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.
Apply high-performance waterproofing membranes (Betoflex 4P/5P, Betoflex HPS, or Betocoat PU) engineered for seamless water barrier protection and long-term substrate durability.
Apply cold-applied thixotropic rubberized bitumen emulsion (Betocoat RBE 1000/15/10) over basement retaining walls, footings, and substructures as a damp-proof chemical barrier against aggressive groundwater salts.
Apply seamless elastomeric polyurethane liquid membrane (Betocoat PU) or 2K cementitious slurry (Betoflex CM 588) across balcony slabs, podium decks, and planter boxes, ensuring 100% seamless continuity up parapet upstands.
Embed high-tensile extruded PVC waterstops (Betostop ICJ/ECJ/IEJ/EEJ) into concrete expansion and construction joints during pouring to stop high hydrostatic water ingress, and reinforce internal corners with fiberglass mesh (Betotec Mesh 65).
Seal expansion joints, parapet flashings, and perimeter terminations with high-movement single-component polyurethane joint sealant (Betoseal 1PU, movement +/-25%) or 2-part polysulfide sealant (Betoseal PS PG).
Install non-woven needle-punched polyester geotextile filter fabric (Betotec 120-1000 GSM) as a protective cushion and drainage filtration layer above waterproofing membranes and under ballast.
Specification Hubs
Matching System Products & Functional Roles
SBS Modified Bitumen Membrane - Plain
Request a system specification for your project
Request a direct calculation, material sample board, typical submittals, or project design validation for this assembly.
Request Technical Assistance