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R3.5 Insulation

Insulating your roof with R3.5 insulation helps to reduce energy bills and improve comfort. Many bulk-built homes in Melbourne and Sydney have low ratings like R2.5 insulation in the ceiling. You can top this up with an additional layer of R3.5 ceiling insulation batts.

R3.5 Insulation – Brands & Warranty

Many homes have some form of insulation; however, the effectiveness of this insulation may have declined over the years because of moisture or other issues. Insulation is designed to continue to save money and provide home comfort for the life of the building. Knauf Earthwool and Autex Greenstuf offer product warranties of 50 years. Bradford Insulation offers a 70 year warranty and Fletcher Pink Batts offers a lifetime consumer warranty. R3.5 insulation is available in both glasswool and polyester materials, for example:

R3.5 Glasswool Insulation R3.5 Polyester Insulation
Fletcher Pink Batts Bradford Polymax
Knauf Earthwool Autex Greenstuf
Bradford Gold Other Generic Brands

Installing R3.5 Insulation In Tight Spaces

Where it’s obvious that it will be difficult, if not impossible, to insulate the entire ceiling area after plaster, you may need to settle for compromise. Install any ‘problem areas’ before plaster, and then load the remaining bags in the ceiling for easy access when climbing up ‘after plaster’ to finish job. Additionally, avoid any gaps in the insulation to ensure that the maximum R-value potential is being reached. Remember that although there is a squeeze to fit the insulation in tight spaces, do not compress bulk insulation as this can significantly reduce its effectiveness.

Add a Layer of R3.5 Insulation

If the insulation was installed during the Government Home Insulation Scheme, then it is worth checking if the insulation was installed correctly. Even small gaps can greatly reduce the effectiveness of the batts. Depending on the thickness of the existing insulation, you can consider adding R3.5 insulation batts.


From $ 5.83 p/m2 inc. GST
From $ 6.44 p/m2 inc. GST
$ 6.48 p/m2 inc. GST
$ 12.83 p/m2 inc. GST
From $ 11.83 p/m2 inc. GST


Roof and Ceiling R3.5 Insulation

When installing insulation in a ceiling the two most challenging areas to access will typically be the corners of the house, and any rooms that extend beyond the natural contour of the house. Installing insulation in the corners will require lots of cutting for all the intersecting joists, as there are often big support beams in the ceiling that makes access to the corners even more difficult. Installing in extended areas; If the house is a square or rectangle, all the corners will generally have the same pitch of roof. But if there are one or more rooms extending beyond the natural perimeter of the house, these extensions will often have a lower pitch, as well as requiring additional framing, making them less accessible.

Video - Brand Comparison

Buy R3.5 Ceiling Insulation Online - Pricewise Insulation
Buy Polyester Insulation Online - R3.5 Insulation
Buy R3.0 Insulation Online - Cheap R3.0 Ceiling Insulation Batts
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