Substructure Hydrostatic Pressure Challenge
Substructures are subjected to hydrostatic water pressure, aggressive soil chemicals, high sulfate/chloride contents, and potential radon gas intrusion. Water ingress through construction joints or concrete cracks causes corrosion of steel reinforcement, compromising the building's structural integrity. Specifiers require heavy-duty barriers that can withstand soil settling and form a continuous wrap around the foundation.
Application Selection Guidance
For blindside applications (pre-applied below raft slabs and behind shoring retaining walls), specify Geobit HDPE pre-applied waterproofing membranes. These feature an active adhesive layer that forms a mechanical bond with the poured concrete, preventing lateral water migration. For accessible positive-side walls, apply a dual system comprising high-build rubberized bitumen emulsion coatings (RBE) protected by bituminous protection boards or a heavy-duty self-adhesive SBS membrane. Ensure continuous PVC waterstops are cast into all construction and expansion joints.
Clean, sound blinding concrete slab prepared with smooth chamfers and corner fillets.
HDPE pre-applied waterproofing membrane for raft slabs and SBS elastomeric membranes for vertical retaining walls.
Heavy-duty internal and external PVC waterstops installed across cold joints.
Self-adhesive bituminous protection board shielding vertical wall membranes during soil backfilling.
High-grade bitumen mastic or polysulfide joint sealant for pipe penetrations and tie-rod holes.
Non-woven geotextile separation membrane with drainage channel backfill.
Specification Hubs
Matching System Products & Functional Roles
SBS Modified Bitumen Membrane - Plain
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