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Description

External sheathing board system, featuring a gypsum board faced with water-repellent material for superior weather protection. It is strong, highly moisture-resistant and A1 non-combustible. Weather Defence is a faster way to a weathertight building, compared to traditional sheathing board products.

Suitable for use with steel frame systems, timber frame structures and steel infill panels. Six months exposure warranty.

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).