- Product description
- Product details
Underfloor insulation = toasty toes
More than 10% of the heat from your home can be lost through the floor. It's so important that all rental properties must have underfloor insulation and EECA has subsidies to encourage homeowners to insulate their subfloors too.
Underfloor insulation can reduce draughts as well as dampness as it can limit moisture from rising into the house from a wet or damp crawl space below. Limiting rising damp will create a warmer, drier room, and that's where a ground moisture barrier can also help. If you already have foil insulation, we can also help if it is torn or damaged.
80-100% underfloor insulation Subsidies.
Homeowners may be eligible* for underfloor insulation subsidies - find out if you're eligible by see if you're eligible today. If not, we have other finance and payment options available. Get a quote today and we can let you know what you're entitled to.
The best underfloor insulation.
Some forms of insulation don't cope well with the damp conditions under your home and can sag after a period of time becoming less effective.
We have a range of high quality underfloor insulation options and are experts at crawling around under floors installing insulation quickly and safely to make your home warmer without fuss.
We can also let you know whether your home also needs a moisture barrier underfloor to avoid excess damp and where necessary can safely remove foil insulation that has lost it's effectiveness by being torn, tarnished, corroded or dusty before installing your insulation underfloor.
Our underfloor insulation products.
- Mammoth polyester R1.5 staple-in underfloor blanket
- Mammoth polyester R1.8 staple-in underfloor blanket
- Mammoth polyester R1.9 self-supporting underfloor sections
- Moisture barrier polythene sheet .25mm
- Underfloor foil-removal service
For more information on Mammoth underfloor insulation click here.
Finance & Funding
Save while you pay for underfloor insulation. Insulation is recognised as an important component of a healthy home and it lowers your heating costs. We have a range of financial options to make retrofitting underfloor insulation affordable now.
- One Smart Energy 24 month instalment plan
- EECA Homeowner Insulation Grants
- Council Rates Programmes for Insulation & more
- ANZ up to 4 years interest-free
- Westpac Warm Up Loans
- Mortgage Top-Ups for energy efficiency products
- Q Card Finance
- Squirrel Money
6 questions & answers about this product
What types of underfloor insulation are there?
Types of Underfloor Insulation
There is a range of underfloor insulation materials available each with their pros and cons.
- Polyester underfloor insulation sections: higher density sections that are easily squeezed in between joists and are self-supporting without staples or straps. Polyester insulation is moisture resistant.
- Polyester insulation blanket: can be stapled snugly into position by professional installers. Stapling underfloor where there are live wires can be dangerous for DIY installers.
- Fibreglass underfloor insulation: this material is low density and is used extensively in ceilings and floors but underfloor can be affected by the damp conditions.
- Foil underfloor insulation: was used extensively years ago for reducing radiant heat loss. It's effectiveness is lost when it is tarnished or corroded, collects dust or condensation, gets ripped or damaged. Due to risk of electrocution in working with a conductive material around electrical wiring - extreme care must be taken with installation. Installing foil insulation is not an accepted underfloor insulation option under the Residential Tenancies Act.
- Polystyrene underfloor sheets: these are rigid sections that have been used extensively in the past. The polystyrene must be isolated from TPS wiring for safety as it can be affected by the polystyrene material. Some forms claim to be self supporting but require tacks or fittings to hold them in place.
What height is needed underfloor to add insulation?
Typically our dedicated installation team need at least 40cm height between the ground and the bearer to safely install your insulation. The access point from outside must similarly have at least 40cm height clearance. Areas with less clearance or badly littered with broken glass or debris may not be able to be insulated.
What R-Value of underfloor insulation do I need?
The thermal resistance value or R-Value required for underfloor insulation to meet the New Zealand Building Code is R-Value 1.3. This standard is the same for all geographic regions.
Remember this is the minimum level - we recommend installing insulation at R1.5 to R1.9
What underfloor insulation do rentals need?
If underfloor insulation needs to be fitted in your rental property then it must be bulk insulation that meets an R-value of 1.3.
It is not permitted to insulate with foil insulation any more and existing foil insulation only meets the standard if it is not dusty, ripped, torn or tarnished.
For more information about underfloor insulation you can read Tenancy Services guidelines to Healthy Homes Insulation Standards.
Should ground moisture barrier be installed with Underfloor Insulation?
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 cost-effectively installed at the same time as your underfloor insulation. If your property is eligible for an EECA subsidy - it will cover this cost as well.
Is underfloor foil insulation any good?
Foil Insulation not accepted
Foil insulation was commonly used underfloor in the past and it does provide insulation from radiant heat loss but does not have an R-Value like bulk insulation. Existing foil insulation is only effective for radiant heat loss if it is intact (not ripped) and is neither dusty or tarnished.
If you do not already have underfloor insulation installed, foil insulation is not accepted as a solution under the Residential Tenancies Act or Healthy Homes Standards.
Ask a question about Underfloor Insulation
3 customer reviews
Salesman very informative, great price. Best part - already had it in the ceiling so got the underfloor done as well. All good, notice the difference and I have recommended you to friends.Heather, Hawke's Bay
The three guys who installed the insulation were very efficient and also happy in their work. The underfloor installation would not have been very pleasant as there is not a lot of room under the house but the work was carried out cheerfully and efficiently. They installed polythene sheeting over the ground right through the length of the house and as the ground slopes up, leaving very little height space at one end, it could not have been a very pleasant job. Also attaching the underfloor blanket would not have been easy. I was very pleasantly surprised they were able to complete the whole area. I also love the quality of the insulation, both underfloor and in the ceiling, and am looking forward to a much warmer and drier house next winter.Sylvia, Auckland
The installation team went the extra yard to completely insulate the under floor area.Thomas, Otago
Fast and efficient service from the quote to the installation.Michelle, Whakatane
I'm really pleased with the work that was done and the house is much warmer and drier now. Thanks very much to all the team for a very good job. It was such a pleasure to have your guys here and hardly be aware that they were at work, they were polite, tidy and just quietly got on with it.Alison, Northland
The sales person knew the information but there was no pressure. The installer was excellent and did a careful and tidy job and was very helpful with explaining the operation.David, Tauranga
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