I have a friend who is trying to decide on what type of new roof to
get & needs some input from roofers and/or manufacturers.
The current roof is 3 layers of 3-tab shingles on a '79 double-wide.
There is sagging (some severe) of the decking. The third roof is only
2 years old, but is already stressed & shows sympathetic cracking from
the deteriorated shingles below.
The last roof was done by a friend (not a contractor) as a birthday
She has had several roofers out & has been told that they can install
a new metal roof over what's there now; and she's been told, by
another contractor, that he will take off 1 layer of shingles &
install the metal roof.
1. I believe the decking has deteriorated to the point that it needs
to be completely replaced (part must be because of water damage)
because it will be impossible to properly install shingle or metal
with the sagging & waving.
2. If a metal roof is installed over the existing roof or over the
roof with 1 layer of shingles removed, the condition of the decking is
such that within 1-5 years, the screws, nails, or whatever is used to
anchor the metal, will release & allow the metal to act like a wing &
begin to tear itself apart in a windstorm.
3. It appears that there are several places where there may be fascia
rot and/or rotted rafter ends, behind the vinyl siding & gutters.
My recommendations to her:
a. Remove the existing roofing & decking, repair any rotted fascia
boards and rafters, re-deck & install new roofing of choice over that.
b. I advised her that she was wasting her money and that any
manufacturer's warranty would probably be void due to improper
installation - if the substrate was not repaired.
Where she is now:
She's got different roofers telling her their work/product will solve
She's got family & friends giving her different advice & guidance.
Your help is requested:
If any roofing contractors and/or manufacturers would care to reflect
on this post, she's agreed to follow your suggestions.