External Sheathing Boards for Weather-Resistant Performance
External sheathing boards are designed to protect wall structures during the construction phase and provide a high-performance substrate for external finishes. These boards offer moisture resistance, dimensional stability, and durability, making them ideal for façade systems in all weather conditions.
Products in This Category

fermacell Powerpanel H2O
Durable, moisture-resistant cement board with laminated design and glass fibre mesh reinforcement, ideal for wet indoor or outdoor areas.
- Thicknesses: 12.5 mm
- Widths: 1000, 1200 mm
- Lengths: 1200, 2600mm
- Edge: SE
Siniat Weather Defence
A glass-reinforced gypsum sheathing board used for external walls — BBA Certified, breathable, and water-resistant.
- Thickness: 12.5 mm
- Width: 1200 mm
- Length: 2400 mm
- Edge: SE
- Fully A1 non-combustible
![British_Gypsum_Logo_RGB-210x50[1]](https://gointeriors.co.uk/hs-fs/hubfs/Supplier%20Logos/British_Gypsum_Logo_RGB-210x50%5B1%5D.png?width=210&height=50&name=British_Gypsum_Logo_RGB-210x50%5B1%5D.png)
British Gypsum Glaroc X
A robust glass-mat gypsum sheathing panel designed for façade systems, offering excellent weather protection during construction.
- Thicknesses: 15 mm
- Widths: 1200 mm
- Lengths: 2400 mm
- Edge: SE
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