Wetroom Tanking Kits Are Use To Waterproof Bathroom Walls & Floors Before Tiling. Wetroom Tanking Kits Can Be Used For wetroom Or Basic Bathrooms For Extra Protection. To conform to the British Standards Institute (BSI) for BS 5385-1 tanking membrane must be used in all wetroom and all tiled shower enclosure and shower baths even if moisure resistant plaster board is used. To find out more Click British Standards Institute (BSI) for BS 5385-1