What is the r-value of aerolite?

The r-value of aerolite is different depending on your climatic region. You need to install the right thickness. Check with your aerolite installer which thickness is being installed. You dont want to add a top up layer later on. Get the right thickness installed the first time. Then your insulation will work effectively.

Johannesburg, Centurion and Pretoria need the 135mm aerolite insulation installed. The 135mm aerolite is also used in the Western Cape. The 100mm aerolite has been specified for the Durban area.

R-value of aerolite

  • 50mm    = 1.25 (top up layer)
  • 75mm     = 1.88 (top up layer)
  • 100mm  = 2.50 (Required for Durban)
  • 115mm   = 2.88 (Required for Johannesburg, Pretoria, Western Cape)
  • 135mm  = 3.38 (Recommended for Johannesburg, Pretoria, Western Cape) 

See the aerolite R-value graph below

r-value of aerolite insulation








Consult with an aerolite installer

Furthermore, homeowners often get the wrong aerolite r-value recommended. This results in you not being happy after installation if you only have 50mm aerolite installed. Additionally, the density of the insulation drops as you go lower in thickness. This has a huge impact on the products ability to insulate effectively.

If you are buying aerolite for a diy installation. Make 100% sure you have bought the right thickness for your climatic region. Consult with an aerolite installer before you buy the product off a shelf somewhere. Moreover, they will be able to advise you on what thickness you should be installing.


Posted in: Aerolite FAQ

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