From Weathertex

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To provide the best protection for your wall against moisture related problems Weathertex highly recommends the use of a cavity fixing system. A cavity system creates a space within the wall that allows airflow to remove any moisture that accumulates in this space either from wind driven rain or condensation. Fixing your Weathertex cladding using the cavity system provides the best defence for your internal lining, frame, insulation and cladding against the damaging effects of moisture. If the cavity system is not the chosen method of construction, sufficient ventilation within the wall must be otherwise provided or warranty may be void. When designing for cold climates or buildings with a high internal vapour pressure, a vapour barrier on the interior side of the frame may be required in addition to the breather membrane on the exterior face of the frame. In such cases, the advice of the vapour barrier manufacturer should be sought.