What types of Insulation should I consider?
There are various types of insulation available, with the following being the most commonly used in residential applications:
These next-generation products are made from fibres spun from re-cycled PET (e.g. cold drink) bottles, and bonded thermally (by hot air) and woven into a flexible mat. These products are non-irritable and do not damage when wet and can be sun dried and re-installed following water damage as caused by a leaky roof or burst geyser. These materials are also used by leading mattress manufacturers (yes, you sleep on this stuff!), and are very safe indeed.
Safe and Manageable:
Our polyester blankets do not contain any fibre glass and unlike loose-fill products, are easily managed in the roof cavity.
How Much Insulation Do I Need?
The South African National Standard SANS 204 as published by the SABS provides a standard for Energy Efficiency in Buildings. Compliance to this standard can be achieved by means of a rational design by a competent person (appoint an Engineer), or by compliance to SANS 204-2 which defines an easy 'Deemed to Satisfy' (DTS) requirement based on the climatic zones of South Africa and the type of insulation material to be used.
Johannesburg is in zone 1 (Cold Interior) and Pretoria is in zone 2 (Temperate Interior).
The effectiveness of Thermal Insulation is measured in terms of thermal resistance, or R-values, essentially the resistance to heat transfer. The Thermal Resistance R-value required of added insulation is 2.30 to 3.35 for the Gauteng region in which we operate. Considering this standard and the 'deemed to satisfy' values, our own minimum recommendation is 100mm. Some customers prefer the more affordable 75mm option which leaves the customer the opportunity to add another layer at a later stage, while some customers opt for the ideal 100mm thickness. Our products are currently available in 40, 50, 75, 100, 110, 130, and 160mm options.
The Climatic Zone Map is available online from the Thermal Insulation Association of South Africa (www.tiasa.org.za) along with a wealth of information about Insulation best practices.