Installing ceiling insulation

Use a trained professional to install or upgrade your insulation, as even small installation faults can affect its performance or create safety hazards.

Using a qualified professional

Professional installers buy insulation in bulk so they may be able to supply and install your insulation for about the same as it would cost you to buy it in a hardware store. We recommend you get more than one quote so you can compare prices.

We recommend using a trained professional installer who: 

  • works to the New Zealand insulation installation Standard NZS 4246:2016;
  • has completed the insulation installer training of the Insulation Association of New Zealand (IAONZ).

 New Zealand Standard for installing insulation

 Enter your region in the search box below to find a list of insulation installers on yellow.co.nz:

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DIY checklist

If you’re going to install ceiling insulation yourself then there are some things you should think about.

  • New Zealand Standard NZS 4246:2016 contains everything you need to know about installing insulation. It's easy to follow with lots of colour pictures, and it's free to download (see link below).
  • Safety - as with all DIY projects, there are safety considerations. Make sure you read and follow the Health and Safety advice in Appendix B of New Zealand Standard NZS 4246:2016. If you're not sure, get a professional to install the insulation for you.
  • Ceiling space - does your house have a ceiling space? If not, it could be tricky to install, but it may still be possible to put insulation in your skillion roof or cathedral ceiling (see link below).
  • Existing insulation - a quick look in your roof space will tell you if you have any insulation already. If there is, you'll still want to check what state it's in (see link below).
  • Leaks and electrical issues - check your roof and any plumbing in the roof space for leaks. Check that your electrical wiring and installations are in safe condition. You should fix any issues before insulating.
  • Insulating around heat sources - having the right gaps between ceiling insulation and heat sources like recessed downlights, chimneys, flues or extractor fans is important for fire safety. Refer to New Zealand Standard NZS 4246:2016 for detailed requirements.
  • Multi-storey homes - only the upper ceiling between your home and the outside needs to be insulated. You don't need to insulate the ceiling between floors except above or below unheated rooms like laundries, workshops or garages.

 New Zealand Standard for installing insulation

 Checking existing ceiling insulation

 Insulating skillion or flat roofs