Foundation Types
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Terms
- Slab is easier and cheaper to build than a pier and beam foundation. [1]
- Grade Beam - [2]
- Grade beam is the thickened outer edge of the slab foundation. [3]
- Spread footing - 'inverted T' actually holds the pressure on the soil. Grade beam functions like a beam - spanning 2 deep piles, not relying on soil underneath for support. [4]
- Grade beams connect column foundations together - [5]
- Slab foundations are used on flat lots [6]. Supported directly be ground.
- Shallow and deep are 2 general classes. Deep ones go down to bedrock. [7]
Design
- Grade beam is min 8" wide, and depth is the length of span it supports [8]
- Compared to typical foundation, uses less concrete.