Inappropriate drainage support methods
What it looks like
Combining ground-supported and flexibly suspended sections, or using weak strapping, creates points of stress and failure if either the ground settles or the pipe is rodded.
Why it happens
Flexible, lightly galvanised strapping attached to floor beams should not be used to secure drainage that is also in contact with the ground. Such methods are inadequate as ground settlement can pull the pipe out of alignment, and they lack the rigidity to withstand forces from maintenance operations like rodding, increasing leak risk.
What it costs if it is missed
Flexible, lightly galvanised strapping attached to floor beams should not be used to secure drainage that is also in contact with the ground. Such methods are inadequate as ground settlement can pull the pipe out of alignment, and they lack the rigidity to withstand forces from maintenance operations like rodding, increasing leak risk.
How to inspect for it
Ensure drainage that is meant to be ground-supported is not inadequately restrained by flexible straps to floor structures, or that fully suspended systems use rigid, purpose-made brackets.
How to prevent it
Flexible, lightly galvanised strapping attached to floor beams should not be used to secure drainage that is also in contact with the ground. Such methods are inadequate as ground settlement can pull the pipe out of alignment, and they lack the rigidity to withstand forces from maintenance operations like rodding, increasing leak risk.
Basis in regulation
Last updated 23 August 2026. This is our editorial summary of publicly available regulation and site practice, not building control approval or a warranty determination.