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I haven't seen aluminum roofing that crumbled at the edges.
I was stating my own experience.My house and 3 other nearby houses were built in 1975 and they all still have the original roofs.This is about 1000 ft from the ocean in lower Puna.They are all plantation style 2 story houses with fairly steep roof pitches.
According to HPM the Kynar coating can be applied to aluminum.
http://www.custommetalroofing.us/
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I can't explain the why of it but I have had aluminum problems at an elevation of about 800'. The aluminum screen frames on a house I own all needed replacement. They were dissolving in places. I've seen this on some aluminum roofing on edges and around nail holes too.
It may be a reaction to acid rain which happens rather rarely and ocassionally in the Pahoa area.
Ya gotta remember that ultimately everything made by man can and will be defeated by nature.
Assume the best and ask questions.
Punaweb moderator
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I can't dispute anybody's experience- just want to know what their secret is.
My ideal roof has a shallow pitch since I would have thought anything not plumb flat has to shed water as well. I thought steep pitch roofs was justb a tradition borne from snowy climate zones.
also I envision the roof as platform for pv panels hopefully.
Other people want to make friends- I just want to make money.
James Cramer
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Please consider a somewhat pitched roof. We had a heck of a time with pricing etc on a roof and gutters with a 1/12- pitch. (Thats the way it was drawn.)
Although water does run downhill, if it isn't running fast enough it appears to run uphill but it is just backing up in the traffic. Also siphoning becomes an issue.
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The Yogi,
I just spoke with HPM Custom Metal Roofing and found out that they have switched to a Duracoat Product for their coatings.
What they are now using is Durapon 70, with has the recommended 70% PVDF for the best wear-ability, but also goes a step further, with an additional Teflon coating. The Teflon coating would mean it is water safe. This coating is more scratch resistant than the Kynar and also does not get as dirty.
http://www.duracoatproducts.com/products...orocarbon/
I was told they have an exclusive agreement with Duracoat for this product in Hawaii.
Sounds like a good change!
Barbara
Hawaii Dreaming
Hawaii Dreaming
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Rob
My screens do the same thing.Any surface that is flat or can hold water corrodes away.I can double the life of my screens if I wash them once a year.
I pay extra to Dish Network for replacement insurance.So far they have replaced 2 receivers,3 remotes and the entire dish and bracket once.I can only get a year out of my desktop computer before repairs are needed.I even had a can of WD40 rust out.
My roof goes on and on though and I suspect it is because of the steep pitch and because the salt used to get washed off back when it rained on this island.
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As for the aluminum issue, here's the answer.
Aluminum degrades to Aluminum Oxide, which is sapphire, which is inert. The problem is(as in Rob's case) you have mechanical abrasion which eliminates the Al2O3 and exposes raw aluminum again. A common problem on boats. It can happen rapidly. If this is the case it will eat up like crazy. Aluminum is very corrosion resistant if, and only if, mechanical degradation can be controlled.
http://sensiblesimplicity.lefora.com/
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We just had this roofing put on our new construction home.
http://www.zappone.com/AluminumShingles.php
We wanted to use Inspire plastic roofing but it was too expensive for us.
http://www.inspireroofing.com/_homeowner/portfolio.php
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You know my ideal is the perfect square house- I call it "small box" as opposed to Walmart and Home Depot.
Also on Powerblock they finally recommended something that didn't involve boucoup bucks of aftermarket parts. To wash away rust from the radiator they backflushed it with vinegar solution. So could you "heal" abrasions in aluminum by wiping it with vinegar like bacitracin or whatever on your paper cuts?
Other people want to make friends- I just want to make money.
James Cramer
