For the insulation of partial fill cavity walls or external wall insulation as part of a cladding/render finish

Description

Polyfoam Cavityboard is a high performance, 100% ozone friendly, extruded polystyrene, rigid board insulation. It is lightweight, yet has excellent rigidity and long term effectiveness, even when exposed to moisture.

Polyfoam Cavityboard is supplied with interlocking rebated edges that help to create a complete insulated envelope with fewer gaps and also help to restrict moisture ingress across the finished construction.

Application

Polyfoam Cavityboard is used for the insulation of partial fill cavity walls or external wall insulation as part of a cladding/render finish.

Note: Our recommended solution for full fill cavity walls is Crown DriTherm Slab (datasheet Ref CD55506) or Rocksilk DriTherm Slab (datasheet Ref RD58906).

Standards

Polyfoam Cavityboard is manufactured in accordance with BSI Quality Assurance Standard BS EN ISO 9001: 2000.

Durability

The continuous service temperature limits of Polyfoam Cavityboard are -50 to +75º C.

• Excellent thermal performance

Environmental

Polyfoam Cavityboard is free from CFCs, HCFCs and any other material with ozone depletion potential in its manufacture and content and represents no known threat to the environment. Polyfoam Cavityboard is non bio-degradable.

Polyfoam Cavityboard is 100% recyclable.

Compression resistance

The rigidity of Polyfoam Cavityboard makes the board easy to handle and less prone to site damage than less robust materials.

In external render systems the rigidity of the Polyfoam board behind the lath and render will offer an excellent support to the lath and assist in the impact resistance of render system.

Moisture resistance

Polyfoam Cavityboard can be used to insulate foundation walls below dpc level. The boards are resistant to moisture absorption and can be laid in ground water or up against wet concrete with negligible impact on the performance of the product. The interlocking rebated edge sheds any water into the cavity away from the inner leaf.

Moisture absorption

Polyfoam Cavityboard has a moisture absorption of 0.3% by volume.

Vapour Resistivity

Polyfoam Cavityboard has a vapour resistivity of 350 MNs/gm.

Fire Performance

Polyfoam Cavityboard contains a flame retardant to inhibit localised ignition. The use of Polyfoam Cavityboard will not prejudice the fire resistance of the wall.

Handling and storage

The boards are easy to handle and nonirritant. No special protective clothing is required when installing them.

Polyfoam Cavityboard is supplied in polythene packs, labelled with identifying product and manufacturing data.

Ensure the boards are not stored close to open flame or other ignition source, also avoid volatile compounds and chemicals such as solvents.

Polyfoam products should not be left exposed to prolonged sunlight as this will result in surface degradation. Where outside storage for extended periods is required cover with opaque/light coloured sheeting.

Product Data