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Exterior applications:

  • Timber and steel frame system lining board.
  • Render carrier board (approved for use as a render carrier board by Wetherby Building Systems and K-Rend).
  • External wall insulation carrier board.
  • Temporary hoardings.
  • Fascia and soffits.

Interior applications (partitions, ceilings and wall linings):

  • Kitchens and wet rooms.
  • Splashbacks.
  • Bathrooms.
  • Shower and bath enclosures.
  • Steam rooms and saunas.
  • Swimming pool ceiling and wall linings.


A non-combustible, A1 fibre cement board, combining weather, moisture and fire resistance properties with high impact strength, sound insulation and dimensional stability. WeatherKem should be primed prior to applying paints and plasters.

Features and benefits:

  • 30 years + service life (tested for thickness 6, 8, 9, 12, 15, 16 and 18 mm).
  • Rated as a Category A board to BS EN 12467:2012+A2 2018 for applications where they may be subjected to heat, high moisture and severe frost.

General information




Fibre cement




2400 mm


1200 mm


6 mm

8 mm

9 mm

12 mm

15 mm

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Pr_25_71_11_25 Fibre-reinforced cement boardsPrimary


K11/845 Cement-bonded particleboard

H20/150 Sheet cladding

H20/155 Sheet cladding

K11/485 Wall sheathing

K11/795 Wall lining on metal framing

K11/890 Board

K40/270 Boards

K45/350 Boards

M40/470 Intermediate substrate

M40/27 Intermediate substrate

K11/63 Cement-bonded particleboard

H20/10 Sheet cladding

K11/60 Board

Specification data - Fibre-reinforced cement boards


To BS EN 12467.

Fire rating

To EN 13501-1: 2007 + A1: 2009, A1.


Weather resistance

To BS EN 12467, category A.

Sheet size


Nominal thickness

6 mm.

8 mm.

9 mm.

12 mm.

15 mm.

16 mm.

18 mm.


2400 mm.


1200 mm.



Finish as delivered

Manufacturer's standard.




Not required.

Kemwell Non-Combustible Joint Seal Kit.

The Joint Seal Kit has been specifically designed to create an airtightness seal on Kemwell's range of external sheathing boards. Each kit will provide 100 linear metres.

  • 10 tubes of Kemwell KemStop FR Flexi Sealant (coverage of 3 mm x 10 mm = 1 tube provides 10 linear metres).
  • 3 rolls of 40 m long x 60 mm wide, Kemwell Ampacoll Flexx Acrylic Adhesive Tape (covers 120 linear metres).

KemStop FR Flexi Sealant.

Kemwell Ampacoll Flexx self-adhesive tape.


Ejot TBF 4.8

Recommended by the manufacturer for fixing 9 or 12 mm WeatherKem to SFS framing.

50 mm long, 3.35 mm diameter nails.

For external linings on a timber frame.

M4 self-tapping, self-drilling screws.

For external linings on a steel frame.

Corrosion resistant M4 screws.

For installation of WeatherKem as a tile backer board for floors and walls.


WeatherKem Installation Guide 2021

WeatherKem Installation Guide 2021

WeatherKem Technical Data Sheet

WeatherKem Technical Data Sheet

Third party certifications

BBA Agrément Certificate

BBA Agrément Certificate

WeatherKem Sheathing Board

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