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metal flashing

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Guest User
4/17/2009
Is metal flashing required in a closed valley? Or is the overlapping of the shingles enough to prevent leaks?
Nate Libbey
4/17/2009
Is this metal shingles we're talking about or asphalt shingles? As far as I'm aware, every type of metal shingle requires some type of metal valley flashing in the valleys. There could possibly be an exception, but I doubt it. If you're talking about asphalt shingles, I know they are sometimes installed by overlapping them, but I frankly don't know enough about it to be of any further help as to how to, or what would be incorrect.
Guest User
4/17/2009
Lee, Technically there is supposed to be metal under the asphalt shingles in a valley. Most roofers do not use it because it is cheaper to not use it(quite a bit cheaper). The reason for the metal in the valleys is that over time asphalt shingles shrink. That leaves a gap under them in a valley. The easiest way to access a roof is walking up the valley. You step in the valley and make a hole, then you have a leak. If there is metal under the shingles it will carry part if not all of the water to the end of the valley. I have seen homes in Fort Worth after a hail storm that entire ceilings have fell in because of the hail making a lot of holes in a valley. I have seen houses next door to the same houses that had no water damage--they had metal in the valleys under the shingles. We do not roof a home that we do not put valley metal in the valleys. Your home is a treasure--take care of it. [email protected]
Todd Miller
Isaiah Industries, Inc.
4/18/2009
Thanks!
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