WeatherPlank is a fibre cement reinforced calcium silicate board, which is
produced from a mixture of cement, silica, special cellulose fibres and
selected fillers to impart durability, toughness and moisture resistance.

It 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.

WeatherPlank will not rot or support fungal growth and is unaffected
by sunlight or steam. It does not contain any soluble ingredients or free
 alkali which could be dissolved by moisture or condensation causing
unsightly marks. If exposed to moisture, WeatherPlank will completely
recover on drying out naturally, with no permanent loss of strength.

It 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.