Slab is partly on disturbed soil

Exterior · Garages and Carports · printed page 335 (PDF page 336)

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Book index entries

Disturbed Soil under Garage Slab Settling in Garages Garage – on Disturbed Soil Garage – Settling

Text in the illustration

garage
wall framing
floor slab settles at edges where backfill is thickest and settles the most
crack
gravel
backfill settlement
foundation
backfill
solution: during construction, excavate central mound of soil to at least 3 feet below slab
undisturbed soil
section of garage viewed from front

Generated explanation

A front-view section of a garage shows a concrete floor slab on gravel between foundation walls and footings supporting wall framing. Beneath the slab, a central mound of undisturbed soil is flanked by thicker backfill near the foundations. Downward arrows indicate backfill settlement, and cracks mark where the slab's outer portions settle relative to its center. A dashed excavation profile illustrates the annotated construction solution: excavate the central mound to at least 3 feet below the slab.