How To Look At A House

McGarry and Madsen's home inspection blog for buyers of  

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What is a slab on grade house?

Tuesday, March 12, 2019

A slab on grade home has the foundation and floor slab poured as one piece, with the areas where the walls supporting the roof bear on the slab being thickened from 4” to 10” or 12” deep. Steel reinforcing bars are also added. The thickened areas are created by either digging deeper into the soil or adding fill to raise the area under the 4” floor slab. It’s also called a monolithic slab foundation or a thickened edge slab foundation. An example of this type of foundation is shown above and in the diagram below.    This is the most common type of house foundation in Florida and most of the warmer areas of the country. Before the innovation of a combination foundation and floor slab in the 1950s, a continuous trench was dug in the ground for a concrete footing, as shown below, with a block wall built on top of it.

    To learn more, see our blog posts What is the minimum depth below ground of the foundation of a house, for either monolithic thickened edge slab or stemwall footing? and What are the common problems of different types of house foundations?

   Visit our EXTERIOR WALLS AND STRUCTURE page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

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