Material covered by this specification forms a waterproofing system to be applied to selected areas of a bridge substructure.
.All substructure waterproofing systems intended for use under this specification must be prequalified. Submit a written request to the Bureau Chief of Construction and Materials, with the following information for each type and brand name being offered.
Substructure Waterproofing system provides a “protected membrane” system which usually incorporates a drainage board. Is fully bonded to the “POSITIVE” side of the structure, usually concrete and covered with an IKO Plasdrain drainage board and then structural concrete, backfill etc to suit performance criteria.
Substrate Waterproofing designs often includes the vertical surface of external walls of underground car parks and storage areas. A vertical drainage board is recommended to provide drainage and protection for the vertical waterproofing. A drainage system should be incorporated at the base of the wall to allow for the free flow of any water build up in the ground.