Div. B › Part 4 › 4.2 › 4.2.5 — Excavations

4.2.5.8 — Backfilling

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(1) Where an excavation is backfilled, the backfill shall be placed so as to,

(a) provide lateral support to the soil adjacent to the excavation, and

(b) prevent detrimental movements.

(2) The material used as backfill or fill supporting a footing, foundation or a floor on grade shall be of a type that is not subject to detrimental volume change with changes in moisture content and temperature.

OBC Definitions

Defined terms on this page

excavation

means the space created by the removal of soil, rock or fill for the purposes of construction.

fill

means soil, rock, rubble, industrial waste such as slag, organic material or a combination of these that is transported and placed on the natural surface of a soil or rock or organic terrain; it may or may not be compacted.

foundation

means a system or arrangement of foundation units through which the loads from a building are transferred to supporting soil or rock.

grade

means the average level of proposed or finished ground adjoining a building at all exterior walls.

soil

means , except for the purposes of Part 8 of Division B, a portion of the earth’s crust that is fragmentary or such that individual particles of a dried sample may be readily separated by agitation in water, and includes boulders, cobbles, gravel, sand, silt, clay and organic matter.

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