After Wilma I walked around and saw all types of roof damages. The only
types that seemed undamaged are metal roofing, something like this:
and flat roof tiles like this:
Barrel roof tiles seem to always get blown or shifted at the bottom or along
the ridge. Shingles - nothing is left. I have barrel tiled roof now and
has been for about 10 years so may be due for replacement.
Any idea the cost comparison between metal roof and flat tile roof? I heard
stories about rain falling on metal roof can be very loud and annoying. Any
pros and cons?
Shingles are generally rated only for 60 mph, and from some
manufacturers up to 110 mph if fastened with six nails per shingle.
The failure mode for tiles has more to do with the attachment method.
After Andrew the only approved attachment system for Miami / Dade was
http://www.polyfoam.cc/products/roof/polyset.html (When I reroofed two
years ago with flat tiles I used this system).
Metal roofing is good too if properly installed, but as you noted it can
be noisy and in salt air environments, prone to rust. Cost is slighly
higher than good quality tile.
Before reroofing, read this -
I'd highly recommend installation of hurricane straps (if you don't
already have them), adding gable-end bracing if you have that type of
roof, renailing all your sheating, installation of a secondary water
barrier, the use of modified bitumen as the cap sheet in your
underlayment system, and Polyfoam attachment of the tiles. Get the job
done right and you'll have a roof that can withstand a Cat 5 storm.
Note however that it will still likely be badly damaged by wind borne
debris from your neighbor's homes.
Looks like a good product. Note that only the Gerard Canyon Shake
product meets uplift requirements for a Cat 5 in the HVHZ.
I have an 80 year old slate roof that has been through hurricanes but we
don't get as high winds here in PA as folks down in hurricane alley do
so I'm not sure how well slate would hold up in extreme wind conditions.
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