When planning a rooftop solar installation in Malaysia, most people focus on system size, panel efficiency, and energy savings. But one of the most overlooked, yet critical, factors is waterproofing. In a country known for its heavy rain and high humidity, protecting your roof is not just about preventing leaks; it's about ensuring long-term structural integrity and system performance.

At i2 Energy, we’ve implemented tailored waterproofing systems across various commercial projects, such as for Tycoplas Sdn Bhd. Our aim is to make sure the roof lasts as long as the panels do; if not longer.

Why Waterproofing Matters

Malaysia experiences between 2,000 to 2,500 mm of rainfall annually, with high humidity levels throughout the year. Without proper waterproofing, roof surfaces are vulnerable to water ingress, which can damage both the roof structure and solar mounting systems. Water accumulation may also compromise insulation, trigger mold growth, and void roof warranties. For penetrative solar installations, the risk is even higher; every mounting point is a potential leak source if not properly sealed.

Common Waterproofing Solutions in Malaysia

• Torch-on membrane: a bitumen-based sheet that is heat-applied to the roof. It's popular for flat concrete roofs due to its durability and UV resistance. However, it requires skilled application and precise bonding to be effective in tropical environments.
• Polyurethane (PU) liquid-applied membrane: another modern option which forms a seamless, flexible coating. These are ideal for metal rooftops and irregular surfaces because they adapt to movement and offer strong adhesion. PU coatings are often chosen for industrial facilities where flexibility and fast curing times are important.
• ‍Acrylic coatings: offer a more affordable and environmentally friendly approach. They're water-based, easier to apply, and suitable for rooftops that don't require heavy-duty resistance. However, they may degrade faster under intense UV exposure and aren't ideal for high-traffic areas.
• ‍Cementitious waterproofing: a mixture of cement and proprietary additives. While it’s cost-effective and easy to apply, it can be brittle and prone to cracking, making it better as a base layer than a standalone solution.
• Hybrid systems: combining cementitious underlayers with a flexible topcoat (like PU or acrylic). This offers layered protection against both surface wear and structural penetration.

How i2 Energy Selects the Right Waterproofing System

At i2 Energy, we don’t take a one-size-fits-all approach. Every rooftop presents its own technical and environmental challenges whether it’s slope, material, age, or structural exposure. For example, in our rooftop solar installation at Tycoplas Sdn Bhd, a precision plastics manufacturer in Selangor, we implemented a waterproofing solution that accounted for the site’s industrial nature, roof condition, and long-term solar performance goals. Our priority is always to ensure the system remains watertight, structurally secure, and maintenance-friendly throughout its lifespan.

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Conclusion
‍Waterproofing isn’t a side task, it’s a fundamental part of any rooftop solar system in Malaysia. Done right, it ensures structural durability, prevents operational downtime, and safeguards your investment for decades to come.
Although all project may not require it, at i2 Energy, we treat waterproofing as a design consideration, not an afterthought. From membrane systems to advanced coatings, we apply solutions that work for your roof, your system, and your long-term sustainability goals.

Source:

• Malaysian Meteorological Department – Annual Rainfall Data