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Tool Talk Discussion Forum

Metal sheeting corrosion

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farmermatt

02-17-2008 16:10:52




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Im look at purchasing a large unassembled machine shed at an auction. The seller died a week after the building was delivered to the site. It has been sitting out in the weather since aug 07. everything is on planks and out of the dirt. The sheeting for the side walls is painted, the roof is galvanized. What corrosion risk is there within the bundles of sheeting. Plenty of snow this winter for moisture. Anyone with experience here??? Thanks alot in advance
Matt

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T_Bone

02-19-2008 04:44:20




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 Re: Metal sheeting corrosion in reply to farmermatt, 02-17-2008 16:10:52  
Hi Matt,

I wouldn't have a problem with the sheets. You will probably find some oxide corrosion but probably not a lot and certianly not enough to hurt the sheeting.

Use vinegar on the oxide spots then spot paint with "cold galv"

If I was going to let the sheeting sit much longer then I would take the time to dry each sheet, patch the oxides, then dry store it.

T_Bone

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Dave Sherburne NY

02-18-2008 09:42:52




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 Re: Metal sheeting corrosion in reply to farmermatt, 02-17-2008 16:10:52  
If it sat out in the weather that long, moisture
has wicked between the sheets When you look at the
inner sheets they will show the "white rust".
After you put them on the building, they will rust
faster than if you got them right from the factory
and put them on the roof. That said, I am not impressed with the galvanized coating they put on metal roofing these days it lasts no where near as
long as what was used 50 years ago. If you can get
it cheap enough,and it isn't in to bad shape, do it
and figure on coating it after a few years.

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Bendee

02-18-2008 05:53:20




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 Re: Metal sheeting corrosion in reply to farmermatt, 02-17-2008 16:10:52  
I had shed sitting for 2 years, gal roofing painted zincalum walls.Few white patches but ok now erected. Delve down into the stack and look.



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MarkB_MI

02-17-2008 18:33:33




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 Re: Metal sheeting corrosion in reply to farmermatt, 02-17-2008 16:10:52  
Back in another life I used to erect steel buildings. I remember that the manufacturers were real adamant about not stacking wet galvanized sheets. They weren't worried about painted sheets.

Any corrosion on the galvanized is likely to be cosmetic. Since you normally can't see the roof, I wouldn't be too worried about it.



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glennster

02-17-2008 17:00:25




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 Re: Metal sheeting corrosion in reply to farmermatt, 02-17-2008 16:10:52  
the galvanized will probably have white rust on it. the sheets will wick water and hold it insider. it will eat thru the galvanized coatings and start the steel panel to rust. take about a half of dozen sheets off the stack and see what the inners look like. if they have big splochy areas that look like baking soda, its white rust. then the panels will have to be painted.



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bellyacre

02-17-2008 16:50:12




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 Re: Metal sheeting corrosion in reply to farmermatt, 02-17-2008 16:10:52  
Painted panels should be OK. I would be more concerned about the galvanized panels if they have moisture between them. Its not been so long that they would be rusty but they could be stained somewhat. This won't hurt anything, A couple of years in the sun you probably won't even notice it, depending on how much moisture is involved



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NE IA

02-17-2008 16:28:28




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 Re: Metal sheeting corrosion in reply to farmermatt, 02-17-2008 16:10:52  
Probably a fair amount. Call the company that makes the steel, they can help you. Look on the rib on inside of panels and give them the date / code. Some companies are much better than others for moisture damage. I assume the panels were stored the correct way, doubt if they were upside down now that I think about it.



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farmermatt

02-17-2008 16:49:20




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 Re: Metal sheeting corrosion in reply to NE IA, 02-17-2008 16:28:28  
The painted metal was store on a slight slope, galvanized was level. All of it is off the ground and bundled tight. Im sure no one wants the bundles opend up but maybe ill have to take some snips and break em open to see if any is evident. only been 6 or 7 months but hate to spend alot on something thats gonna need painted right off the bat.



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