Coating Options

Coating Options - Protecting the MAXSlab® System


The MAXSlab® 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 BCA requirements. Failure to use an appropriate product will invalidate the MAXSlab® durability clause and may result in the structural integrity of your foundation being compromised. Prior to the application of all coating systems, the MAXSlab® exterior and polythene underlayer should be clean and dry.


MAXSlab® 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 BCA requirements. All coating products must be applied in line with the relevant manufacturers specifications.


It must be protected from physical and UV damage through the use of an appropriate coating product that meets BCA requirements. MAXSlab® 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.


Current options include:

  • StoMiral Plaster System
  • Specialized Plaster System
  • Plaster & Flashing System

Should you wish to use plaster or aluminium above ground, a flashing tape or similar that meets the above requirements will be required to ensure waterproofing of the subgrade elements.

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 BCA requirements for application on to an XPS/EPS exterior may be used.

Contact Details and Manufacturer Specifications

Beccrete Fibre Reinforced Plaster Coating System

Contact: Bruce Cameron
Phone: 0277 112 047 or via MAXRaft directly.

Click here to view the Beccrete specification.


MAXRaft® Kapo Board

Phone: 0800 629 7238
See more:

MAXRaft® has an exclusive relationship with Envirosquare and their KAPO Board on edge insulated foundations. The KAPO Board is appraised for use as a coating option on MAXRaft® for both EPS and XPS. Please note that in some instances (such as brick veneer) the use of the KAPO Board is not a recommended coating.

Stormiral Plaster System

Specialized Tankit System

Click here to view the MAXRaft specification.