Lotus (Combo) System
1. Polyurethane Foam
after final surface inspection, spraying begins using a Spray Foam Machine with Polyurethane materials (Polyol & Iso PMDI). The foam is applied in 10–15 mm layers until the desired thickness is reached.With a density of 45 kg/m³, the foam fills cracks and edges, forming a seamless waterproof and thermal insulation layer. It solidifies within 30 seconds, providing strong and lasting protection.
2. UV Protection Coating
After applying the polyurethane foam, a flexible acrylic-based elastomeric coating (RBE) is applied over the entire surface to enhance waterproofing performance. This protective layer should be allowed to dry for at least 8 hours, depending on site conditions.To shield the polyurethane from UV radiation, a 600–800 micron layer of high-performance UV-resistant coating is applied as the final step, ensuring long-term durability and protection
3. Water Test
Once the UV protective coating has fully dried (minimum 24 hours), our engineer conducts a final site inspection to approve the flood test. A 5–6 cm water level is then maintained for 48 hours to ensure the system is completely leak-free and properly sealed.
4. Geotextile & Slope lines
After successful testing, water is drained and a geotextile layer is installed with 20–30 cm overlap, extending up vertical surfaces. The rooftop is then divided into 3×3 m sections using Compact Flexy Board to form slopes and movement joints.We recommend installing a rainwater outlet for every 100 m². The surface is further sectioned into 6 m² compartments using 12 mm Flexcell Boards, fixed vertically with sand-cement mortar to maintain slope and ensure durability.
5. Concrete Screed
After ridge installation, skilled masons apply a fiber-reinforced screed (20 N/mm², 250 OPC, 0.6 kg/m³ fibers) in 80 mm thick panels to ensure proper slope and surface durability. The screed is smoothly finished and cured for at least two days to prevent cracks and ensure long-term performance.
6. Preparation Of Angle Fillet (Skirting)
Once the screed is fully cured, joints from the flex cell board are reopened and sealed with ACT sealant over a 20 mm backing rod to allow for movement. A 100×100 mm angle fillet is cut around parapet edges and foundations.The roof skirting is finished and protected by applying four layers: self-flashing polyurethane edges, mortar for strength and shape, fabric reinforcement with bonding to prevent cracks, and a final acrylic protective coating.
7. Mastic PU Sealant
Once the screed has set, Compact Flexy board is cut from the top, a backing rod is installed, and sealant is applied to seal the expansion joints, giving your roof the best protection against leaks.
8. Final Coat ( Cementitious)
Saturate the concrete surface with clean water after finishing the joint treatment, curing the applied angle fillet, and cast screed. To avoid dampness of the substrate, two coats of cementitious coating Polyflex (White) will be applied above the surface. Before allowing any traffic on the roof, the final coat will be allowed to fully cure for 7 days. The roof will look nice with the topcoat on it.