Home > Companies > Marmox (UK) Ltd > Multiboard (External)

Waterproof, thermally insulating tile backer board for external use. An internal board is available, specified separately.

Features and benefits:

  • Lightweight.
  • Dimensionally and structurally stable in all weather conditions.
  • Resistant to freeze-thaw damage.
  • Provides an effective decoupling layer between the tiled surface and the substructure.
  • The surface allows heavy weights to be safely and securely fixed to walls.
  • Impermeable to water, and acts as a moisture barrier.
  • Thermal insulation is unaffected by various temperatures.
  • The cementitious surface is resistant to heat and chemicals.
  • Can easily be cut in straight lines.
  • Provides enhanced tile adhesion.
  • Load bearing capacity exceeds 100 kg/m².
  • Boards can be aligned horizontally or vertically.
  • Does not contain any hazardous substances.
  • Manufactured in accordance with ISO 9001 Quality Management Systems and BS EN 5385-2, and CE marked to EN 13164.

Applications:

Carrier element for fixing ceramic and stone tiling and brick slips to external walls. Provides thermal insulating and waterproofing.

Boards should be stored flat. Should be covered with scrim/ reinforcing tape. For fitting instructions onto different types of substrate, consult manufacturer's literature.

Related literature

The following content references this product:

Standard product features

Material:

Extruded polystyrene (XPS), covered on both sides with fibreglass mesh, encased in a 0.75 mm layer of polymer modified concrete which permanently bonds to the mesh polystyrene.

Technical characteristics:

- Foam component:

  • Density (to DIN 53420): 36 kg/m³.
  • Thermal conductivity (K-value, to EN 13164): 0.027–0.034 W/m·K.
  • Compressive strength (10% deflection, to EN 826): 300 kN/m².
  • Water absorption (2 day immersion, to EN 12087): <1% by volume.
  • Water absorption (capillary, to DIN 53428): 0.
  • Coefficient of linear expansion (to ASTM E-831): 0.07 mm/mK.
  • Water vapour diffusion factor (to EN 12086): 110–225.
  • Fire behaviour (to EN 13501): Euroclass E.
  • Ozone depleting potential (ODP): 0.
  • Global warming potential (GWP): <0.29.

- Multiboard (generally):

  • Declared thermal conductivity after five years (to BS EN 13164): 0.036 W/m·K.
  • Compressive strength (10% compression, to EN 826): >400 kPa.
  • Maximum tile loading weight: >100 kg/m² (dependent on adhesive and wall type).
  • Flexural strength (to ASTM C203): >200 kPa.
  • Water vapour permeability (to EN 12086): 3.2 m.
  • Coefficient of linear expansion (to ASTM D-696): 30 x 10^-6 K^-1.
  • Fire propagation (to BS 476-6): 8.1, Class 0.
  • Spread of flame (to BS 476-7): 1, Class 0.
  • Impact sound reduction (to BS EN 140-8): 21 dB.
  • Working temperature range: -50°C to 75°C.

Options

Product reference:

Subsequent numbers are appropriate board thicknesses (e.g. EW1-12-60 relates to board thickness 12–60 mm). Please ensure thickness selected corresponds with product reference chosen. View manufacturer's literature for more information on specific product references.

Thickness:

Allow for dimensional tolerances of ±1 mm.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-65/410 Extruded polystyrene (XPS) board

NBS Specification

NBS Buliding logo
This product is associated with the following NBS clauses:

Product specification

An important note about specifying

Manufacturer

Name:

Marmox (UK) Ltd

Tel:

+44 (0)1634 835290

Product reference

[EW1-12-60]
-
External walls. For concrete block and brick substrates (flat). To be fixed with adhesive.
[EW2-12-60]
-
External walls. For aircrete block walls. To be fixed with adhesive or mechanically.
[EW3-12-60]
-
External walls. For rendered walls. To be fixed with adhesive or mechanically.
[EW5-12-60]
-
External walls. For intermediate plywood layers on timber/ metal frames. To be mechanically fixed.

Size (l x w)

[1250 mm (±5 mm) x 600 mm (±2 mm)]
[2500 mm (±5 mm) x 600 mm (±2 mm)]

Thickness

[12.5 mm]
-
Thermal resistance (R-Value): 0.35 m²K/W. Board weight: 2.8 kg.
[20 mm]
-
Thermal resistance (R-Value): 0.56 m²K/W. Board weight: 3.1 kg.
[30 mm]
-
Thermal resistance (R-Value): 0.83 m²K/W. Board weight: 3.4 kg.
[40 mm]
-
Thermal resistance (R-Value): 1.11 m²K/W. Board weight: 4 kg.
[50 mm]
-
Thermal resistance (R-Value): 1.39 m²K/W. Board weight: 4.2 kg.
[60 mm]
-
Thermal resistance (R-Value): 1.67 m²K/W. Board weight: 4.5 kg.

Manufacturer details

Caxton House,
101-103 Hopewell Drive,
Chatham,
Kent, ME5 7NP
Tel +44 (0)1634 835290
Fax +44 (0)1634 835299
NBS Plus
RIBA CPD