New Legislation—Insulation Compulsory in ALL New Buildings
SANS 10400–XA: ENERGY USAGE IN BUILDINGS is a new law which makes it compulsory for house insulation to be fitted to all new residential homes as of November 2011. The law is as a result of Eskom’s Demand Side Management (DSM) Plan. Eskom is desperately trying to supply enough electricity to South Africa with limited power sources. The power utility has realized that increasing the supply of electricity (building new power stations) will ultimately take years, Eskom is therefore trying to address the imbalance between supply and demand from the demand side.
An estimated 3500 MW in electricity could be saved by 2020 if thermal house insulation and high-performance window systems were introduced today into all new residential and commercial buildings. This is incidentally almost twice the electricity currently produced by our only nuclear power plant, Koeberg (1800 MW).
By fitting home insulation, South Africans can take it on themselves to help prevent the inconvenience of load-shedding. However, installing home insulation and complying with SANS 10400-XA needn’t be seen as a grudge purchase. In fact, you get long term financial savings and a comfortable living space whilst adding to the resale value of your property after the installation of house insulation.
The home insulation requirements for SANS 10400-XA are dependent on the climatic zones of South Africa. The thickness of the house insulation required is determined according to which zone your building is located in. Below is a map illustrating these different zones.
The table below shows the required R-Values for Cellulose Fibre home insulation according to climatic zone
Note: The R-Values shown above do not take into account the insulating properties of the insulation materials. Hence the actual R-Value of house insulation required will be less than that shown in the table, depending on your roof type.
Working Out your Required House Insulation Thickness:
Example for a typical building in Zone 2
Total R-Value Required in Zone 2: 3.2
The average R-Value of a normal roof structure without insulation material installed: 0.35
Therefore, the house insulation R-Value required = (3.2-0.35) 2.85
The formula to calculate the thickness of Thermguard house insulation required is:
Required R-Value x Thermal Conductivity of Thermguard (0.038)
= 2.85 x 0.038
= 108mm of Thermguard (We recommend Thermguards 115mm at R-Value 3.03 which would be more than sufficient)
Obviously roof structures differ from one another. For this reason we recommend you contact your nearest installer for expert advice on your house insulation options.
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