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Ground Vapour Barrier insulation Sustainability Trust

Ground Vapour Barrier

This is only available for installation by our team of experts.

Our in-house home energy assessors, insulation and electrical installers are trained, accredited and experienced professionals.

Note: All home energy product supply and installs must start with a home assessment.

Contact us for your home heating solutions and energy efficiency advice: Call 0508 78 78 24, option 1 or click below to arrange an assessment.

Book an assessment


A ground vapour barrier protects against rising damp and mould, making homes drier, warmer and easier to heat.

This ground vapour barrier is 250 micron thick polythene for long-lasting, maximum protection from cold and damp.

Up to 35 litres of water a day can be released into a home from exposed soil under the house. This 'rising damp' moisture raises the inside relative humidity which can cause mould to grow and moisture problems such as condensation on walls and windows. A house with a high moisture content is often colder and more expensive to heat. Ground vapour barriers provide protection from the cold and damp ground, preventing moisture rising.

Sustainability Trust services include insulation assessment, fix-up, top-up and full install of energy-efficient insulation from leading brands such as GreenStuf and Pink Batts. Insulation installations come with a three-year workmanship guarantee to NZS:4246 (2016) standards.