The 145mm isotherm insulation is the recommended thickness for Johannesburg, Pretoria and Western Cape. We currently have a very reasonable 145mm isotherm price. It is also compliant with the sans 10400-xa building laws.
There are many insulation products on the market. Not many of them have the same advantages of isotherm. It is a recycled green polyester insulation. Made from PET bottles in South Africa. Its dust and allergy free.
145mm isotherm price per m2
The 145mm isotherm price per m2 may vary from home to home. This is because we have to consider the difficulty of the installation. You will get a higher price if it is not an easy roof to work in. For example, if there was no place to stand in the roof. We might have to take off roof tiles and do the installation for the outside. This is very time consuming. So we will have to compensate for that.
Another installation type that will increase the price is a suspended ceiling. While not a hard installation. Its time consuming. We have to work from underneath. Tile by tile until we have finished. We could generally insulate 3 homes in the time it takes to finish a suspended ceiling installation.
R-value of the 145mm
- 145mm – R-value 3.37 (product r-value only)
- 145mm – R-value 3.7 (including roofing materials)
The r-value of any insulation product is important. You must check if the r-value you are being offered is Sans Compliant for your climatic region. You can ask your local isotherm installer. It also has an 11.5kg density. This helps for thermal and acoustic properties.
When you drop down to a thinner thickness. The density of the product will drop as well. For example, the 100mm isotherm has a 10kg density. There is a massive difference in thermal insulation between densities.