How often should roof insulation be replaced?

Buy Roof Insulation at Pricewise Insulation

Many customers come to us asking how long their insulation should last. If you haven’t built your new home but moved into an existing home (this is the majority of us), then here are a few tips on checking your insulation’s performance. Firstly, check whether your home already has insulation in the walls, ceiling and/or underfloor area. If any of these areas are lacking insulation, consider retrofitting your insulation. In this blog, we will be focusing on roof insulation batts, as up to 35% of summer heat gains and winter heat losses can occur through an uninsulated roof.

How long should roof insulation actually last?

As a rule of thumb, we recommend checking your roof insulation every 15 years as standard insulation may start to degrade after this time. If your insulation is old, then there’s a chance gaps may be present and air drafts as a result. You may notice a deterioration in stable indoor temperatures and an increase in temperature bills and this can be a sign that its time to check your insulation.

Although we suggest checking your insulation every 15 years, today’s insulation is manufactured and designed to last for the lifetime of your home. Knauf Earthwool products come with a 50 year warranty on their products, whilst Bradford insulation has a 70 year product performance warranty.  

What factors affect the lifespan of roof insulation products?

  • Insulation moving – If insulation isn’t fastened or installed properly it may move from its place, exposing that area causing air draughts.
  • Moisture damage and mould growth – Water leaks and condensation can compromise the performance of insulation and may lead to mould growth. If your insulation is affected by water damage, we recommend removing it, finding the source of water or condensation and fixing it before you install new insulation material.
  • Dirt and Dust – If roof insulation batts become dusty or dirty this may reduce the effectiveness of the insulation material.
  • Physical damage – tears in the insulation can leave gaps in the insulation which reduces its performance.

Should I replace my roof insulation or top it up?

Roof Insulation

If you notice fluctuating temperatures within your home and air drafts, you may want to check your roof insulation batts. If your roof insulation shows signs of mould, is wet, or extremely degraded, we recommend removing the insulation, inspecting the area, repairing leaks and air gaps were possible before installing the new roof insulation batts.

On the other hand, we recommend topping up your insulation once you have inspected the area and no damage to the insulation is seen. If your home has quality insulation but you require a higher R-value for greater thermal performance, we recommend topping up!

Cheap Roof Insulation for topping up?

At Pricewise Insulation, we offer a range of roof insulation batts in a variety of R-values to top up your roof area. These include; Knauf Earthwool ceiling insulation batts, Greenstuf polyester ceiling insulation and Bradford hi-performance gold ceiling batts. In most Australian climates, we recommend installing a minimum R-value of R4.0 in your roof area. 

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