GreenTech Homes Perth

Therma Bead Insulation


Cavity Wall Insulation is one of the most effective, energy efficiency measures available and Therma bead is currently the first of its kind in Australia. Insulating your wall cavities will pay immediate dividends in reduction of your heating and cooling costs and will greatly assist in achieving higher star energy ratings for your property.

Household energy use contributes 40% of the overall energy consumption in the world. If all houses in Australia were insulated to a high standard, there would be a significant reduction of approximately 50-60% of domestic energy usage which would reduce the load on the service providers and greatly reduce the Australian carbon footprint. The range in temperatures within Australia is very large ranging from as low as -7*C in Southern regions to about 50*C in places to the North. Within Perth there can be prolonged periods of temperatures in excess of 37*C. During these times the heat built up in the internal fabric of the building, otherwise known as thermal mass, mean that there is constant need for air conditioning to maintain temperature.


Why should we insulate your property?

GreenTech Homes are committed to providing our clients with the ability to achieve the National Construction code requirements for thermal performance in dwellings, our unique insulation product has been manufactured in accordance with AS 1366.3 under AS/NZS 4859.1:2002.

We can offer advice on all the energy consumables within the property to allow you get the best result for both you and the environment. 

The four main areas of a building that if insulated would make a significant difference to the thermal performance

  • Floors
  • Walls
  • Windows
  • Roof

Benefits of insulating your home with Therma bead

Creating an insulated building fabric is the best way to reduce the heat transfer and reduce the running costs of a house.


  • Raise thermal performance to the current NCC/BCA requirements
  • Your cooling & heating bill will be reduced by approximately 40%
  • Can be used on old or new buildings
  • You will be doing your bit to help the environment by reducing CO2 levels
  • Improve the energy efficiency & rating of your property
  • By insulating the wall cavity, you will have a warmer house in the winter and a cooler house in the summer
  • Condensation is eliminated
  • Draughts are reduced as the insulation seals gaps around badly fitted window and door frames
  • A constant temperature is maintained throughout the house
  • Insulation is one of the most cost effective measures you can make on your property
  • Therma Bead is 100% recyclable
  • its non invasive, has now fumes and it works instantly
  • It allows moisture to drain down in the cavity without transmission to the inner cavity leaf


Therma Bead


Cavity Wall Insulation

Cavity wall insulation is one of the two most effective energy efficiency measures available. Insulating walls pays immediate dividends in the reduction of heating and cooling costs. Thermal bridging is eliminated.

Up to thirty-five per cent of heat loss or gain is through walls that have not been insulated.  Cavity walls are filled with an insulating material, polystyrene beads or foam. Insulating cavity walls will help trap heat and prevent warmth from transferring through the wall. Unlike polyurethane foam, the Polybead do not put any undue pressure on the structure and possibly cause structural damage to the walls.

The polystyrene do not form a complete vapour barrier and therefore do not create a condensation problem with sweating within the cavity structure.

An experienced installer will be able to check your property’s suitability for cavity wall insulation and recommend the best type. Your property must have a cavity which is 50mm wide. Should you property have a solid wall construction then another form of either external or internal insulation is recommended. The insulation is blown into the wall cavity from the outside of your property through drilled holes. The holes are then filled in with materials that match your brickwork.

Cavity wall insulation is normally completed in a day, but this depends on the size of the house and other factors, such as ease of access.

How is cavity wall insulation installed?

Modern blow-in methods ensure complete insulation coverage with no voids, so savings are immediate. Small, easily mended, holes are drilled from the outside wall, into the interior of wall cavities. This allows the nozzles to penetrate and the insulation to reach every nook and cranny. With today’s non-intrusive techniques, there is only a minimum amount of disruption.

Is my house suitable?

This method of cavity wall insulation can be used with both existing retrofit properties with a cavity and new build. With a new build, the cavity is left with no insulation installed by the bricklayer, reducing the timescale for the construction program. The Polybead is injected into the cavity at a convenient time which does not affect the ongoing construction time frame.

For existing retrofit properties, the cavity wall installations require a survey prior to the installation and the walls must have a cavity, which has not been filled. Amongst other things, the surveyor will measure the area to be insulated, check that there are no obvious signs of damp present, there is adequate ventilation, and the type and condition of the structure is sound.

There must be a cavity present to allow the Therma Bead enter and fill to create the insulating medium. The graphic opposite shows the difference between cavity walls and solid walls. The pattern of the bricks can often be an indication of the type of wall you might have. The surveyor’s report will determine the suitability of the property.