Crawl space foundations have two major characteristics: they incorporate a wall that covers the entire perimeter with internal, independent support points.
Crawl spaces are typically used where a traditional site-built foundation is expected. Crawl spaces have many different designs, but only one has worked effectively for manufactured homes¹.
The crawl space foundation designed for manufactured homes is made of an excavated floor and is typically built using poured concrete footers that go into the soil and anchor the home down. The manufactured home frame rests on a perimeter wall and is supported by piers strategically placed for support points, which are customized per each home.
Sometimes, Block Crawl Space Perimeter Enclosures are also used to meet building requirements. For this foundation, a pier and beam set with concrete pads and a concrete perimeter is created for the footers. After the home is set up on the piers, blocks are installed around the outside that comes up under the lip of the vinyl siding but does not touch the sill plate. Below are some things to note about crawl space foundations:
- Price – crawl space foundations fall into the middle price range compared to other systems
- Installation time – this system falls in the middle range for installation time, but is typically completed by the time the home arrives to the site
- Wind resistance – not ideal for hurricane prone areas but still effective in areas with higher winds
- Stability - seismic resistance
- Flood resistance - not intended for flood prone areas
- Frost – can be used in almost any climate