Barn roof

37chief · Oct 8, 2013

I use the barn Dad stored his hay in as he sold it for my shop and storage area. It is fairly large,and has a corrigated tin roof which is rusty. The inside of the tin is like new. I was thinking of turning the tin over. The tin is the old heavy guage tin, not the home depot thin stuff. Now the new side will be good for another 50 years. I would paint it, but haven't found anything that will stick to rust. Any thoughts? Stan

GordoSD · Oct 8, 2013

Price 40 gallons of paint and rethink that deal.

MN Scott · Oct 8, 2013

If you turn it over all of the holes will be in the valleys of the corrugations. Make it more prone to leakage. Other than that it should work. I had roof painters that used to show up every few years paint my tin roofs. Big Jim and Little Jim Wells. They did a great job. Their paint lasted 10 years or more over heavy rust. They no longer show up, maybe painted themselves out of business? They used aluminum paint and mixed in black coating and spar varnish, really did the job.

casenut1 · Oct 8, 2013

I have painted several roofs like you describe.Wire brush the rust to get the active rust off of it. Then paint with a good fibered aluminum paint. It will seal around the nails and last 12- 15 years.

da.bees · Oct 8, 2013

I have had good results with phosphreic acid. Jasco is the brand I liked best. I also built a small shed from rusty signs about 20 years ago. I applyed Rustolum, 1 coat of red primer + 1 coat of yellow primer + 1 coat of white. There were a few chips and peels that needed touch up over the years but I am amazed the building still has a lot of the origional paint on it. Most other times I have used Rustolum,I was disappointed and no longer use it. I'm not sure the rate of rust would slow unless the barn condensates less than all my uninsulated ones do.

Donaldinky · Oct 8, 2013

Look for a silicone roof pant I painted my shed 8 years ago on used rusty metal. With holes seal good and still look good.

Paul from MI · Oct 8, 2013

I use fibered aluminum roof coating. Brush it on, gives 8-10 years protection. I have never cleaned off rust or wire brushed it, just painted it on.

Anonymous-0 · Oct 8, 2013

Have painted many barn roofs and or metal roofs the cost to turn that over is not going to be cheap. I have been a painter for 20 years pressure clean first with a turbo Tip first, highest psi possible if no turbo Tip with at lest a 3000 psi. This will nock a the rust and dirt off. Then use rust converter it is not cheap but you dont need much. Then red oxcide primer. Then paint with rust inhibative paint I like shercrill by sherwin Williams. If u dont do something with the rust it will just come back thru i would apply the coatings with airless sprayer should go real quick.

Ultradog MN · Oct 8, 2013

On a corrigated roof the nails are punched in to the top of the corrigation.
If you were to turn it over you'd have all the nail holes in the valley.
Someone here might suggest a way to reuse those holes but I'm thinking you would be creating a seive.

PJH · Oct 8, 2013

"Any thoughts?" you say.

I have to admit, I've briefly had the same thought, but at my age, I'd have someone build me a new barn before I'd physically tackle a project like flipping that tin over. Maybe your roof isn't as steep as ours. And then there's the little problem of the holes in what are now the ridges but will then be the valleys. Also - the edges are turned down now, and will be turned up when/if you flip the sheets. You might lose a corrigation on each sheet, making your finished roof smaller than the barn. You're more ambitious than I am Stan. My barn roof is rusty, and it'll probably stay that way, ha. Keep us posted. . .

paul · Oct 9, 2013

Paint it. The paint is spendy, but lasts 15 years or better. Aluminum and oil paint, the oil soaks into the rust, the aluminum flats to the top.

Good stuff.

You don't want the labor and holes of turning it. Just don't go there.....

Paul

Bret4207 · Oct 9, 2013

Agree with the recommendation for aluminum roof coat. Works good.

showcrop · Oct 9, 2013

Paint over rust makes it look better for awhile but the rust works faster under it because the moisture is trapped in there, instead of being cooked off on many days. You want to clean it good and apply a phosphoric acid product.

Geo-TH,In · Oct 9, 2013

I recently bought 2 used galv farm gates $20 each. Had to make repairs, worked 4 days cleaning them up, pressure washing, $20 for hinge pins, primer, rustolum paint. By the time I got done, I could have bought new gates. Still kicking myself, Big mistake.

You may want to do nothing, or take metal to recyclers and buy new.
George

Richard G. · Oct 9, 2013

I used aluminum paint about 16 years on this rusty roof and thinned it half and half with diesel fuel to make it go further and brush on easier with a long handled broom brush. Have to keep it stirred to keep it mixed with the fiber in it. I took this photo just now to show how it has lasted.
This mixture really soaks through the rust.
Richard in NW SC

Dr. Walt · Oct 10, 2013

Chief:

You might want to check out this:
http://hytechsales.com/prod2050.html

Doc

W_B · Oct 10, 2013

(quoted from post at 12:56:53 10/09/13)
You may want to do nothing, or take metal to recyclers and buy new. George

Agree with George here, if you are going to bother to take the old off just get new tin (I really like the Fabral type pre-finished stuff over the galvanized) and you have a roof you don't have to touch again for 40-50 years or so. Or paint it as suggested.

Barn roof

37chief

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GordoSD

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MN Scott

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casenut1

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da.bees

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Donaldinky

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Paul from MI

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Anonymous-0

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Ultradog MN

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PJH

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paul

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Bret4207

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showcrop

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Geo-TH,In

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Richard G.

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Dr. Walt

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W_B

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