starter course slate.
Structural issues inadequate construction improper roofing methods and material deterioration.
Lap successive sheets of metal flashing a minimum of 12 inches and seal laps.
Made with premium steel 28 gauge limited lifetime paint warranty easy to cut.
Intersecting roofs using a closed valley must have the same slopes so that the shingle butts line up at the valley intersection.
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.
A properly flashed roof valley should have an ice and water shield installed with roofing felt being properly secured over the ice and water.
These items can be fabricated in many different profiles.
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.
Diagonal cuts can be made to the top corner of these slates in the valley so the pointy edge does not damage the metal.
Apply an approximately 3 inch width of asphalt roofing cement along the sides of flashing and embed shingles in mastic.
The first step to installing an open valley is to cleat your valley metal in.
Valley flashing is used for flashing where roof valleys are constructed.
For roof pitches less then 6 per foot the flashing extends at least 12.
The cleats accommodate thermal movement in the valley flashing to prevent stress cracks.
Brent ulisky of ulisky slate demonstrates flashing a closed valley at the 2015 slate roofing contractors association 10th anniversary conference near grove.
Use roof valley cleats at intervals of 24 o c.
As this weak spot on your roof directs large amounts of water it is a common source for leaks.
Whether for slate shingle or metal roofing valley flashing adds detail and helps to direct water.
Using clips permits movement in the valley as temperatures change.
