PlumbingResidential
Below-Ground Drainage Inspection & Test Plan
ITP for below-ground sanitary and stormwater drainage including bedding preparation, pipe laying, jointing, grade verification and mandrel testing prior to backfill per AS/NZS 3500.2.
13 checklist items
2 hold points
1 witness points
Checklist Preview
Trench & Bedding
Requires sign-offP/F
Trench width and depth per specificationP/F
Bedding material type and compaction#
Bedding thickness (mm)P/F
Subgrade free of rock and debrisPipe Installation
Requires sign-offP/F
Pipe grade verified with laser/level Hold Witness
P/F
Joint assembly per manufacturer instructionsP/F
Junctions and bends at correct locationsP/F
Inspection openings per AS/NZS 3500Testing & Backfill
Requires sign-offP/F
Mandrel test passed (95% nominal ID) Hold
P/F
Water tightness test satisfactoryP/F
CCTV inspection completed (if specified)P/F
Backfill material and compaction compliant✓
Underground marker tape installedPrefer AI?
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