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| Introduction | Description | Sizes | Manufacturing Tolerances | Performance | Specific Properties | Application | Health & Safety




WeatherPro®-L is an autoclaved fibre cement reinforced calcium silicate board (alias as fibre cement board in North America) that is 100% free from asbestos, sepiolite, inorganic fibres or formaldehyde. WeatherPro®-L is specially designed for use in applications where impact resistance is required in a high humid environment. It is a versatile, economic building board substitute of plywood, cement-bonded particle board, gypsum boards or magnesium boards. It is light weight, robust and moisture resistant. It will not warp, swell or decay in wet area.

WeatherPro®-L is an excellent substrate for ceramic tiles. It can be applied in direct weathering  applications when used in conjunction with external grade paint finishes. The board is manufactured to ISO 9001 quality management system and ISO14001 environmental management system, and has obtained the Green Product Label Award issued by National Environment Protection Bureau.




WeatherPro®-L is produced from a mixture of cement, ground sand, special cellulose fibres and selected fillers to impart durability, toughness and moisture resistance. The board is then cured by an autoclaving process whereby the ingredients are reacted together under the effects of super-heated steam and high pressure. The synthetic cement silicate binder provides exceptional dimensional stability and an unrivalled resistance to movement due to effects of moisture or heat. The board will not rot or support fungal growth and is unaffected by sunlight or steam. The board does not contain any soluble ingredients or free alkali which could be dissolved by moisture or condensation and causing unsightly marks. If exposed to moisture, the board will completely recover on drying out, with no permanent loss of strength. The board will not degrade with time and within normal applications, the life of the product is limited only by the durability of the supporting structure and materials used in fastening. WeatherPro®-L is natural off white in colour and has a smooth finish on one side and a slightly textured reverse.





6 / 9 / 12 / 15mm ~ 25mm


900 / 1200 / 1220mm

Lengths 1800 / 2400 / 2440 / 3000 / 3050mm

Note: Other sizes are also available and can be produced to special order.



Manufacturing  Tolerances 


Length tolerance +/- 5mm
Width tolerance +/- 5mm
Thickness tolerance +/- 0.3mm
Diagonal tolerance +/- 5mm






WeatherPro®-L is fully tested to the latest European Standards. It is a CE marked green building product.

Physical Properties

Apparent Density

BS EN 12467

1300 kg/m3 +/-5%

Nominal weight


8.60 kg/m2 6mm
12.90 kg/m2 9mm
17.20 kg/m2 12mm

Surface alkalinity


pH 7-10

Flexural strength

BS EN 12467

9.48 MPa (along grain / transverse )
14.07 MPa (across grain / longitudinal )
11.75 MPa (average of directions)

Bending modulus

BS EN 12467

7100 MPa
8300 MPa

Moisture movement (ambient to saturated)



Dimensional changes in length due to relative humidity

BS EN 318

+ 0.03% @20C, RH 30%~85%
- 0.027% @20C, RH 85%~30%

Moisture content

by weight

Ex works - 15%
In situ - 5%

Water absorption capacity

by weight


Thermal conductivity

EN 12664
JC/T 564

0.34 W/mk
0.26 W/mk
0.20 W/mK

Linear thermal expansion

BS EN ISO 10515-8

-3.4 x 1E-7/C

Fire Performance

Resistance to continuous heating




BS EN ISO 1182
BS476: Part 4
JIS A 1321


Heat of combustion

BS EN ISO 1716


European Building Classification

EN 13501-1

Euro Class A1 & A1Fl

Durability & Aging Performance

Durability and strength tests

BS EN 12467

Category A sheet, intended for applications where is subject to heat , high moisture and severe frost

Water impermeability

BS EN 12467
ASTM C1185

Filled with water after 7 days, no leakage or any water drops (24 hours required by ASTM C1185)

Heat-Rain test

BS EN 12467

No damage or leakage after 50 cycles of test with radiant heat 60C

Warm water test

BS EN 12467

Pass, in water at 60C for 56 days

Soak-Dry test

BS EN 12467

Pass for 50 cycles of test

Freezing and thawing test

BS EN 12467

-No alteration nor de-lamination after 100 cycles of test at temperature of -20C ~ 20C

Load Bearing Resistance Performance

MOH’s Hardness

EN 101

Hardness No 2 ~ 3

Impact test

BS EN 1128


Uniformly distribution load test
(Clear span at 550mm)

BS EN 1195
BS 6399 Table 1

24mm board - 35 N/m2

Concentrated load test
(Clear span at 550mm)

BS EN 1195
BS 6399 Table 1

24mm board - 8 KN

Deflection subject to Uniformly distribution load at 3KN/m2
(Clear span at 550mm)

BS EN 1195
BS 6399 Table 1

20mm board
No visible damage

Acoustic Performance

Acoustic insulation

AS 1276.1
AS 1191
BS EN ISO 140-3
BS EN ISO 717-1


Rw, dB











88mm steel stud partition



Environmental Friendly

Green labeled building board


Tested & certified by
Singapore Environmental Council Hong Kong Green Council
National Environmental Bureau

Organic emission

ASTM D5116-06

Non toxic & satisfied the emission tests

Recyclable product

ISO 14001

Crushed down for recycle use,
Products made under ISO 14001 environmental management system



Specific  Properties 

Acoustic insulation Good mechanical resistance and rigidity
Decorative finished by tiles, paint or wall paper Lightweight but strong
Easy to use Maintenance friendly
Excellent dimensional stability Non-combustible
BS476: Part 4
BS EN ISO: 1182
Euro Class A1
Forst resistance (passed freeze / thaw test) Rot proof, anti-bacterial, resistance to insects and mould growth
Good chemical reistance Weather resistance




WeatherPro®-L can be used in a wide variety of building applications because of its easy working, fixing and decorating characteristics. Typical applications include:

  • Roofing substrate panels
  • Impact and acoustic wall & ceiling panels
  • Internal and external wall linings
  • Bathroom and shower partitions
  • Kitchen and Laundries
  • Ceramic tiles backing boards
  • Domestic decking applications such as
  • balconies, verandahs and pool surrounds
  • Bus bar or electrical protection
  • Cooling tower linings
  • Facades, planking and shingles
  • Parapet linings
  • Sunscreens
  • Floor tiles / composite floor panels
  • Sanitary cubicles
  • Decorative and moisture resistant ceiling



Health & Safety 


WeatherPro®-L is formulated without asbestos or sepiolite or any inorganic fibres. When using power saws or sanders in a confined space, dust extraction equipment is recommended to control dust levels. WeatherPro®-L is designed for non-load bearing construction. Horizontal boards or ceiling panels must not be walked on as they are not designed to take additional loads between supports; if there is a risk of this occurring, warning notices should be displayed. Fixers must ensure that they work from adequate and safe platforms where necessary.

Note: All physical performance values of products depicted in this catalogue are averages based on the standard production. The figures may be changed dependent on the test method used.

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