Cembrit Windstopper Extreme

Sheathing board with exposure and fire resistance. Can be left exposed to the elements for up to 12 months.

Colours & Measures

Cembrit Windstopper Extreme

Selected colour: Natural Grey

Free sample: Natural Grey

Natural Grey
All Cembrit product colours presented on the website are representative and might vary from the original product colours.
Colour Thickness Width Length
Natural Grey 9 mm 1200 mm 2700 mm
Natural Grey 9 mm 1200 mm 2400 mm
Natural Grey 4.5 mm 1200 mm 2400 mm

Cembrit Windstopper Extreme

Guaranteed and tested fire and weather resistant sheathing board

Cembrit Windstopper Extreme is a breathable sheathing board with a 90/90 fire rating. The board's composition is designed to absorb and release moisture without affecting the durability, strength or performance of the board. Windstopper Extreme is available in 2 thicknesses 9mm and 4.5mm. Lightweight 4.5mm can be scored and snapped making for rapid, dust-free installation and is ideal as a temporary cladding.

Both thicknesses provide good acoustic insulation. Specially designed sealing tape (with 12 month UV stability) seals joints and edges providing complete weatherproofing of the building. When installed according to Cembrit installation instructions, Cembrit Windstopper Extreme will function as a temporary facade for up to 12 months, EN12467 category class A.

Product features:

Technical data

Coating and surface

No coating 



Fixing - aluminum

Not applicable for this product

Fixing - steel

Cembrit Windstopper Extreme is fastened with Cembrit SCR-S 4.2x30 mm Universal screw on a steel frame. No pre-drilling is needed. 

Fixing - wood

Cembrit Windstopper Extreme is fastened with Cembrit SCR-W 3.9x38 mm Universal screw on a wood frame. No pre-drilling is needed.


Fibre cement


Cembrit Windstopper products consist of natural materials and variations may occur in the product colour or other characteristics from board to board.

90/90 Fire Rating BS EN 1364-1:2015

The board achieves 90/90 (1.5 hour) Cembrit Windstopper Extreme 9mm fire integrity and fire insulation as part of a fire rated building element in accordance with BS EN 1364-1:2015

Fire tested up to 120 minutes

Resists fire adjacent to the board in a fire rated building element in accordance with in accordance with BS EN 1364-1:2015

Can be left exposed for 12 months

Makes the construction weatherproof so that internal works can continue even if there are delays on completion of external works.