R2.0 Wall Insulation


R2.0 batts for walls

R2.0 insulation is become increasingly recognised as the popular standard for wall insulation in Sydney, Melbourne and many other cities and regions across Australia. The batts should fit snugly between the joists and strapped in place if needed.


Available in 75mm or 90mm

A standard R2.0 insulation batt is typically 90mm thick. If you have narrower wall studs and still want an R2.0, then you can consider  in a hi-density variety as these are usually around 75mm thick. Hi-density batts have acoustic benefits as well.


Insulation is a cheap solution

The cost of insulating the walls and ceiling is typically less than 1% of the total construction cost. Insulation is cheaper than you think, considering that it is a once only cost that will last for the life of the building (usually 50-70 years).



R2.0 Insulation for Walls

The majority of Australian homes will have the timber frames for walls, ceilings and raised underfloors – spaced at 600mm or 450mm ‘centres’ – i.e. from the centre of the timber to the centre of the next timber. Typically this results in a gap of around 415mm or 565mm between the timbers. Insulation manufacturers have adopted the standard insulation to suit – 580mm and 430mm wide respectively, to enable a snug fit.

However not all houses are always built to this convenient standard. This usually means that more cutting may be required in order to ensure a neat finish.

Irregular and Non-Standard Stud and Joist Spacing

Below are some examples and tips for dealing with irregular or non-standard joist spacing for R2.0 wall batts.

  • Less than 400mm between timbers – use 430mm wide batt, trim away excess
  • Between 430mm and 550mm – use 580mm wide batt – trim away excess, consider using wide pieces to fill gaps
  • Move than 580mm between timbers – use 580mm and add extra strip along side, or cut the batts sideways and install as short pieces.