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Rusty Metal Roof

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Gary Schafer

02-21-2004 09:25:04

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I have a couple of buildings with the old corrugated metal galvanized roofing. It is getting pretty rusty. It is over 60 years old. Still in good shape but rusty on the outside. Looks bad. Underneath it looks like new.
I thought of flopping it over but then the nail holes would end up in the bottom of the ridge rather than on the top.

Has anybody ever painted / coated rusty roofing? Or is it best to just put new stuff on?

Thanks
Gary Schafer

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Nolan

02-24-2004 06:10:26

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Re: Rusty Metal Roof in reply to Gary Schafer, 02-21-2004 09:25:04

I repainted the metal roofs on my sheds and part of my house several years ago. Treated them like I would a rusty car fender. Cleaned them, used a rusty metal primer, and a gloss Rustoleum enamel paint. It's been several years now, and the roofs look fine.

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kyhayman

02-21-2004 17:10:57

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Re: Rusty Metal Roof in reply to Gary Schafer, 02-21-2004 09:25:04

I really like a roof painted with an aluminum paint, think they look sharp and it really lasts. The past 2-3 roofs I have had done I got them painted black just like the rest of the barns. It's been 5 years and I can see some rust coming through but for the price I'll probably go back to black. Black paint has been $115 for a 55 gallon barrel and the good aluminum is $40 a gallon. Guys with the paint rigs are charging me $350 ($500 if they do the roof too) a barn (36x72x18) including roof to spray black plus the paint.

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02-21-2004 14:21:40

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Re: Rusty Metal Roof in reply to Gary Schafer, 02-21-2004 09:25:04

A man I known told me that when he bought his house the roof had some rust starting to come through so painted it with an aluminum asphalt base paint.Its now 30 yrs later and he was going to do it again. He said he bought the paint in a 5 gal can. I know that 30 years ago all the roof flashings were 28 guage and that now because of competition most contractors use lighter 30 guage. So perhaps the older tin roofs were heavier than now. However if you keep them painted they should last a long time. I touched up the metal roof on my shed but I cleaned it off first because there was a layer stuff on it probably from nearby trees. I also wire brushed the rust.

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Larry

02-21-2004 16:32:46

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Re: Re: Rusty Metal Roof in reply to Al, 02-21-2004 14:21:40

I have painted metal roofs in two ways--

if there were spots through I use Sherman Williams asphalt al. paint

if it is rusty I use a DTM paint from S-W--You spray it on with out any prep --I have had it on for 10 years and plan on repainting this year.

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Hayman

02-21-2004 12:07:16

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Re: Rusty Metal Roof in reply to Gary Schafer, 02-21-2004 09:25:04

I had a rusty galv. iron roof,I waited for a warm day and spray painted black oil-based paint on it right over the rust!!Still looks good after 5 years. Go for it.

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buck

02-21-2004 12:01:58

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Re: Rusty Metal Roof in reply to Gary Schafer, 02-21-2004 09:25:04

I have some of the same stuff on an old barn which has a fairly uniform coat of rust which I like so it will remain so. My old house had the same which I repaced against the advice of good roofing contractor. He was correct in that I should have painted/coated the old roof. I used the old metal roofing from my house for a pole barn. I just turned it over and calked up the holes but still haven't found them all. The "cool seal" type products are good straight over your rusty roof. Take a piece of garden hose about 6'long and give the roof a good whipping (vibration) sweep it off and apply the cool seal with a long (1") nap roller.I like using a 5 gallon bucket and bucket tray. Start at top and work down the roof as this stuff likes to run and you can adjust your application speed to the degree of running of the cool seal. The slower the application the thicker the coat and the fuller the V of the corrugation will be. Figure on he application to cover about 2/3 of that listed on the product. Make sure anything that you don't want speckled with the product is a long way away.

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Wes

02-21-2004 11:10:03

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Re: Rusty Metal Roof in reply to Gary Schafer, 02-21-2004 09:25:04

Having many years expirence in the steel / pole / general construction trade, I have found two answers - paint and petroleum based sealant - just what the other posts said. The best paint that I had used on steel siding & roofing was a Sherwin-Williams B55 "Direct to Metal" enamel. Very nice product. The mobile home roof sealant is marketed under a trade name of "Kool-Seal" "CoolSeal", "etc."

I found one contractor who had purchased equipment just for painting roofs. He said he had to have the equipment to compete with the Amish, and that he was able to do so. Maybe look for roof painting equipment companies, then ask who has purchased equipment in your area?

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T_Bone

02-21-2004 10:33:00

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Re: Rusty Metal Roof in reply to Gary Schafer, 02-21-2004 09:25:04

Hi Gary,

Gempler's carry's a product that they advertise to eliminate the rust and primer the surface. The pictures are impressive but I've never used the product.

Vinegar disolves rust and pre-etchs glavanize for painting. The black oxide is then removed with water then painted or oiled afterwards. Soak something rusted in vinegar and see what I mean.

If you buy/make undeluted vinegar then I would bet it would work very fast. The 5% solution at the store works slow.

T_Bone

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Kirk

02-21-2004 10:18:54

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Re: Rusty Metal Roof in reply to Gary Schafer, 02-21-2004 09:25:04

I think that is the Aluminized roof coating that is used on mobile homes.

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Mac

02-21-2004 10:04:43

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Re: Rusty Metal Roof in reply to Gary Schafer, 02-21-2004 09:25:04

Son had a roof like that several years ago, we wire brushed what we could and used some type of thick alum. colored coating stuff. It held up decent. The product name escapes me now, maybe some one else will know what I have in mind.

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