Everything you need to know about Insulmax®

Stay ahead of the curve

Quick, cost effective and hassle free. The Insulmax® Existing Wall Insulation method is everything your client’s want. Choose Insulmax® to insulate existing exterior walls of homes. All without removing wall linings or claddings.

The thermal performance of Insulmax® is better than most types of conventional segment insulation and compliance with the New Zealand Building Code is demonstrated as the first  retro wall insulation method to be awarded CodeMark certification.

CodeMark certification


The position of Insulmax® as the innovative market leader in the Retrofit Wall Insulation industry was confirmed on 27th May 2016 when it became the first N.Z insulation company to be awarded CodeMark certification for its Retrofit Wall Insulation Method. The CodeMark certification includes all types of common existing buildings in New Zealand. Compliance of the system with the requirements of clauses B1, B2, F2, E2, C3, G9 and H1 of the N.Z Building Code is monitored by the CodeMark certification body Bureau Veritas.

Building consent

All forms of external wall insulation added to existing buildings require an application to your local council for a building consent or an application for an exemption, although some councils have issued a more widespread written exemption for Insulmax®.

Your local Insulmax® licensee can advise on the current situation. Whatever option you take we strongly advise that you keep a copy of the council approved application or council letter advising widespread exemption for your records. This will remove any compliance concerns when you sell your property.

After assessing the property, only a trained and licensed Insulmax® representative is able to prepare the building consent application on the owners behalf..

Scope of use

The CodeMark certificate covers the retrofitting of Insulmax® wall insulation in all existing buildings. Our product can be used in all types of exterior wall structure, with or without building paper. This includes but is not limited to: timber claddings, masonry veneer, brick veneer, solid/rendered plaster, Fibro, EIFS and double brick construction.


Installation can only be carried out by trained Insulmax® licensees using specialist installation equipment. The blown insulation is installed dry, via holes smaller than a ten cent coin, strategically placed, in the exterior or interior lining. All cavities are completely filled and confirmed by thermal high resolution imaging equipment. The installation includes reinstatement of the cladding to a durable and weather tight finish where the installation points are difficult or impossible to spot. 

What is Insulmax® insulation?

Insulmax® is a soft, white blown mineral fibre. It is a thermal and acoustic insulation made by melting and spinning inert materials, treated with inert water repellent. It is non-hygroscopic (non-wicking), will not rot, degrade or sustain vermin and will not encourage the growth of mould, bacteria or fungi.

It is manufactured in Europe, to BS EN ISO 9001 : 2012 quality standards, for the purpose of insulating walls. Insulmax® is a high performing thermal and acoustic insulation.

Thermal Resistance

At installed densities the product contributes:

  • – R2.8/100mm (typical for direct fixed cladding)
  • – R4.2/150mm (typical for masonry veneer cladding)

Tested according to EN12667:2001
Note: Total thermal resistance of the wall structure is dependent upon existing construction variables.

Negligible resistance to the movement of water vapour

Classified according to EN14064, as possessing negligible resistance to the movement of water vapour. This means the product is breathable.

Dry and safe

Installed dry with no binders, glues, formaldehyde or other additives

Water resistant

Insulmax® is treated with an inert water repellant making it non hygroscopic and has a negligible ability to absorb or wick water.

Tested according to EN 1609


Achieves the highest standard of  A1 – Non Combustible

Tested according to EN ISO 1182 & 1716

Does not settle or shrink

Settling rated according to  to EN 14064-1 :2010 as “S1”  (settling of less than 1% or too negligible to be measured) at installed densities.


Insulmax® has no detrimental effect on existing building elements and does not react with TPS wiring. Older rubber (TRS) insulated wires should be replaced before the installation of any insulation

Environmentally friendly

Insulmax®  is made from inert minerals and  is composed of 84% post-consumer waste. It is CFC and HCFC free and is classified as having zero Ozone Depletion potential and zero Global Warming potential.