The r-value of isotherm is different depending on what thickness you have chosen to be installed in your home or office. You should be installing a thickness that is compliant with your climatic region for best results. Check with your isotherm installer which thickness is being installed.
Johannesburg, Centurion and Pretoria need the 145mm isotherm insulation installed. The 145mm isotherm is also used in the Western Cape. The 100mm isotherm has been specified for the Durban area.
What is the R-value of isotherm
40mm = 0.82 (top up layer)
50mm = 1.02 (top up layer)
75mm = 1.53 (top up layer)
100mm = 2.33 (Required for Durban)
135mm = 3.14 (Required for Johannesburg, Pretoria, Western Cape)
145mm = 3.37 (Recommended for Johannesburg, Pretoria, Western Cape)
See the isotherm R-value graph below
Isotherm Builders Warehouse
Homeowners often get recommended the wrong thickness. You will find 50mm isotherm at builders Warehouse for a cheap price. Anyone who tells you to install 50mm of any insulation doesn’t know much about insulation. Additionally, the density drops from 11.5kg on the 145mm to 10kg on the 100mm. This has a huge impact on the insulating effect. Especially in the colder months.
Check what the r-value of isotherm is before you get it installed. You need the right thickness installed for your climatic region. Dont take a thickness that is cheap. It will end up costing more in the end to put another layer on top. Find out the cost of isotherm.
Posted in: Isotherm FAQ
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