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SANS 10400-XA Energy Efficiency in New Buildings

The energy efficiency legislation for new buildings, SANS 10400-XA, has been published by the regulator (NRCS).  All new buildings will have to comply with the performance parameters.  This means that insulation will have to be installed to achieve the stipulated R-values.

South Africa has been divided into six climatic zones according to their humidity and temperature variations:

SANS 10400-XA - Each climatic zone has different R-value requirements for certain walls and ceilings.

Climatic Zones in South Africa and the R-value Requirements – Roof Insulation and Geyser Insulation Requirements

Each climatic zone has different R-value requirements for certain walls and ceilings.  The appropriate thickness and R-value of insulation for your climatic zone, correctly installed, will protect your home against the cold, heat and save electricity providing a comfortable, healthy, safe and quiet space for you and your family.

Roof and Ceiling SANS 10400-XA

Roof and Ceiling SANS 10400-XA Requirements - Roof Insulation Requirements as per Legislation

Roof and Ceiling SANS 10400-XA Requirements – Roof Insulation Requirements as per Legislation

Building envelope requirements SANS 10400-XA “Deemed to satisfy”

  • Conceptually based on two principles:
    • Maximum energy demand per unit area(kVA/m2)
    • Maximum annual energy consumption per unit area (kWh/m2.a)
  • Dependent on building classification and climatic region
  • Design assumptions are given in SANS 10400-XA (4.3)

Maximum Energy Demand

Maximum Energy Demand for Buildings - Roof Insulation and Hot Water Insulation is Essential to Meet These Standards.

Maximum Energy Demand for Buildings – Roof Insulation and Hot Water Insulation is Essential to Meet These Standards.

The maximum demand for buildings such as Entertainment and public assembly, theatrical and indoor sport, places of instruction, worship, large shop, offices, and hotels.
The maximum demand shall be based on the sum of 12 consecutive monthly maximum demand values per area divided by 12/square meter, which refers to the nett floor area.  Roof insulation can assist in meeting these maximum energy demand requirements.

Maximum Annual Consumption

Maximum Annual Consumption of Electricity - SANS 10400 - Roof Insulation will be Required

Maximum Annual Consumption of Electricity – SANS 10400 – Roof Insulation will be Required

Note 1:  The annual consumption per square metre shall be based on the sum of the monthly consumption of 12 consecutive months.
Note 2:  Non-electrical consumption, such as fossil fuels, shall be accounted for on a non-renewable primary energy thermal equivalence basis by converting mega joules to kilowatt.

Hot water supply requirements SANS 10400-XA

Geysers-XA2

  • A minimum of 50% of the annual average heating requirement for hot water must be provided by means other than electric resistance heating (Geyser) or fossil fuels
    • See options below but not only limited to these:
      • Solar heating
      • Heat pumps
      • Geothermal heat
      • Renewable combustible fuel
      • Heat recovery from alternative systems and processes
  • The functional requirements of sub-regulation XA2 shall be satisfied when:
    • 4.1.1 The population for which such building is designed is determined in accordance with Regulation A21;
    • 4.1.2 The hot water demand is determined in accordance with table 2 and table 5 of SANS 10252-1:2004;
    • 4.1.3 The storage requirement is based on maintenance of a hot water temperature of 60 0C;
    • 4.1.4 Solar water heating systems shall comply with SANS 1307, SANS 10106 and SANS 10254 based on the thermal performance determined in accordance with the requirements of SANS 6211-1 and SANS 6211-2.
    • 4.1.5 All exposed hot water service pipes (SANS 10252-1) shall be clad with insulation with a minimum R-value in accordance with SANS 204.
    • 4.1.6 Thermal insulation, if any, shall be installed in accordance with the manufacturer’s instructions.

All exposed hot water pipes with a 80 mm diameter

  • Must be insulated with a minimum R-value of 1.00

All exposed hot water pipes with a diameter greater than 80 mm diameter

  • Must be insulated with a minimum R-value of 1.5

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