Technical Info

Home Insulation | Roof Insulation | Ceiling Insulation | Insulation Materials

Home Insulation Technical Chart


What is the “R-Value”?

When talking about the SANS 10400-XA home insulation requirements we often refer to an insulation materials R –value. The R-value is a measure of thermal resistance. It is expressed as the thickness of the roof insulation material divided by the thermal conductivity. In layman’s terms, R-value measures how effectively a roof insulation material slows the flow of heat from a warmer to a colder area. Hence, the higher the R-value of the roof insulation material, the better it insulates. The R-value increases in direct proportion to the increase in material thickness for thicknesses less than 1m. As a result, if the thickness is doubled the R-value is also doubled.

All ceiling insulation products must state the R-value of the product on the packaging and ethical home insulation manufacturers have this certified by the SABS. Some roof insulation materials may be much thicker than others yethave the same or lower R-value. The combination of Thermguard home insulation’s high intrinsic R-Value and 100% coverage makes it exceptionally effective. Always compare R-values of home insulation materials to ensure you get the best “bang for your buck”. Ironically, some more expensive and thicker materials have poor performance figures.

What is “Embodied Energy”?

The energy which was consumed during manufacture is often referred to as the embodied energy of a ceiling insulation material.

Thermguard home insulation has a very low embodied energy as the major raw material, waste paper, has an effective value of zero. It merely has to be transported to the factory rather than to landfill sites. The milling of the product is a relatively low energy process. By contrast, processing of raw materials for glass fibre manufacture requires extraction and crushing of finite mineral resources by energy-intensive methods.

Thermguard home insulation uses significantly less energy to manufacture than typical home insulations. It uses 12 times less energy than polystyrene, 15 times less than glass-fibre and 33 times less than polyurethane. Given South Africa’s energy crisis as well as the “Green- Building” requirements, the construction of buildings with a low embodied energy is an important objective for Architects


  • Thermguard home insulation has both ISO 9001:2000 Certification and the S.A.B.S. Mark
  • Thermguard is a member of T.I.A.S.A. the Thermal Insulation Association of South Africa
  • Thermguard roof insulation is fire tested to SANS 10177 Part 5 and 10 test protocols. It does not support flame spread. It is classified B/B1/2

Architectural Specification

“Thermguard Cellulose Fibre Home Insulation evenly blown to a depth as stipulated by SANS 10400-XA: Energy Usage in Buildings. Downlighters and recessed light fittings to be isolated as per manufacturer’s instructions”

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