I received roof replacement estimate today (Toronto, Canada, 25 year
shingles), and guy told me that it is better not to use aluminum values and
just make shingles overlap where roof is changing direction. I was told it
is better practise as metal valeys tend to change size on heat/cold and
makes shingles curl.
Can anyone confirm that this is right way to go?
Metal valleys tend to clear themselves of debris better than woven or
one-cut valleys. I never had a problem with expansion/contraction
messing with the shingles in Michigan. It's more work during the
installation for the roofers, all the cuts and such. Maybe this is why
they're steering you towards the woven type? Whatever you end up with,
see if you can make sure that the roofers cut off the "ears" properly.
This is the point left at the top of the valley shingle when it is cut.
This helps keep water from catching on the point and moving sideways,
instead of down. Tom
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