<< Is it possible to install a metal roof over one layer of asphalt shingles?
Quite possible, but not necessarily desireable. Have you discussed it with an
installer or manufacturer? That should be your first step HTH
Anything's "possible" I guess, but in my recent experience,
I was advised by every contract estimator to have the
shingles removed, and one said he could not honor his 30 yr
warranty if I insisted on doing it that way.
The most convincing arguements, to me, were:
-- Replacing rotted, wet, molded, dry-rotted or unfastened
(due to freeze/heat seasons) wood would never be something
you could be sure of.
-- Likely some shingle bleed-thru would be visible under
the steel, esp along the overlapping edges because of the
double-strength there and not elsewhere in the panels.
-- Compressibility of the shingle materials could result in
loosening fasterners (n ail-screws) over time. It might
also make the roof noisy at sunrise/sunsets (you tell me why
& we'll both know).
No idea whether it's a climate thing or not - we go well
subzero in the winter & up to 100's in summer, with very wet
springs & falls. I love the sound of rain on metal, hate
having to keep up the lightning rods etc, & snow/ice sure
slides off it well. But, we ended up with shingles.
Cheaper. Go figure. I wanted a sky-blue metal roof -
didn't get it - that color looked awful in shingels <g>.
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