Terrace PU Waterproofing

Project Overview & Site Background

In the leafy suburb of Banana, Nairobi, a homeowner faced a recurring nightmare: water seeping through the terrace ceiling of their master bedroom every time it rained. The terrace, a 150sqm expanse of concrete screed, had been patched multiple times over the years, but the leaks persisted. Frustrated by the failed repairs and worried about the structural damage, the homeowner reached out to Phemat Solutions Ltd, a trusted name in terrace waterproofing Nairobi.

Our team arrived to find a terrace that had clearly suffered from years of neglect and inadequate waterproofing. The original bituminous coating had deteriorated, leaving cracks and blisters that allowed water to penetrate the concrete slab. The result was not only unsightly water stains but also a growing risk of structural decay. The homeowner needed a permanent solution, not another temporary patch.

Initial Structural Diagnostics

Our engineers began with a thorough inspection using digital moisture scanners to map the extent of water ingress. The scans revealed high moisture levels across the entire terrace, with saturation exceeding 90% in several areas. The existing waterproofing membrane had failed completely, and the underlying screed was cracked and delaminating in places.

We also identified that the drainage outlets were poorly sealed, allowing water to pool and seep through the joints. The terrace had no proper falls, exacerbating the problem. It was clear that a comprehensive solution was required, one that would address both the surface and the underlying structural issues.

Critical Site Challenges

The project was not without its challenges. The terrace was directly above the main living areas, meaning any disruption had to be carefully managed. The homeowner was keen to avoid any further damage to the interior, so we had to work efficiently and cleanly.

Additionally, the rainy season was approaching, adding urgency to the project. We had to complete the waterproofing within a tight window to ensure the terrace was protected before the next downpour. The weather in Nairobi can be unpredictable, and we had to plan our work around the forecast to avoid applying materials in wet conditions.

Engineered Technical Solution

Given the condition of the terrace, we recommended a liquid PU membrane waterproofing system, known for its durability and flexibility. This system is ideal for flat roofs and terraces in Kenya, where temperature fluctuations and UV exposure can take a toll on traditional materials.

Our process began with surface preparation. We power-ground the entire terrace to remove the old, failed coating and any loose debris. The surface was then cleaned and repaired, filling cracks and leveling out low spots to ensure proper drainage. After allowing the surface to dry completely, we applied a primer to enhance adhesion.

Once the primer had cured, we applied the first coat of YHPUroof Waterproofing, a high-performance liquid PU membrane. This was followed by a second coat, applied perpendicular to the first to ensure even coverage. The membrane was reinforced at all joints and corners with a fiberglass mesh to add extra strength.

Finally, we applied a protective topcoat of 450Ep Coatings, a UV-resistant epoxy coating that not only protects the PU membrane from degradation but also provides a clean, finished appearance. The entire system was left to cure for 48 hours before testing.

“Our commitment to quality means we never cut corners. Every project, from a small residential terrace to a large commercial roof, receives the same rigorous attention to detail and the same 10-year warranty.”

Quality Verification & 72-Hour Flood Testing

To verify the integrity of the new waterproofing system, we conducted a 72-hour flood test. The terrace was flooded with water to a depth of about 50mm, and we monitored the area below for any signs of leakage. After three days of continuous flooding, there were no leaks, confirming that the system was watertight.

We also performed a final moisture scan, which showed that the concrete slab had dried out significantly, with moisture levels now within acceptable limits. The homeowner was invited to inspect the work and was impressed by the clean, professional finish.

Final Results & Client Impact

The project was completed in just 5 days, well within the expected timeframe. The homeowner now enjoys a fully waterproofed terrace that can withstand the heavy rains of Nairobi. The liquid PU membrane provides a seamless, flexible barrier that will not crack or peel, and the epoxy topcoat ensures long-lasting protection against UV rays.

“We are thrilled with the outcome,” said the homeowner. “The leaks have stopped completely, and the terrace looks brand new. Phemat Solutions proved to be true professionals, and we have peace of mind knowing our home is protected.”

This project is a testament to the effectiveness of PU waterproofing Kenya and the expertise of waterproofing contractors Nairobi like Phemat Solutions. If you are facing similar issues with your terrace or flat roof, do not hesitate to contact us for a free inspection and quote. Our terrace waterproofing cost Kenya is competitive, and we offer a 10-year warranty on all our work.