Guardex sheathing board A non¬combustible, light weight, environmentally¬friendly and mould, water, fire resistant offering superior air permeability. Thanks to the specially designed cellulose glass cloth and composition of the core, has a high resistance to moisture, mold, and minimal expansion and contraction to temperature fluctuations, resulting in excellent handling in any condition. They can remain exposed, up to 12 months, depending on the sealing of joints, to the completion of the work in the building, regardless of external conditions. The Knauf Guardex boards are placed from the outside to the external masonry or as external wall paneling which will be covered with the Knauf Thermoprosopsis external insulation system and external masonry systems which are covered with systems of decorative ventilated facades.