Below-Ground Waterproofing
Below-ground structures work against constant hydrostatic pressure with no access for repair once backfilled. Systems are selected for permanent immersion, not weather exposure.
What the works include
- Basement and retaining wall tanking
- Lift pit and sump waterproofing
- Blindside and pre-applied systems
- Construction joint waterbars
- Drainage board and subsoil coordination
- Negative-side remedial treatments
No second chance
Once backfill is placed, the membrane is inaccessible. Joint treatment, penetration sealing and drainage design carry as much weight as the membrane itself.
Engineered to keep water out.
Waterproofing is not painting membrane onto concrete. It is substrate science, detailing, sequencing and verification. Every VVS installation follows the same disciplined sequence.
Substrate Assessment
Moisture content, falls, cracking, laitance, contamination and existing membrane condition are assessed before any product is selected.
Preparation
Grinding, shot blasting, crack routing, patching and priming. Membranes fail on preparation long before they fail on product.
Detailing
Penetrations, drains, upturns, corners, movement joints and terminations are detailed to manufacturer specification first.
Membrane Installation
Torch-on, liquid-applied or sheet systems installed to specified wet-film and dry-film thickness across every coat.
QA & Inspection
Coverage records, batch numbers, photographic evidence and hold points documented through the installation sequence.
Testing
Flood testing and inspection coordination prior to any overburden, screed, tiling or protective layer being installed.
Protection / Handover
Protection boards, drainage cell and screed coordination, then handover documentation issued to the project team.
Recent works
Podium Deck Membrane
Belrose, NSW
Full podium deck membrane with drainage cell, protection layer and landscaping interfaces coordinated ahead of overburden.
Case Study
Coastal Roof Membrane
Byron Bay, NSW
Exposed roof membrane installed on a coastal building with full perimeter upstands, outlet flashing and UV-stable finish.
Case Study
Large Area Commercial Membrane
Adamstown, Newcastle, NSW
Continuous membrane installation across a large open deck with complex penetration and joint detailing.
Case StudyBelow-Ground Waterproofing in Sydney & NSW
Send through plans, specifications or photographs and we'll return a detailed scope and quotation.