Plaster Finishing

Protecting the MAXRaft® Insulation

General

The MAXRaft® system exterior requires physical protection and protection from UV rays, and our perimeter footings require waterproofing also. All exterior coating products are required to meet the NZBC E2/AS1 and NZBCB2.3.1 requirements. Failure to use an appropriate product will invalidate the MAXRaft® durability clause and may result in the structural integrity of your foundation being compromised. Prior to the application of all coating systems, the MAXRaft® exterior and polythene underlayer should be clean and dry.

EPS

MAXRaft® EPS perimeter products are not waterproof, therefore they require additional water protection for the subgrade elements. The subgrade element (typically the bottom 25mm based on standard 225mm ckearance from finished floor level) should be protected through the use of a coating product with an appropriate tanking membrane that meets NZBC E2/AS1 and NZBCB2.3.1 requirements. All coating products must be applied in line with the relevant manufacturers specifications.

XPS

It must be protected from physical and UV damage through the use of an appropriate coating product that meets NZBC E2/AS1 and NZBCB2.3.1 requirements. MAXRaft® XPS perimeter products are made from closed cell polystyrene and so are waterproof and are not required to have a further waterproof coating. All coating products must be applied in line with the relevant manufacturers specifications. The coating systems mentioned above for EPS are also suitable for application to our XPS products.

Options

Current options include:

  • Beccrete fibre-reinforced & waterproof plaster coating system
  • MAXRaft® KAPO Board
  • StoMiral Plaster System
  • Specialized Plaster System
  • Dulux Acratex
  • Plaster & Flashing System

Certain types of coated plaster may be used for the subgrade elements, however you should confirm with the manufacturer that the plaster and coating meet the relevant standards above and are suitable for below ground use.

The above list is not exhaustive and other products that meet the appropriate NZBC requirements for application on to an XPS/EPS exterior may be used.