Can I keep hay in a metal shed, or would it be combust?

You will probably get condensation on the underside of the tin roof which will drip onto the hay. A cheap but effective way to deal with that is to somehow suspend a sheet of plastic under the roof. I did that on my field shelter by securing builders damp proof membrane under the tin using 50mm x 12mm battens.

Or you could simply put the plastic sheet over the top of the bales stacked on pallets. Hay will quickly soak dampness up from the ground. 4x4s will last quite well stored outside provided they are kept off the ground.
 
When it gets cold condensation will form on the roof of the shed & it will drip on your hay & this will probably rot the hay. I wouldn't buy a small metal shed for that reason. You'd do alot better with a wooden one.
 
We use metal shed over here heaps. Most properties use metal sheds for hay storage.

Make sure it has ventilation, as has been said before. We store the hay on wooden pallets or on the concrete floor and unless the shed is only 3 sided, we never normally cover it. Never had a problem with hay rotting or anything. :)
 
Most of the hay sheds over here are corrugated iron, but they are usually only three sided. As NaeNae said, store it on pallets on pallets, and make sure it is well ventilated. It won't combust if the hay has been cured properly. I've stored hay through summers with an average temperature of high 30 degrees (even days of 45+) and never had anything combust!
 
Hay and straw should only heat up if it's been baled at the wrong time and is still too moist in the middle. I bought and opened a round straw last year and the heat coming out of the centre was scary. The straw was still green inside, we had to do an emergency removal to avoid a fire.
Since we now have a moisture meter and check any bales before buying.
As long as the bales are dry enough the metal shed won't make them combust.
Your problem will be as others have said condensation and ventilation.
I have a metal garden shed for feed and storage and the roof dies drip and the walls get wet inside. I left towels hanging up round the edge and they got soaked.
It's do-able but you could probably do better!
Do you have any building already that a wooden lean to type thing could be made off?
 
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