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The first point to ensure the stability of a prefab house is the connection of its structure with the ground. The foundation must be designed considering the soil bearing capacity and the loads transmitted by the house structure. A geotechnical study is recommended in order to know the composition and the geological conditions of the site. The soil evaluation also permits to identify possible sub-soil circumstances, like roots or water courses, for example.

Depending on the distribution of the loads along the prefab house bearing elements (walls, piers), the foundations systems will usually be shallow, like raft foundations, linear strip footings, or localised pad footings. When the bearing capacity of the soil is not sufficient, deep solutions as micro piles can be disposed in order to transfer the loads to deeper ground layers with higher bearing capacity.

Even if the foundations can still be constructed on-site, they tend more and more nowadays to be solved with prefab elements like timber, steel or concrete piles.

Although most of the prefab houses need foundations, some, like tiny houses, lay on a platform on wheels.

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