Hi folks, we got our quotes for steel roof and need your opinion.
The company is Hy-Grade and will instal a wooden grid (sort of like
furring) on top of existing ashphalt shingles, and on the grid will put
the steel shakes. These are PVC coated and shaped in a way that helps
combat metal expansion due to changing temperatures. The metal roof
will be about 3" over the existing roof wich allows for air circulation
(see image: http://www.hygraderoofing.com/images/pic_6.jpg
leaving old shingles has 3 main advantages:
Sound proofing - Heat control - Moisture control.
The rep assures us that air ciculating between the old and new roof
prevents condensation on the inside of the metal shakes. But... The
company's 10-point disclaimer devotes 2 points to inform customers that
Hy-Grade will not be responsible for damage caused by moisture due to
heat loss causing ice dams or condesation and that they will not be
responsible for the growth and spread of mould.
I'm wandering if you have any opinions on metal roofing in general and
the mentioned disclaimer points in particular.
I will add that the cost of the roofing is 9,000 for Steel vs 4,500
for regular shingles canadian (8,200 vs 3,900 USD), so quite attractive
to us given the 50 year warranty.