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I am a homeowner looking to replace my roof in Florida. Last year I was able to escape any damage, however, this hurricane season has me concerned. Now, I have heard that metal roofs are more wind proof than other roofing materials, is this true? Why? Also, I have seen some metal roofs in my area and after last year's hurricanes they have some edge trim damage. I have even seen some where the edge trims have blown off. Is this preventable? Any information you are able to provide would be greatly appreciated.
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In simple terms a 100mph wind exerts 31psf pressure most metal roofing has a screw fastener every 2 sf with each holding 500 lbs. Do the math. Metal also has certain strength and flex properties so it can resist the wind better as well. Choose a product you like and then check to see if it is approved for the HVWZ in their FL report which means it has been tested for wind uplift. Our Signature Series product line has been tested for for over 110 psf.
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Allan, I am going with an exposed fastener metal roof (3 ft. 26 ga wide panels, 3/4" tall ribs Ash Grey color. My panel lengths are max 23 ft. long (running from eave edge at fascia to ridge). I will be strapping with 1x4 purlins every 2.5 ft. and screwing per manufacturer's recommendations (every 9" across panel width). My question is will I encounter any issues due to thermal expansion of panel this length? One experienced industry rep noted that 20 ft. was about the maximum length before thermal expansion is more of an issue for an exposed fastener roof. He recommended considering a white roof as the solar reflectance would keep the metal cooler. One installer told me that he has seen chafing under the washers that wears a hole where the screw is. What is your take on this?
PS My existing shingle roof was fatally damaged by Katrina (many shingles and felt removed on windward side), and I am impressed with metal's strength over the long haul, as indicated in your 'do the math' posting.
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Metals expand and contract. The forces beceome greater at greater length but even in short lengths, that expansion and contraction can work on fasteners and fastener holes.
Many residential metal roofs have either "clip" fasteners so that the metal panels themselves can "float" or else some have "pleats," if you will, in how the metal is formed, which allows for an accordian effect to permit expansion and contraction.
It sounds like you are considering a through-fastened panel ... those panels really do not have allowance for expansion so, yes, the fasteners and fastener holes are "worked on" over time. I have seen many of them last a very long time though. My company had an old 5V Crimp roof on a building we'd purchased which we wnated to change out to one of our products. I am guessing the 5V was well over 25 years old at the time but yet it was just fine when we removed it.
Yes, a lighter color will help some but, realistically, probably not all that much.
6/7/2005
Or copy this URL: https://www.metalroofing.com/spirit/comment/6029/find/Dura-Loc Roofing Systems, Inc.
6/7/2005
Or copy this URL: https://www.metalroofing.com/spirit/comment/6030/find/2/22/2006
Or copy this URL: https://www.metalroofing.com/spirit/comment/6031/find/Isaiah Industries, Inc.
2/23/2006
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