• 12.5mm Weather Defence External Sheathing Board Square Edge 1200x2400mm
  • 12.5mm Weather Defence External Sheathing Board Square Edge 1200x2400mm

12.5mm Siniat Weather Defence 2G External Sheathing Board Square Edge 1200x2400mm

Product Code: 109116886

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Product Description

Weather Defence is a revolutionary new external sheathing board, faced with water repellent material for superior weather protection.


  • A glass fibre mat faced, gypsum based board for use externally as a sheathing board
  • Strong, highly moisture resistant, non-combustible and has improved workability compared to traditional sheathing board products
  • Dimensionally stable, reliable airtightness
  • Quick and easy to cut and install saving time and reducing installed cost - With cement particle board, if you make a mistake, you have to start again from scratch. There’s no margin for error. But with GTEC Weather Defence, the cut was incredibly clean, you don’t need power tools, and you can install the board with two men instead of three because of its lower weight
  • Water, weather and mould resistant, can now be left installed and exposed for up to 12 months on site before you need to complete the final cladding
  • No need for cutting area, power tools or dust extractor
  • Can eliminate the need for breathable membrane saving time and reducing installed cost
  • Double BBA certified
  • Fully A1 non-combustible, compliant for structures above 18mtr


  • As a general external sheathing board
  • As an external sheathing board substrate for insulation boards

Technical data

  • Thickness - 12.5mm
  • Sheet size (WxL) - 1200x2400mm
  • Edge - Square
  • Composition - Aerated calcium sulphate di-hydrate with liners made from polymers and glass fibre with moisture and fire resistant fillers/fibres enclosed in gypsum core. Core and facers are bonded with starch. Edge glue is PVA. The board contains a water resistant additive and a biocide to inhibit mould growth
  • Appearance - Weather Defence is coloured purple on the front face and white on the back face
  • Compliance authority - Manufactured to BS EN 15283-1, Types GM-F, GM-H1, GM-I and CE marked accordingly
  • Physical properties / System performances - Strength to BS EN 15283-1: 12.5mm board, Longitudinal breaking load > 680N, Transverse breaking load > 310N
  • Moisture content - < 1%
  • Mass - 10.8kg/m² for 12.5mm board 860kg/m³ density
  • Thermal conductivity - 0.25W/mK to BS EN 12524
  • Thermal resistance, R - 12.5mm = 0.065m² K/W

Brand Siniat
Box Width 1200mm
Box Height 12.5mm
Box Length 2400mm
Weight 31.0000kg
Qty Per Pallet 52
Colour Purple
Finish Square Edge
Thickness 12.5mm

Data & Safety Sheets

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Unfortunately this product cannot be returned due to it being perishable or made to your specific requirements or another reason highlighted in our terms and conditions. Please make sure you are certain of your quantity ordered and it’s the exact product you require.

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