Footings must be designed with adequate size to distribute the load to the soil. Similarly, grade beams at the edge of the foundation support the superstructure above. Concrete spread footings must provide support beneath foundation walls and columns. Foundation walls must be designed to resist vertical loads from the structure above and transfer these loads to the footing. The proper use of welded wire fabric and concrete with a low water/cement ratio can reduce shrinkage cracking, which is an important concern for appearance and can also aid radon infiltration control strategies.įoundation walls are typically constructed of cast-in-place concrete or concrete masonry units. Concrete slab-on-grade floors are generally designed to have sufficient strength to support floor loads without reinforcing when poured on undisturbed or compacted soil. In some cases additional footings (often a thickened slab) are necessary under bearing walls or columns in the center of the slab. The major structural components of a slab-on-grade foundation are the floor slab itself and either grade beams or foundation walls with footings at the perimeter of the slab (see Figures 4-2 and 4-3). Slab-on-Grade Foundation with Exterior Insulation 4.1 Recommended Design and Construction Details Grade beam with brick veneer/ exterior and under slab insulationįigure 4-1.Concrete wall with brick veneer/ under slab insulation.
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