Chemically, steel is made from iron and carbon, Iron is soft and is easily cut, carbon makes the steel hard, making it more durable and strong. Different combinations of the two elements allow manufacturers to make different types of steel, and this allows them to make structures for a steel shed. As your shed design grows in size, then you would certainly want stronger steel, you can check out their grade. After your application has been approved, you should now have your roof trusses fabricated, if you don t have the tools nor the skills to do this, most lumber yards can do this for you for a minimal fee. When you have the trusses ready, you need to mark the wall of your shed to determine where the trusses will be anchored to usually an interval of 2 feet of space is done. Also, try to build a raised floor so that moisture from the ground would not easily seep inside the shed. Wet wood easily gets rotten and decomposes. With regards to the roof of your firewood shed, you should make sure in your plans that it has a high steep and is slanted. This way, snow and rain will easily slide off and would not get inside to the firewood. This will help ensure that everything is in line perfectly. Ann assistant will be most beneficial to help you hold the trusses ready. Most shed roof would use a 5/8 inch roof decking, normally plywood, to hold together the roof trusses. After screwing or nailing the plywood and the trusses, you can then cover it with either tar paper or asphalt shingles. This though would be more costly and to be honest, not too many homeowners are able to work with cement. But you can be rest assured that this, in the long run, would give you less problems and worries. It is essential though that if you decide to use a concrete slab foundation, you should know that cement soaks up water and can potentially add moisture inside your shed. Another consideration when it comes to the location is an area where water does not pool. So choose a location on higher grounds. For size consideration, this will vary depending on the size of the livestock that you plan to put inside the loafing shed. Horses are herd animals and typically gather together, so you need to put into account the size of your ponies when they grow bigger.