Certified AS 3740 Waterproofing
Licensed application of Class III multi-coat polyurethane and cementitious waterproofing membranes with certificates provided for building compliance and surveyor sign-off. Engineered with bond breaker tapes and acoustic fall screeds.
Prevents inter-floor water ingress, structural joist rot, and warranty disputes by providing certified Form 16 compliance with hydrostatic flood tests.
Technical Specification Parameters:
Certified AS 3740 Waterproofing
Tolerance: Dry Film Thickness > 1.2mm | 24-Hour Flood Test Hold
Authentic Certified AS 3740 Waterproofing Installations
Examine our real-world craftsmanship across high-end Sydney architectural projects. Click any installation photo to inspect full-resolution mitre cuts, planar leveling, and joint finishes.
Certified Class III Polyurethane Wet Area Tanking
Dual cross-directional coats exceeding 1.2mm dry-film thickness
Acoustic Screed & Linear Flange Fall
Laser-calibrated 1:60 fall to puddle flange with acoustic rubber uncoupling
Hobless Shower Perimeter Bond Breaker Detailing
Continuous elastomeric perimeter bandage over wall-to-floor junctions
Recessed Niche Internal Corner Tanking
Triple-reinforced internal corners preventing stress cracks and leaks
AS 4654 External Balcony Multi-Tier Membrane
Termination bar detailing, perimeter overflow spuppers, and fall screed
Hydrostatic 24-Hour Flood Testing Verification
100% standing water pressure test before sign-off and Form 16 issuance
Our 4-Phase Installation Standard
Every project follows our strict Australian engineering workflow to eliminate drummy hollow sounds, lippage, and water ingress before tiles are placed.
Substrate Scrabbling & Priming
Floors vacuumed with HEPA extraction, shrinkage cracks chase-cut and epoxy primed, followed by deep-penetrating vapour barrier priming.
Bond Breaker System
Installation of Class III elastomeric bond-breaker tape across all 90-degree internal junctions, pipe penetrations, and puddle flange transitions.
Class III Dual Coating
Application of two cross-directional coats of high-solids polyurethane membrane, measured with wet-film gauge to guarantee minimum 1.2mm dry film thickness.
24-Hour Flood Test & Cert
Drains are sealed with pneumatic plugs and wet area is flooded with 50mm standing water for 24 hours to prove zero water penetration before tiling begins.
Frequently Asked Questions
Detailed engineering answers regarding Australian Standards, adhesive classes, and substrate prep.
Q1: What is an AS 3740 Certificate of Compliance?
It is an official legal declaration by a certified waterproofer confirming that wet areas have been sealed strictly according to Australian Standard AS 3740:2021, required by building surveyors and insurers for occupancy certification.
Q2: What is the difference between Class I, II, and III membranes?
Class III membranes have the highest elongation (>300%), allowing them to stretch with structural timber movement without tearing, unlike brittle Class I or Class II membranes.
Q3: Do you waterproof external balconies and rooftop terraces?
Yes. External balconies require compliance with AS 4654.2, featuring sub-screed membranes, termination bars, drainage cell baffles, and UV-resistant perimeter flashings.
Have a unique substrate or architectural blueprint requirement?
Speak directly with our senior tiler to review plans and technical specifications.
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