Re: OT-rusty barn roof

Posted by Jason - Senoia, GA on June 07, 2003 at 20:59:27 from (67.192.44.236):

In Reply to: OT-rusty barn roof posted by Dave 2N on June 03, 2003 at 04:18:34:

Dave 2N,
My uncle recently asked me the same question regarding a very large and steep roof on his barn. I have some experience with the aluminized paint on roofs that has not lasted too long - the rust bled back through.

However, in my opinion, the only reason to paint such a roof is for aesthetics - to look good. The tin will not rust through. Have you ever seen a tin roof on a house or barn rust through? The only time you will see that is if the tin is laying on the ground or has a pile of dirt on top of it. I took down a house and barn that whose tin roofs had not been painted in over 50 years and the tin was still solid.

The surface iron oxide (rust) is itself a protective layer for the metal underneath. In my profession, civil engineers are building bridges these days out of "weathering steel" for its more natural look in certain locations such as parks, etc. It is simply uncoated steel that is allowed to develop an iron oxide coating when exposed to the elements.

So, in my opinion, paint for looks but not necessarily for longevity.

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