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Glasroc X, External Sheathing Boards

Minster and British Gypsum have joined forces to bring you a series of products designed to make your life easier. The Glasroc X Sheathing Board is lightweight, easy to score and fast to install. Therefore, fit out can begin sooner ultimately reducing total installed cost. It provides 6-month BBA certified weather protection to steel frames, when fitted with Glasroc X screws and Glasroc X sealant.

Close up of Glasrox X board
What is Glasroc X external sheathing board?

Glasroc X is a high performance external sheathing board that provides 6 months weather protection as certified by the BBA.

BBA certificate 17/5453

Key features and benefits:

  • Glass tissue surface achieves A1 non combustible reaction to fire performance to EN 13501-1 for fire safety
  • 35% lighter than cement boards and easy to cut, improving on site installation, handling and reducing mess.
  • Dimensionally stable 0.1 mm/m to aid in maintaining weather protection and air tightness performance.
  • Glasroc X is also 100% recyclable and can be collected via the British Gypsum recycling service, contributing towards waste requirements.

Use Glasroc X screws and Glasroc X sealant to maintain full system benefits

Unlike cement boards, gypsum sheathing solutions can be cut without the need for specialist cutting or dust extraction tools. The Glasroc X external sheathing boards are easy to fit and install especially with:

Glasroc X Screw
Glasroc X Screws

Glasroc X Screws are waterproof and specially designed for external wall requirements.

Glasroc Silicone Sealant
Glasroc X Silicone Sealant

Glasroc X Sealant requires a 6mm bead around the perimeter of the boards and to be filled into screw holes.

*The screws and sealant are necessary for the BBA 6 month weather proofing.


Only British Gypsum systems give buildings the protection of their SpecSure® lifetime warranty.

SpecSure® is a unique warranty that confirms British Gypsum proprietary systems will perform as specified for the lifetime of the building.

Find out more
Close up of Glasrox X board

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