Solution 1 - Truss Roof

To show compliance in a truss roof, ideally a heel is incorporated into the truss, allowing a double-layer to be used, with the first layer extending out to the top plate.

Using a double-layer of Mammoth’s R3.6 225mm insulation works well, exceeding the required R-value of R6.6. The second layer of blanket can start half a meter in from the top plate, or further in if need be. Other various build ups can be used, speak to your Mammoth representative for other options.

If a heel cannot be used, combining Mammoth 90mm R2.5 insulation sections with insulation in the batten space should achieve the required minimum of R3.3. This is the minimum R-value allowed under the new H1 regulations, specifically for the last 500mm of the perimeter of the ceiling insulation.

Solution 2 - Skillion Roof

With a high construction R-Value of R6.6 for rafter roofs, a double-layer of Mammoth product is required in 290mm or greater thickness rafters to achieve this.

If you are using a smaller rafter, such as a 240mm, you can use a double layer of Mammoth R2.9 115mm and look to insulate the timber ceiling battens to meet the R-value of R6.6 that is required.

Walls

Floors

Windows & Doors