Ceiling Insulation

Our ceiling insulation range is specifically designed for skillion roof and truss roof constructions and is supplied as either segments, rolls or our proprietary double layer systems for optimal insulation performance. Custom width product can be manufactured when required to reduce waste and installation time. All of our insulation can be torn by hand across the width of the blanket.

Truss Roof Insulation // single or top-up layer
R 3.2 165 mm 32.165.435
R 3.6 180 mm 36.180.435
R 4.0 190 mm 40.190.435
R7.2 360mm 72.360.435
R8.0 380mm 80.380.435

Our truss roof insulation is supplied in a width of 870mm to fit between 900mm centre truss bottom chords. Rolls are supplied in 3.5-5.0m lengths (depending on product) to minimise joins and potential gaps.

Double Layer Truss Roof Insulation

Using our Truss Roof Blanket products, installing a double layer system is cost-effective and gives higher thermal performance than using one layer of the same thickness.

When considering our double-layer systems the truss heal height should determine the thickness of the bottom layer (allowing 25mm air gap between the top of the insulation and the roof underlay). This will give assurance of a complete thermal envelope and that the insulation completely covers the top plate. The top blanket layer is laid perpendicular to the bottom layer, reducing heat loss through potential gaps and thermal bridging through the bottom chord of the truss. This ensures higher thermal performance.

Skillion Roof Blanket Insulation
R 3.6 140 mm 36.140.560
R 5.0 190 mm 50.190.570
R 6.4 240 mm 64.240.570
R 7.2 290 mm 72.290.570

Our skillion roof blanket insulation is available in a 570mm wide fold to fit rafters at 600mm centres. Folds are supplied in 2.6m lengths and range from 3-6 folds per bale. 

Skillion ceiling cavities can have a higher risk of condensation occurring (Branz Bulletin 610). Terra Lana insulation is hygroscopic (can absorb and release moisture vapour) so can help to mitigate condensation risks.

Service Cavity Insulation

We’ve brought all the benefits of Terra Lana Wool Insulation for adding R Value in service cavity areas while greatly reducing thermal bridging in ceilings and walls.

For Skillion, Truss & Scissor Truss ceilings.

Using timber battens perpendicular to framing creates an insulated service Service Cavity for plumbing and cabling. This allows the primary insulation layer to be uncompromised, adds R Value, and greatly reduces the thermal bridging area of timbers in ceilings.

This can also reduce timber costs, where thermal standards require deeper framing. By utilising insulated service cavities, we optimise the cost of insulation and timber while meeting the higher thermal standards. It also further enhances the acoustic buffer of Terra Lana through walls and ceilings.


Thermal Bridging is where structural timber in contact with the warm and cold sides of walls or ceiling conducts heat out of the home. Cavity battens create a space and bridge over most of this conductive area, which we then fill with wool insulation.

Wrap your home in the natural warmth of Terra Lana Wool Blend Insulation

Wrap your home in the natural warmth of
Terra Lana Wool Blend Insulation

Our extensive range of wool blend insulation is perfect for any size project—whether large scale or simply improving your home.
Talk to us about the ideal solution for your project requirements.