We sell and install New Zealand wide

DIY Home Insulation Installation

Mammoth™ is easy and safe to install yourself.

Mammoth polyester insulation is a great option for DIY insulation installers since the product is non-toxic and non-irritant.  Unlike traditional insulation, you do not need  protective clothing, gloves and face masks to handle Mammoth insulation.

We recommend you watch this short installation video to gain an overview of how to install Mammoth polyester insulation.


1. Choose the right product type for the area you want to insulate.  View our Product Range for the ceiling, wall and underfloor options.  If you need further technical information, click here to view the Mammoth Product datasheets

2. Select the appropriate product R-value for your climate zone

3. Measure the joist widths to accurately order the correct sized wall and underfloor products.  It pays to check all joist spacings as many homes have varying joist widths.  Below is a table to help you select the correct size:

Mammoth Product compression rates












4. Calculate the number of square metres you require for each area you wish to insulate.

5. Carefully read the installation instructions.  Every product pack comes with the installation and fitting instructions.  Alternatively, you can download them using the links below.  Getting it right matters, so please ensure you carefully read the instructions as they outline all recommended tools, cutting instructions, clearances and any hazards you may come across.  

New Zealand Building Code requirements 

If you are renovating or building a new home then you need to consider the New Zealand Building Code requirements for insulation.

The Building Code in New Zealand requires that insulation meets certain criteria which cover durability, internal moisture, hazardous building materials and energy efficiency.  You need to ensure the insulation you choose meets building code requirements.

One of these Building Code requirements, energy efficiency, relates to insulation’s R-Value. The code divides the country into three zones for energy efficiency compliance and the R-value of insulation tells you how effective it is.  A higher R-value gives greater insulation effect, therefore creating a warmer home.

Minimum R-Values by New Zealand Climate Zone
Zone  Coverage Ceiling  Floor  Wall 
1 Northland, Auckland, Franklin, and the Coromandel Peninsula R2.9 R1.3 R1.9
2 Remainder of North Island except Central Plateau R2.9 R1.3 R1.9
3 North Island Central Plateau and South Island R3.3 R1.3 R2.0