Basement, Foundation & Concrete Waterproofing
Below-ground waterproofing has to resist hydrostatic pressure, ground chemistry and the substrate it is bonded to. New-build basements use crystalline admixtures, internal tanking or external membranes; remedial work uses negative-side cementitious tanking, crystalline applications and PU injection at the actual ingress points.
Common defects we treat
- Damp or trickling basement wall and floor
- Efflorescence and rust staining on basement soffits
- Wet lift pit floor with active groundwater seepage
- Leakage at construction joint between basement wall and slab
- Damp ground-level concrete tank wall
Method on site
Survey and water-table assessment
Water flow pattern, joint condition, crack pattern and existing finish recorded. For new build, joint layout and waterstop continuity reviewed against the design.
Active leak control
Active points stopped with PU injection or hydrophilic gel before the surface system is applied. A surface system over a live leak will fail.
Substrate preparation and tanking
Substrate cleaned and roughened. Cementitious tanking applied in two coats at right angles, with full continuity at floor-to-wall junctions and penetrations.
Curing and finish
Tanking cured per data sheet, then finished with protection screed or sacrificial render. Drainage layer where the design calls for one.
Inspection and monitoring
Walls and slabs monitored over an agreed period. Any further ingress treated by injection through the cured tanking.
Materials we use
- Crystalline waterproofing admixtures and topical coatings
- Cementitious tanking systems for negative-side application
- PU and acrylic injection resins for active leaks
- Hydrophilic waterstops at new construction joints
Deliverables to the client
- Survey report with leakage map
- Method statement aligned with SS 637 for below-ground waterproofing
- Material data sheets and joint detail drawings
- Monitoring note for the building owner