The Essential Guide to RC Roof Washing Works in Singapore
Maintaining a Reinforced Concrete (RC) roof is vital for any property owner in Singapore. Given our tropical climate—characterized by intense UV rays and heavy monsoons—dirt, algae, and debris can quickly accumulate. If left uncleaned, this buildup can lead to ponding water and eventually compromise your roof's waterproofing.
At High Tech Roofing, we believe that a clean roof is the first line of defense against leaks. Here is our professional guide on how to safely and effectively conduct RC roof washing works.
Phase 1: Pre-Washing Safety & Preparation
Before any water hits the surface, safety and protection are the top priorities.
- Electrical Safety: RC roofs often house outdoor AC units or solar panels. Ensure all electrical power to these units is switched off or properly shielded with waterproof covers to prevent short circuits.
- Personal Protective Equipment (PPE): Our team always utilizes BCA-compliant safety gear, including helmets, non-slip waterproof boots, gloves, and safety goggles to protect against high-pressure backspray.
- Work Area Protection: Identify any sensitive equipment or landscaping below the roofline. Use tarps to protect areas that might be affected by overspray or runoff.
Phase 2: Professional Inspection
Never wash a roof without inspecting it first. Washing a damaged roof can actually cause more harm than good.
- Check for Cracks: If there are visible cracks or "hollow" spots in the concrete, high-pressure washing can force water into the structure, causing immediate leaks.
- Cleaning Agents: For stubborn stains or algae, we recommend mild, concrete-specific detergents. Avoid acidic cleaners, as they can chemically erode the concrete surface and damage existing waterproofing membranes.
Phase 3: The Equipment Setup
To achieve a deep clean without damaging the substrate, the right tools are essential:
- Pressure Settings: We typically use a high-pressure washer between 2000 to 3000 PSI.
- Nozzle Choice: A rotating "turbo nozzle" is often the best choice. It dislodges dirt efficiently without focusing a single stream of water on one spot for too long, which prevents "etching" or scarring the concrete.
Phase 4: The RC Roof Washing Process
- Top-to-Bottom Strategy: Always start at the highest point of the roof and work your way down toward the drainage points. This prevents clean areas from being re-contaminated by dirty runoff.
- Angle & Distance: Keep the nozzle at a 45-degree angle and maintain a distance of about 30cm from the surface.
- Constant Motion: Never let the pressure stream linger on one spot. Persistent pressure in a single area can weaken the concrete and wear away the protective surface.
Phase 5: Post-Wash Care & Waterproofing
Once the roof is clean, the job isn't finished.
- Post-Wash Inspection: With the dirt gone, "hidden" cracks often become visible. This is the best time to identify areas that need minor repairs.
- Sealing & Waterproofing: After the RC roof has dried completely, we highly recommend applying a professional-grade sealer or a fresh layer of waterproofing. A clean surface ensures maximum adhesion for the new coating, extending your roof’s lifespan by years.
Expert Roof Cleaning Tips
- Check Your Drainage: Ensure gutters and downpipes are clear before you start. High-pressure washing moves a lot of silt; you don’t want to clog your pipes!
- Watch the Weather: In Singapore, it’s best to perform washing on a clear day so the roof can dry quickly, allowing you to spot any remaining stains or structural issues immediately.
Is your RC roof looking dull or showing signs of algae growth? Don't wait for the next storm to find a leak. Contact High Tech Roofing & Waterproofing today for a professional inspection and cleaning service.
📞 Call/WhatsApp Us: (+65) 8292 6757 🌐 Visit Us: www.hightechroofing.com.sg
High Tech Roofing – Your BCA Registered Roofing Specialists in Singapore.