New Zealand Drainage Standards 3500 Part 2.2 Clause 3.8.2b states - Drains laid through footings shall be installed with an annular space of not less than 25mm filled with a liner of flexible material.
STYRO40: Styrolag 40mm X 600mmSTYRO50: Styrolag 50mm X 600mmSTYRO65: Styrolag 65mm X 600mmSTYRO100: Styrolag 100mm X 600mmSTYRO150: Styrolag 150mm X 600mm
Allproof E-Flex Solar
Allproof ISO Pipe SSR
Pipe Sleeve
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