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Do I have to use a slab foundation?

The structure can be built on piers or a perimeter foundation with or without a concrete slab. If a slab is poured, it is normally poured at the same time as the perimeter foundation. Many farm building plans, for instance, only require piers. If only piers are used we need to delete the base angle and use a base girt. The base girt is larger and of thicker metal which will support the sidewall sheathing without the use of a concrete foundation. The advantage of perimeter foundations is the way the building would be sealed. There is a closure strip that matches the corrugation of the panels and is inserted between the bottom of the wall panel and the base angle around the entire perimeter. This seals the building in a way that cannot be matched by a base girt or by dirt pushed up against it.