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What do you do about electrical safety in terms of permanently and effectively grounding the roof?
How large a gound conductor do you use?
What assurance is there the roofing system can safely conduct a high voltage/high power fault current to ground (33KV)?
What about lightening protection? Since this will be the highest point of the house, and it will be electically connected (at lightening voltages) to metal within reach of the ground (leaders), what precautions are taken?
What about corosion protection?
What protection is there from damage when the roof is walked on?
My house, built in 1913, has had two roofs. The original, and one that I put on about 35 years ago. Thus, when you talk about longevity being three times asphalt, are you saying that the lifetime of a metal roof is likely to be 120 years? Do you furnish a bond to support your promises?
What is the effect of salt in the air on the roof's lifetime?
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Wow! What happened to the easy questions like "What color roof will look best with my irises when they're blooming?"
Very few metal roofs are ever grounded or installed with lightning protection. If the house is the tallest thing around and you're in a lightning-prone area, then I would sure look into it. That said, in my almost 25 years of this business, I have only known one metal roof to be hit by lightning and, in that case, there was nothing to conduct the current into the home so it ended up grounding out through the structure and even the folks inside didn't realize what had happened.
If you want to look into lightning protection, then I strongly urge you to consult with a lightning protection specialist who would be able to answer your questions.
Regarding corrosion protection -- the various metal roof products produced today have varying degrees of corrosion protection, as determined by base metal, metallic coatings, anti-corrosive coatings, paint and other finishes. Individual manufacturers can tell you how their products are protected and how they stack up against other products.
Regarding walking, there again, it depends upon the profile of metal roof. Many metal roofs rest on or close to the roof deck and can be walked just fine, depending somewhat too upon the metal thickness. Some of the heavier formed products have available contoured foam backers for extra rigidity. I would say that it is safe to say that all roof systems have been designed for walkability. Sometimes if a lot of heavy foot traffic will be on the roof, you can lay down boards on top of the roof to help disperse the weight.
For warranty and expected life information, you, again, would need to contact individual manufacturers as it will vary from product to product and producer to producer somewhat.
Your roof has done very well. It has been documented that the average life of asphalt shingles being replaced today is just 17 years.
Salt does increase the chance for corrosion. If you are in a high salt area, you will wnat to look for a product that, either through coatings and finishes or the base metal itself (such as aluminum or copper) is as corrosion-resistant as possible.
7/16/2004
Or copy this URL: https://www.metalroofing.com/spirit/comment/3473/find/7/17/2004
Or copy this URL: https://www.metalroofing.com/spirit/comment/3474/find/