Your building is losing valueevery wet season. We measureexactly how much.
No form fields on this page. A detailed scope-of-work consultation follows your assessment request.
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Podium tile — Central District · Subtropical algae & oxidation layer · 14 years accumulation
The surface tells you what the water must do.
Every façade material responds differently to pressure and temperature.
Before a single pump is primed, our senior technicians conduct a substrate classification survey across your entire building envelope. Mossy podium tile, diesel-stained loading bay concrete, and algae-streaked curtain wall panels each demand calibrated responses — the wrong pressure on aged granite cladding causes irreversible spalling. We document substrate class, contamination depth, and joint integrity before treatment begins.
Loading bay concrete — Kwai Chung logistics hub · Diesel & hydraulic fluid contamination · 8 years
Water alone is a blunt instrument.
The chemistry determines what the pressure can reach.
Diesel exhaust particulate embedded in loading bay concrete requires alkaline pre-treatment to break the hydrocarbon bond before water can flush it clean. Biological growth — the green-black algae endemic to Hong Kong's subtropical humidity — responds to biocidal pre-soak that kills at root depth, preventing re-colonisation within weeks. We maintain a closed chemical register, documented per project, and all discharge is pH-neutralised before entering the drainage system.
Curtain wall panels — Admiralty Grade-A tower · Algae colonisation & mineral deposits · 6 years
Your building sits inside a regulatory framework.
Non-compliant discharge is your liability, not ours.
Hong Kong's Water Pollution Control Ordinance places legal responsibility for wastewater discharge on the site owner. Contractors who flush untreated runoff into storm drains expose property managers to prosecution. Blast operates as an EPD-registered contractor — every project generates a discharge compliance certificate issued to the property manager for filing with the building's compliance record. We treat compliance documentation with the same rigour as the physical works.
Pre-war granite façade — Sheung Wan · AAB Grade II building · Heritage protocol applied
Pre-war granite does not forgive improvisation.
Irreversible surface damage voids insurance and destroys value.
Hong Kong's pre-war commercial stock — the granite-faced banking halls and arcaded shophouses of Central and Sheung Wan — requires pressure settings below 800 PSI, cold water application, and manual agitation with pH-neutral detergents. Our heritage protocol is documented, signed off by the property manager before works commence, and carried out by operatives with specific heritage-surface certification. We have restored surfaces that other contractors have damaged. We do not work from a single standard operating procedure applied to every building.
How we stripped 18 years of subtropical grime from a Grade-A tower in a single working day.
One-page technical brief covering substrate assessment methodology, chemical selection rationale, EPD discharge compliance documentation, and post-restoration surface readings. Written for property managers and their boards.
The brief beforeyou retain us.
Every engagement begins with a documented scope of work, not an estimate scrawled on a letterhead. Our professional indemnity insurance, EPD registration, and Buildings Department contractor status are verifiable before a single litre of water is pressurised on your site.
Retaining a specialist starts with one conversation.
Submit your building details on the assessment page. A senior consultant reviews your substrate class, identifies treatment protocols, and returns a documented scope of work — typically within 48 working hours.