BUILT UP INSULATION SYSTEM

Many specifiers recommend a built up insulation system for complete thermal efficiency.

The insulant such as universal wool / fibreglass is sandwiched in the cavity between the top sheet NWSSR32 and liner panel NWSSL20.

The cavity in the built up insulation system is created with either:

• The Ashgrid Safe-Loc bar system in the first diagram or
• The mini zed purlin as shown in the second diagram.

Because of increases in the insulation thickness needed to achieve the current 'U' values for buildings, the Ashgrid Safe-Loc bar system is more able to deal with the increased cavity size.

To achieve the necessary 'U' value requirements using a built up system, the insulation thickness need to be as follows:

1. Roofs 0.25 W/m2k  - 180mm
2. Walls 0.35 W/m2k  - 120mm

In cases of high humidity a vapour barrier and breather membrane may be required. These are not shown in this example to allow clarity.

For many years a shallow profile NWSSL20, in a .4 gauge has been used as the liner in the built up insulation system.

We are now able to offer a .7 gauge liner panel NWSSL32 in a deeper profile to match the same profile as the outer sheet. This has proved to be popular with experienced contractors.

The first picture below, shows a built up system using a metal liner sheet. The second picture shows a roof over system onto existing fibre cement sheets. Once again they do not show any vapour barrier or breather membrane to allow clarity.