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Description

An external sheathing board, faced with water repellent material for superior weather protection. Strong, highly moisture resistant and A1 non-combustible. The system is a faster way to a weather tight building compared to traditional sheathing board products. Complies with BS EN 15283 Type GM-H1, GM-I and GM-F.

Features and benefits:

  • Dimensionally stable, reliable airtightness.
  • Quick and easy to cut and install saving time and reducing installed cost.
  • 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 18 m.

General information
Material

Aerated calcium sulfate di-hydrate with liners made from non-woven tissue with fillers and fibres enclosed inside gypsum core. Core and papers bonded with starch. The board contains a water-resistant additive and a biocide to inhibit mould growth

Uniclass 2015 External wall sheathing systems (Ss_25_25_95_28)
Specification data
Product Reference

Siniat Weather Defence Systems

Sheathing board

One 12.5 mm-thick Weather Defence Board

Two 12.5 mm-thick Weather Defence Boards

Internal board(s)

One 12.5 mm-thick GTEC Aqua Board

One 12.5 mm-thick GTEC Fire Boards

One 12.5 mm-thick GTEC LaDura Boards

One 12.5 mm-thick GTEC Megadeco Boards

One 15 mm-thick GTEC Aqua Boards

One 15 mm-thick GTEC Fire Boards

One 15 mm-thick GTEC LaDura Boards

One 15 mm-thick GTEC Megadeco Boards

Two 12.5 mm-thick GTEC Aqua Boards

Two 12.5 mm-thick GTEC Fire Boards

Two 12.5 mm-thick GTEC LaDura Boards

Two 12.5 mm-thick GTEC Megadeco Boards

Two 15 mm-thick GTEC Aqua Boards

Two 15 mm-thick GTEC Fire Boards

Two 15 mm-thick GTEC LaDura Boards

Two 15 mm-thick GTEC Megadeco Boards

Accessories

None

Resilient bar

Standard product features

Material:

Aerated calcium sulfate di-hydrate with liners made from non-woven tissue with fillers and fibres enclosed inside gypsum core. Core and papers bonded with starch. The board contains a water-resistant additive and a biocide to inhibit mould growth.

Size (w x l):

1200 x 2400 mm.

Thickness:

12.5 mm.

Technical properties:

  • Nominal weight: 10.8 kg/m².
  • Density: 860 kg/m³.
  • Thermal resistance (R-value): 0.065 m²K/W.
  • Thermal conductivity (K-value): 0.25 W/mk.

Insulation:

50 mm thick, 45 kg/m³ density rock mineral wool (supplied by others).

Sealing:

GTEC Fire Rated Silicone Sealant and Weather Defence Joint Tape.

Acoustic performance:

Dependent on system build-up.

Fire performance (to BS 476-22):

Dependent on system build-up.

Product Options

Suitable framing:

  • Steel: 100 x 35 x 1.2 mm (minimum).
  • Timber: 140 x 38 mm (minimum).

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