Below-Ground Waterproofing Under NCC 2025
NCC 2025 changes the way below-ground waterproofing needs to be considered on Class 2-9 projects.
The key shift sits inside F1P1 and the new defined term “water”. That definition now captures sub-surface water, surface water seepage and rising damp, which means below-ground waterproofing is no longer a grey-area construction detail. It is part of the compliance conversation.
For builders, designers and certifiers, the practical issue is simple: there is no generic Deemed-to-Satisfy pathway for new-build below-ground waterproofing. The solution needs to be justified.
This article summarises the key changes and links to the full white paper prepared by David Previte, Sam Parker and Stan Giaouris.
Read the White Paper
Understand the new compliance requirements for below-ground structures and the practical implications for certifiers, designers, builders, and material suppliers.
What You’ll Gain
CPD Certificate
Whether attending online or in-person, you’ll gain a CPD certificate for 1.5 hours (1 CPD point).
Flowchart
A clear system selection decision flowchart.
Support
Direct access to the Waterproofing Integrity technical team.
