Master Waterproofing
Protect your property from structural decay with certified, engineered waterproofing and absolute cost certainty.
The Ultimate Defense Against Budget Blowouts
Water ingress is the most destructive and expensive failure an Auckland property can suffer. Remedial work for a failed membrane costs thousands and destroys finishes. At Flash Interior, led by a qualified Quantity Surveyor, we eliminate this risk. We don't guess membrane thickness or cut corners on curing times. We rigorously scope the correct material volumes, engineer the substrate preparation, and execute certified master waterproofing to ensure your property is protected and compliant for decades.
Internal Wet Areas
Fail-safe moisture control for bathrooms, showers, and laundries. We apply premium liquid and sheet membrane systems that integrate seamlessly with high-end tiling and modern plumbing fixtures.
External Balconies & Decks
Auckland's weather demands extreme durability. We engineer waterproof barriers for tiled decks, elevated balconies, and flat roofs, ensuring proper falls to waste to prevent pooling and structural rot.
Below Ground & Tanking
Protecting your foundations. We provide specialized negative and positive side tanking for basements, retaining walls, and lift shafts to stop hydrostatic water pressure from penetrating the structure.
Council Compliance & PS3
Absolute peace of mind. Our certified applicators provide full Producer Statement (PS3) documentation upon completion, guaranteeing your waterproofing meets stringent Auckland Council building codes.
Our Methodology
Risk Assessment & QS Scoping
We begin with a detailed moisture and substrate analysis, followed by an exact Quantity Surveyor calculation of required membrane volumes to guarantee appropriate coverage without budget waste.
Substrate Preparation
A membrane is only as good as what it bonds to. We meticulously clean, prime, and repair the substrate, ensuring all joints, penetrations, and corners have the correct bond breakers applied.
Multi-Layer Application
Our certified master tradespeople apply the specified waterproofing system according strictly to manufacturer technical data sheets, honoring precise drying and curing timelines.
QA Testing & Certification
We perform rigorous visual checks and, where required, flood testing. Once validated, we issue all necessary warranties and compliance documentation for your records.
