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white tin versus steel Toplef10white tin versus steel 1zd3ho10

Hello Guest!
Welcome to the official Square Foot Gardening Forum.
There's lots to learn here by reading as a guest. However, if you become a member (it's free, ad free and spam-free) you'll have access to our large vermiculite databases, our seed exchange spreadsheets, Mel's Mix calculator, and many more members' pictures in the Gallery. Enjoy.

white tin versus steel I22gcj10white tin versus steel 14dhcg10

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white tin versus steel

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white tin versus steel Empty white tin versus steel

Post  has55 4/18/2020, 7:51 pm

do anyone know how longs these beds will last, resist corrosion?


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white tin versus steel Empty Re: white tin versus steel

Post  OhioGardener 4/18/2020, 8:20 pm

I assume what he is referring to a tin is really painted steel, which is what my pole barn is built out of. It is durable, but not as durable as zinc plated corrugated steel, which is what my hay barn is built out of. If the painted steel gets scratched, it quickly rusts. And the roof on my pole barn, which is 30 years old, has almost no paint left on the steel and needs to be replaced.  The zinc coated corrugated steel on the hay barn, which is 41 years old, is still very good looking with very little rust.  I would tend to think that the corrugated steel would be stronger and less likely to bow out under the weight of the soil than the sheet steel would be.

My raised beds are all zinc coated corrugated steel and are not showing any rust or corrosion to date. Some of them are 5 years old, and some of them are 3 years old.

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white tin versus steel Empty Re: white tin versus steel

Post  plantoid 4/19/2020, 1:37 am

Soil acids against the metal will eat into the zinc on the wriggly tin ( zinc electro plated corrugated steel ) in five or six years unless you paint it in a bitumastic black paint . When used for shed walls & roofing  it has about a 10 yr warrantee. ( Unless it comes from China ....then think of five years if you're lucky .)  


 The profile sheet stuff looks like electro  zinc plated steel sheet that has been sprayed with a plastic coating on both sides ( Called Plastisol here in the UK  usually has a 30 yr warrantee on panelling & roofing above the ground  ) and should if the stuff buried in the soil when I came to live here is anything to go by remain sound for over 12 years when soil is against it . Sometimes it is nice & smooth on the outer face , sometimes it's grained like leather .

  But  if you pierce the plastic coating either side of the profiled sheet the zinc becomes exposed to soil acids and eventually the acids burn microscopic holes in the zinc plated coating  where rusting will slowly but surely occur.


I constructed two specialist small mammal  breeding sheds  using portal frames & 1/8 inch thick purlins , one barn was 20x 40 by 18 feeet high . the second 40 x 80 pex roof at 10 foot to the guttering . Both were done using the plastisol sheeting .


Where the guy uses the small hand dis cutter to cut the sheets,  
A.
A tessellated cutting wheel is not as safe or as good as a full/solid  circumference diamond impregnated wheel . As the latter cannot get caught up  on the sheeting plus it leaves a better cut edge.  An electric heavy duty nibbler  leaves thousands of tiny razor sharp edges per foot of cut so don't use one if at all possible  ( Guess how I know ? Embarassed .)

B. 

Any cut edge  will have left a mild steel exposed edge . paint them with single bitumen coat to seal both top & bottom edges .

C.
  If you can locate a place where they fold or roll  the flat sheets to the Plastisol profile they will usually cut all the sheets on the massive metal guillotine to the right size before they roll or press the profile on the sheets .


D. 
The corner pieces are called corner capping's here in the UK 

E.
 Years ago in the USA you used to have , " The Alumining Men "  come along and cover the old wooden clapboards in profiled pimpled aluminium sheet  that was also spray plastic covered ... . that stuff re purposed  was used by my FIL in Canada for his 15 yrs of SFG style veg beds at their place in St Katherins Ontario Canada .
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white tin versus steel Empty Re: white tin versus steel

Post  has55 4/19/2020, 9:40 pm

thanks to both of you. I needed that info.
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