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4131 Sheet tanking (106)
Impermeable flexible and rigid sheet materials applied cold or torched, to floors and walls in single
or multiple layers, to internal and external surfaces, including under bathroom floors and other wet
areas and inside concrete watertanks
4132 Drainage cell sheet damp-proofing (7)
Damp-proofing of flexible drainage cell sheets, applied to external surfaces
4133 Sheet membrane water management systems (24)
Internal system for controlling entry of water, usually through existing structures. Consisting of multiple layers of impermeable flexible sheet materials, filter materials and drainage layers applied to floors, walls and roofs. Water taken away by combinations of pipes, sumps and pumps.
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