Wedi is a 100% waterproof, mould proof system for use in internal wet areas. The Wedi system offers endless design opportunities allowing you to create your own unique space, whilst maintaining structural integrity and providing a revolutionary saving on time. The system allows you to go from framework to tile in just a few hours, the fastest installation process on the market.

The building panels themselves are lightweight, easy to cut, clean and install, are internally waterproof, compatible with any substructure and boast enough strength to hold all types of tiles.

Each panel is made from waterproof extruded polystyrene foam, which is reinforced with fibreglass mesh on both sides and coated with synthetic polymer resin mortar. This process produces the panel’s robustness and its ability to develop the highest adhesion strength to any type of Thinbed Mortar. Also eliminating the risk of delamination.

Wedi products are supported with a comprehensive 10 year full replacement warranty.

Key Features

Ideal Applications

Technical Specifications

Technical Data of Building Board

Waterproofness of Assembled System Australia CodeMark CM20134
Waterproofness of Assembled System New Zealand CodeMark CM20221
Tensile Strenght (Thinset Mortar to wedi Coating to Foam (ASTM C297) 0.45 N/mm2
Shear Strenght (ANSI A118.10-1999)
  • 28 day Shear Stregnth: 0.65 N/mm2
  • 84 day Shear Strenght: 0.68 N/mm2
  • 100 day Shear Strength: 0.67 N/mm2
Capillarity 0
Flexural Strength (ASTM C947) 4.32 N/mm2
Robinson Floor Tester (ASTM C627) Heavy duty commercial use, passed*
Temperature Limits -50 C to + 80 C
Long-term compressive strength (50 years) ≤ 2% compression EN 1606 0.08 N/mm2
Compressive resistance or compressive strength at 10% compression EN 826 0.25 N/mm2
Dynamic Impact Test (10 mm board attached to 450 mm timber studs NCC 1 Spec C1.8) Passes
Max. hanging load when wedi is used on the ceiling 88kg/m2 *
Max. hanging load when wedi is used on Timber Wall Studs 113kg/m2 *
Fungus & Bacteria Resistance (ASTM G21) No Growth, Passes
Drain Assembly Kit, WaterMark Passes
Weight for Building Board (2500 × 1200 × 10 mm) 10.1 kg

* Consult with wedi on proper substrate preparation, tile and setting material choice to design for performance

** When fastened with wedi hardware/washers in accordance with wedi guidelines

Thermal insulation values of the Building Board

Nominal Thickness R-Value U-Value W/m2 x K
4 0.68 1.47
6 1.03 0.97
10 1.72 0.58
20 3.44 0.29
50 8.6 0.12

1) When determining the U-value, only wedi building board and heat transmission resistance 1/ai and 1/aa for external walls are taken into account. In specific applications, the existing masonry and other layers must also be included.


Request a Quote Today