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Below beams

Service pipes may run under stiffening beams. When pipes are laid and beams are excavated the finished depth of all beams must be considered to ensure sufficient clearance of services pipes.

Diagram of a service pipe running 150 mm under a stiffening beam. The area between the pipe and the beam contains well compacted backfill. The void at the box out for the plumbing fixture is backfilled with concrete by the plumber.