Some, but not all, membrane products can be used under cladding. Membranes can be used to help control moisture within the building. When used in this capacity, breather membranes are critical to a structure's makeup as they allow the building to "breathe." Other types of membranes work in conjunction with insulation to create a vapour barrier for condensation control. Poor moisture management can lead to mould problems. But the use of a membrane really depends on the type of cladding material and building structure. For example, fibre cement or metal sheet cladding, have a low moisture buffering capacity and are often constructed without a cavity behind the cladding.