Foul gas will be able to migrate into the cavity spaces behind the membrane and will be able to escape into the building at the top edges of the membrane sheet, which must be left unsealed.
In the event of a pump station becoming inoperative, continual use of the sanitary appliances may result in the foul level rising above the normal operating level to the extent that effluent would back-fill the cavity drainage system and eventually escape into the cavities, resulting in contamination of floor construction.
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