Advantages of Isotherm Insulation

What are some of the advantages of isotherm ceiling insulation in South Africa? Why has this product become so popular with homeowners and installers? That’s actually a very easy question to answer. It a green roof insulation product that is allergy free.

Isotherm – Green Recycled Polyester


advantages of isotherm insulationIsotherm insulation is a green recycled polyester made in South Africa by a company called Brits. They took plastic PET bottles and used them to make a green recycled polyester product. Let’s go over some of the advantages of isotherm ceiling insulation, and why so many people are hiring insulation specialists to install it nowadays.


It is a chemical free product


One of the reasons it has gained so much traction is because the product does not contain any chemicals. Cellulose fibre is a well-known product that contains chemicals. Both isotherm and cellulose fibre hold around the same R-value. So why not use the product that is chemical free?


It is a fibreglass free product


Another very popular product would be aerolite insulation. It has been around for over 75 years already. It has become a household name over the years. The only disadvantage to aerolite is that it is made of fibreglass. Being made of fibreglass does give it a higher fire rating though. Installing it will make you very itchy. Isotherm holds the same R-value as aerolite. So why not use the product that is fibreglass and allergy free?

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Isotherm thermal insulation specifications


Fire performance – Isotherm insulation complies with the SANS 10400, the application of the national building regulations in South Africa, as an insulation material.

It has been tested in accordance with the SANS 428: fire performance classification B/B 1/2.
ASTM – E 84: the spread of flame: Nil.
BS 5803 part 4: It does not smoulder.

ASTM – E84: 
spread of flame = 0
smoke index = 160
smoke toxicity = < 1 (low toxicity)
SANS 10400 – 1990 The application of the national building regulations.

Isotherm properties  It is composed of polyester. The relatively high melting point of polyester fibres gives ISOTHERM good thermal stability.

Isotherm moisture absorption – ISOTHERM does not absorb more than 2% (by mass) of moisture, which is within the limits set by the standard. Tested in accordance with SANS 1381: Part I (Materials for thermal insulation of buildings).

145mm Isotherm | 135mm Isotherm