GreenStuf® frequently asked questions

Can I install wall insulation in my existing home?

Wall insulation is relatively difficult to install in an existing home as the wall lining or cladding needs to be removed first. Tackle this during renovations.

How do downlights affect insulation?

There are a number of different downlights available in New Zealand. There is significant fire risk associated with downlights, so careful selection of bulbs and fixtures, as well as correct installation of the light fitting and surrounding insulation, is crucial. Only IC type downlights allow the insulation to abut and cover the luminaire. CA type downlights must not be covered by insulation. Minimum insulation clearances around un-rated downlights are required for all types of insulation, including polyester and fibreglass (glass wool), to reduce over-heating and the risk of fire. Please contact the lighting manufacturer or Autex for more information on safe clearances.

What are R-Values?

The R-Value is based on the product’s ability to reduce The R-Value of insulation is the industry standard measurement of thermal resistance. The higher the R-Value the greater the performance.

Should I double layer my ceiling insulation?

There are several different types of ceiling insulation. Segments or Pads are the conventional format for insulation products. These are installed snug between joists. Because they don’t cover the ceiling joists you lose heat through ‘thermal bridging’ due to your joists having a lower R-Value than insulation. Insulation blankets can help avoid thermal bridging as they are installed over the top of the ceiling joists providing complete coverage. Blanket insulation is supplied as rolls for easy and fast installation. The best option is a double-layer of insulation. The first layer is installed between joists and a blanket layer is installed over the top. If installed correctly, this will eliminate heat loss and ensure your home stays warm in winter and cool in summer.

Why is GreenStuf® more expensive than fibreglass?

Put simply, you get what you pay for. The raw material, chemicals, and processes used to manufacture fibreglass are reflected in the price. However, that cheaper material comes at a big cost to performance, health, and the environment. Unlike most fibreglass insulation, GreenStuf will not deteriorate, slump, or break down over time.

Are there any added chemicals used in the GreenStuf manufacturing process?

No, we use heat to bind the fibres that form the structure of GreenStuf. Some manufacturers of fibreglass insulation still use formaldehyde based binders. Formaldehyde is a known and classified human carcinogen.

What is polyester?

Polyester is a synthetic fibre made from polyethylene terephthalate (PET)—the same material used to make plastic drink bottles. GreenStuf contains a minimum of 45% recycled polyester fibre from previously used PET drink bottles, keeping them out of landfills.

Can I install insulation myself?

Yes, installing GreenStuf is easy. Installation instructions are included with all of our products. Easy to follow ceiling and underfloor installation videos are also available online.