MOISTURE BARRIER

Protect Your Home From the Ground Up

A moisture barrier (also known as a ground vapour barrier or polythene ground sheet) is a simple but powerful way to protect your home from rising damp. Installed directly over the ground in your subfloor area, it helps reduce moisture, mould, and condensation—creating a drier, healthier indoor environment.

What We Use

We install heavy-duty, black polythene ground sheets that meet New Zealand Building Code requirements. The barrier is laid flat across the ground under your home, overlapping sheets and securing edges for full coverage.

Pair With Underfloor Insulation

For the best results, moisture barriers are often installed alongside underfloor insulation, creating a complete solution for warmer, drier living spaces.

Why Install a Moisture Barrier?

Moisture rising from the ground can lead to damp subfloors, mould growth, and poor indoor air quality. A moisture barrier helps:

  • Reduce mould, mildew, and musty smells

  • Lower humidity levels inside your home

  • Protect insulation from moisture damage

  • Improve overall indoor air quality

  • Meet Healthy Homes Standards for rentals

When is a Moisture Barrier Recommended?

  • If your subfloor area has exposed soil

  • If your home suffers from dampness or musty smells

  • When retrofitting or upgrading underfloor insulation

  • As part of a full insulation and ventilation solution

  • For landlords seeking Healthy Homes compliance

GET A FREE QUOTE

Looking to improve comfort from the ground up? Contact us for a free underfloor insulation assessment and quote today.