Slab Foundations

UPDATED 11/15/2012

Slab-on-Grade Foundations Work Everywhere

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Slab Foundations, including:

  • Design and build strategies
  • Necessary codes
  • Application how-tos
  • Using materials

A slab is less expensive and quicker to install than other types of foundations

Concrete slabs are usually less expensive than full-basement foundations and crawl spaces. Slabs require less site work, can be installed in less time, and require less concrete. As long as they are detailed properly, they can be used successfully in even the coldest parts of the United States.

Slab foundations can be the finished floor
Because of the high mass of concrete, slabs can absorb and hold radiant energy in a passive solar design, and they’re ideal for radiant-floor heating systems. Concrete can be acid-etched or dyed to become ...

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Sat, 10/20/2012 - 05:49

Response to Jay Danielowski
by Martin Holladay, GBA Advisor

The vulnerability of any shallow foundation is susceptibility to frost heaving. If you are building in Hawaii, of course, you may have no frost worries.

A layer of crushed stone under a shallow slab ensures good drainage. If the material under a slab is well drained and dry, it won't be susceptible to frost heaving.

If you think that your climate and your soil conditions are such that you can omit the layer of crushed stone, you should probably talk to an engineer to confirm your hunch.

Fri, 10/19/2012 - 21:15

insulated monlithic slab
by Jay Danielowski

Why do you need crushed rock under the perimiter of the shallow footing? I am building on sandy soil

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