




On average 250ml of water evaporates from each 1m² of ground in 24 hours – that’s 60 litres a day for a 150m² house. This moisture getting into your home causes rot, mould, mildew and affecting health.
A great way to reduce moisture levels is to install a ground moisture barrier. This polythene sheeting will restrict the evaporation of moisture from the ground into the subfloor space.
Contact us today for a quote. We can also let you know what subsidies and finance options are available to pay for your other energy efficient products.
Installing a vapour barrier (thick polythene sheeting) on the ground under your house will keep the moisture in the ground and stops the air under the floor from getting damp.
Groung Moisture Barrier is polythene sheeting that is at least 0.25 mm thick and covers the ground under a house.
For the vapour barrier to be effective, quality installation is key.
• any leaks from water or waste pipes, wet areas, cladding and so on must be dealt with before the moisture barrier is laid
• check there is no surface water flowing under the building – rain should drain away from the house
• the ground under the house should be shaped so no surface water accumulates on top of the vapour barrier
• the vapour barrier should completely cover the soil & be butted up to surrounding foundation walls and piles
• the sheets should be weighted down to avoid being moved by the ventilating air movement
Contact us today for a free measure and quote, and we can install it for you as the same time as your underfloor insulation.
Onground moisture barrier is one of the best value ways to reduce moisture in your home and we have a range of finance options to make it affordable.
Ground Moisture Barrier (also know as on-ground vapour barrier) is a sheet of polythene that lays over the ground under floors to stop moisture in damp ground evaporating into the home creating damp, unhealthy conditions.
The polythene must be at least 250 microns (or have a vapour flow resistance of at least 50 MN s/g) and must be free of significant tears or holes that would allow moisture through.
If the ground underneath your home is regularly damp you should have a ground moisture barrier laid to avoid "rising damp" which can cause mould and unhealthy damp conditions in your home.
A ground moisture barrier is polythene sheeting which can be installed at the same time as your underfloor insulation.
While Ground Moisture Barrier sheets are not expensive, the key is to install it correctly or the benefits of a drier home will not be achieved. A well installed moisture barrier will:
If you're uncertain about what's involved you can read or download the standard NZS 4246:2016 here or contact us for an installation quote.
If your property is eligible for an EECA insulation subsidy - it will also cover the cost of ground vapour barrier as well.
Yes. If your rental property has a suspended floor and 50% or more of the sub-floor perimeter is obstructed then a ground moisture barrier is required.
The obstruction could be by walls, dirt, rock, adjoining buildings or any other permanent or semi-permanent structure.
We give advice and quotes on a range of products to make your house warmer, healthier and more energy efficient. Contact us and our friendly team will be in touch to discuss how we can make improving your property easy.
Hate filling in forms? Call us direct 0800 888 766
We answer 24 hours, 7 days a week so call us anytime.
We have free advice and estimates to make your home warmer, healthier and more energy efficient all year round. Call us today.
Contact or call 0800 888 766