How insulation works – and how to tell if it will do the job
There are three factors that determine whether insulation delivers the goal of a warm, dry house. These are:
- The thermal resistance (R-value)
- The quality of the product used
- How well it is installed
Thermal resistance (R-value)
Insulation performance is measured by its thermal resistance (R-value). The higher the R-value on an insulation product, the more it slows down heat loss.
For a fixed insulation density, the R-value of insulation gets higher as the product gets thicker. For example an R3.0 product has greater thickness than a R1.0 product of the same type.
Don’t make the mistake of judging different types products by comparing their thickness – always use the R-values. That way, you’ll be comparing like for like but this generaly only applies to ceiling insulation.
For your underfloor insulation always try to use a high density product as R-value is not of much benefit in underfloor insulation as you need density to restict the cold air being sucked through. A lot of the products on the market being sold for underfloor insulation show they have a specific R-value at 15deg C so when the temp drops the R-value reduces rapidly with it, end result low performance!!! Call us to discuss on 03 4773590
Good quality insulation is more likely to do its job and remain effective for years to come. Here’s what to look for:
- Performance guarantees. Don’t accept anything under 20 years – some products come with 50-year performance guarantees.
- Product testing. We recommend products tested to the AS/NZS 4859.1 Standard, ‘Materials for the thermal insulation of buildings. Part 1: General criteria and technical provisions’.
Compliance with this standard is now required by law for all insulation products used in new houses.
Professional installation is best
Our installation team is trained to select the most appropriate products for your home, and install them to the highest standards.