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Under Soffit Ceilings

Where construction, design and / or cost implications prohibit the installation of an inverted roof insulation system, the requirement for insulation is met by fixing IsoBoard to the under soffit surface of the slab as a ceiling.

Isoboard Physical Properties

IsoBoard, high-density extruded polystyrene rigid thermal insulation board, having 100% closed cell structure!

Surface Bed Insulation

Loss of heat through floors on concrete surface beds is experienced as a cold underfoot condition, particularly during winter when the supporting soils cool down due to hygroscopic action of water. In order for rooms to be heated or cooled energy efficiently, the floors need to be insulated from the surrounding soil bed to prevent soilbed from being heated.

Nail Up Insulated Ceilings

Isoboard heat gain in residential homes is largely through the roof structure. Insulated ceilings retard heat flow into the living areas in summer, and contain generated heat in winter, providing a comfortable living environment.

Product Information

IsoBoard thermal insulation is a high density, extruded polystyrene rigid insulation board, having a 100% closed cell structure. IsoBoard has been tried and tested internationally since 1970, and manufactured in South Africa since 1995, using a fully automated extrusion process, in  accordance with international specifications and standards.

Agrement Certificate 2010/382

IsoBoard over rafter and truss insulation is extruded polystyrene rigid foam board that is installed between rafters or roof trusses and tile battens or sheeting purlins to form insulating ceilings.

Cavity Wall Insulation

Isoboard cavity wall insulation will prevent heat transfer and build-up to the inner leaf of sun exposed walls. Moisture within the cavity is prevented from condensing onto and penetrating through the inner leaf when IsoBoard is installed. The insulation restricts heating ingress to temperature controlled and passive cooled environments.

Inverted Roof Insulation

Isoboard – the Inverted Roof Concept, also known as protected membrane or upside down roofing, ensures insulating both the water-proofing membrane and the reinforced concrete slab from extreme thermal stress. This is achieved by placing IsoBoard extruded polystyrene insulation board above, instead of below the waterproofing membrane.


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