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...Chapter substructure contents basements walls below ground damp proofing floors functional requirements definition design for the purposes of this a basement is defined as storey or i and specifications shall provide clear indication storeys building that constructed partially entirely intent demonstrate satisfactory level performance ii be appropriately designed to ensure they workmanship adequately suitable barrier against contaminants gases water all must within tolerances in iii construction supported by structural manual calculations provided suitably qualified expert work carried out technically competent person iv details waterproofing techniques workmanlike manner prior commencement on site certification required any completed an approved v meet relevant regulations other installer statutory british standards euro codes vi baserments minimum materials grade standard bs vii should t echnical ts stored correctly which will not specialist cause damage deterioration product take re...