Ground Moisture Barriers (GMB)

Ground moisture barriers aren’t just a box-tick for Healthy Homes compliance, they’re one of the most cost-effective ways to create a drier, healthier home. A GMB stops moisture from rising through the soil and creeping into your subfloor and living spaces. Even “dry” soil constantly releases moisture vapour, which can build up under your house and lead to dampness, mould, and heat loss. We’ve installed close to 1,000 GMBs in the past two years alone, so you’re in good hands. Our installs are clean, compliant, and built to last - all sharply priced.

FAQ's

- Does my underfloor cavity require a GMB for HH compliance?

A GMB is required if the subfloor space is enclosed, i.e. airflow is obstructed along 50% or more of the perimeter of the space. Many properties have subfloor perimeter cladding like baseboards. Should the gap between baseboards be greater than 20mm, the cavity is considered sufficiently ventilated and won’t require a ground moisture barrier.

What materials and method do you use?

We install ground moisture barriers to NZS4246:2016 standards, and use high quality 250um polythene rolls, galvanised ground staples and PVC tape.

I’ve got rubbish and belongings under the house?

Ideally belongings and rubbish to be removed before install. That said, our unit rate includes a complimentary provision to shift & repile belongings, rubbish & debris. Anything signficant may incur a (reasonable) labour surcharge.

My underfloor cavity slopes and/or has large mounds, depressions, etc

No problem for us, we’ve seen it all. We always ensure 100% functionality but please note difficult terrain will affect asethetics.

How much does it cost to get a Ground Moisture Barrier installed?

We install ground moisture barriers for $7.50 - $10/m2 (including material cost, install cost and GST)

Calculate the cost →

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We're proud of our verified 100% customer satisfaction rate, as seen on Google and Builderscrack.

Kaiser Insulation has been amazing to deal with. Alex is a absolutely champion, really friendly and easy to deal with and did a amazing job at insulating both our ceiling and external and internal walls. Competitive pricing and great result so would highly recommend! Thanks again!
Alex is super friendly and gets the job done. The communication was easy and the installation was smooth. They tidied up when they finished the job and even wiped the door frame and wall with wet tissues just in case there were dust escaped from their protective wear. Highly recommended!

Kera Wang

Excellent service! Great communication and a friendly, hard working team doing all the right things. This was a painless and easy process for us, retrofitting our ceiling insulation. Alex was kind enough to give us two quotes, one more reasonmable than the other and explained the difference between the two. We chose the thicker option. And we are stoked with the results! Thanks so much guys and keep up the great work.

Becks R

So happy with my insulation job completed by Alex and his team of professionals. Alex responded to my enquiry promptly and quickly responded to my job requirements with a some different options whicih gave me choice and all at very good pricing . His team were punctual, incredibly polite and friendly and extremely efficient. They over delivered and left the property in a very tidy and clean condition, taking all their rubbish away with them. I would recommend Kaiser Insulation to absolutely anyone for price, efficiency and service with a smile. The PS3 and Branz information were provided promptly at the end of the job in time for the inspector. Well done guys! and Thank You So Much Alex. You are running a great business!

Areas We Service

We provide ground moisture barrier installation across the entire Auckland region and beyond, including but not limited to:

  • Central Auckland (Mt Eden, Epsom, Ponsonby, Grey Lynn)
  • North Shore (Albany, Takapuna, Birkenhead, Glenfield)
  • South Auckland (Papakura, Manurewa, Pukekohe)
  • West Auckland (Henderson, Massey, Kumeū)
  • East Auckland (Howick, Pakuranga, Botany Downs)
  • Waiheke Island

No matter where your new build or renovation is, we can help.

Calculate your ground moisture barrier cost

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