In the high-rainfall environment of Kuala Lumpur, a Gravity Vent Curb is the most critical interface between your building’s ventilation and its structural shell. The curb is the raised "box" that elevates the ventilator above the roof line, providing a mounting point and a primary defense against tropical deluges. In 2026, over 60% of commercial roof leaks in Malaysia are traced back to improper curb installation—either due to poor "flashing" or structural deflection that causes water to pool.
As part of a Ventilation Systems Audit, EKG provides precision-engineered curb installations and restorations to ensure your roof vents are both "Air-Efficient" and "Water-Tight."
A vent curb must do more than just hold up a hood; it must manage severe hydraulic and aerodynamic loads:
The "Splash-Back" Height: In KL, a curb must be a minimum of 300mm high. This prevents heavy "bounce-back" rain from being sucked into the intake or washing over the top of the curb during a monsoon.
Internal "Curb-Liner" Insulation: We use 25mm Rigid Fiberglass or Armaflex lining inside the curb. Without this, the temperature difference between the hot roof and the cool indoor air causes "Condensation Rain" to drip onto your ceiling.
Structural Load Distribution: A heavy Galvanized Steel Relief Ventilator can weigh over 150kg. We ensure the curb is integrated into the roof purlins, not just the metal decking, to prevent the roof from "sagging" and creating a permanent leak point.
We treat curb installation as a fusion of mechanical engineering and high-performance roofing:
Double-Flashing & "Cricket" Installation: We install a "Cricket" (a triangular water-diverter) on the high side of the curb. This prevents water from "damming" up behind the vent, which is the #1 cause of rust in metal roofs.
Marine-Grade Poly-Hybrid Sealants: We move away from cheap silicone. We use High-Build Polyurethanes that remain flexible under KL’s 70°C roof temperatures, ensuring the seal doesn't "crack" after one season.
Cant-Strip Integration: We use "Cant Strips" (angled transitions) at the base of the curb. This allows the roofing membrane or metal flashing to transition smoothly without sharp 90-degree bends that eventually fatigue and split.
Thermal Bridge Audit: We use Thermal Imaging to ensure the curb isn't acting as a "Heat Path" into your building. A poorly insulated curb can increase your local AC load by 2-3%.
Curb installation quality directly impacts the efficiency of your Variable Frequency Drives (VFDs) on your mechanical fans.
Reducing "Turbulence Drag": If a curb is installed crooked or with internal obstructions, it creates "Air Eddies" that force the fan to work harder.
The Logic: By ensuring a "Slick" internal throat during curb installation, we lower the static resistance (P) of the air path. Because of the Cube Law, reducing the "Entrance Resistance" so the fan can run 10% slower reduces your daily mechanical energy consumption by nearly 30%.
| Component | Maintenance Standard | Failure Symptom |
| Curb Height | Min 300 mm | Water Ingress during Heavy Rain |
| Internal Lining | 25 mm Insulated | Condensation Drips / Ceiling Mold |
| Corner Seams | Fully Welded/Sealed | "Ghost Leaks" inside Insulation |
| Flashing / Cricket | Water-Diverting | Rust Puddles on High Side of Vent |
| Structural Ties | Bolted to Roof Purlins | Vibration Noise / Roof Sagging |
Building Envelope Expertise: We don't just "cut a hole"; we ensure the structural and thermal integrity of your roof is preserved.
Mechanical Restoration Path: If your existing curbs are rotting, we are experts in Mechanical Fan Overhauls, offering custom-fabricated replacement curbs in aluminum or G.I.
VFD-Energy ROI Projection: We calculate the TNB savings achieved by "Smoothing" the air-path during our installation process.
2026 KL Weather-Proofing: We use the latest UV-stable materials designed for the high acidity of urban Malaysian rain.
Malaysia
