Waterproofing Compliance NZ: PS3 and E2/AS1

What architects, builders, and owners should confirm early

Agree the applicable design, membrane specification and documentation requirements early. The required evidence depends on the project and the relevant building consent authority.

What Is PS3 in Waterproofing?

PS3 is a construction producer statement confirming work has been completed in line with approved design and specifications. For waterproofing, this typically links to system instructions, installation checks, and documented scope completion.

E2/AS1 Practical Relevance

• Moisture management at external junctions and penetrations.
• Correct upstand heights and interface details.
• Fall-to-drain design and avoidance of ponding.
• System continuity across membrane transitions.

Documentation Checklist

• Approved design references and membrane specification.
• Substrate readiness records before installation.
• Photo evidence of critical details during application.
• Final scope confirmation and handover package.

Common Mistakes to Avoid

• Late design changes without updating detail sign-off.
• Mixing incompatible products in repair zones.
• Missing records for concealed stages of work.