Terrace PU Waterproofing System Project

Project Overview & Site Background

In early 2026, a homeowner in Baringo County - Tolmo faced a recurring nightmare: water seepage through the terrace slab during the region's intense rainstorms. The terrace, which served as a vital outdoor living space, had suffered from multiple failed repair attempts using conventional bituminous coatings. Each rainy season brought fresh stains on the ceiling below, peeling paint, and a growing concern about structural damage. Seeking a permanent solution, the homeowner reached out to Phemat Solutions Ltd, a trusted name among waterproofing companies in Kenya, to conduct a thorough assessment and implement a reliable terrace waterproofing Kenya solution.

The property, a modern two-storey residence, featured a 186 sqm exposed concrete terrace that was integral to the home's design. The client's primary requirement was a seamless, long-lasting membrane that could withstand the harsh equatorial sun and heavy downpours typical of Baringo County. After an initial consultation, our team scheduled a detailed site inspection to diagnose the root causes of the persistent leaks.

Initial Structural Diagnostics

Upon arrival, Phemat's certified inspectors used digital moisture meters and thermal imaging to map the extent of water ingress. The results were revealing: moisture readings exceeded 90% in several zones, indicating severe saturation of the concrete substrate. The existing bitumen sheets had become brittle, with visible cracks and lifted edges at joints and around drain outlets. The screed had developed hairline fractures, allowing water to travel laterally beneath the surface and emerge far from the original source. Our diagnostic report highlighted that the terrace had no proper falls, leading to ponding in low spots, which accelerated the deterioration of the old membrane.

The diagnosis confirmed that a simple patch repair would be futile. The homeowner needed a complete removal of the failed system and the application of a modern, elastic PU liquid membrane waterproofing system that could bridge cracks and accommodate thermal movements. This approach aligns with the best practices for flat roof repair Kenya projects, where long-term performance is non-negotiable.

Critical Site Challenges

Executing the project presented several challenges. The first was the unpredictable weather; Baringo County can experience sudden, intense thunderstorms, which threatened to disrupt the application of the PU membrane. We scheduled the works during a dry spell forecast, but we remained vigilant, ready to protect the prepared surfaces with temporary covers if needed. Secondly, the terrace was directly above the main living area, meaning any water ingress during the works could cause significant damage to the interior finishes. We implemented strict containment measures, including the use of temporary drainage channels and moisture barriers, to safeguard the rooms below.

Another challenge was the condition of the substrate. The concrete surface was uneven, with spalled areas and remnants of the old adhesive. Achieving a clean, sound substrate was essential for the success of the polyurethane waterproofing Kenya system. Our crew had to perform extensive surface preparation, including power grinding and pressure washing, to ensure optimal adhesion. Finally, the logistics of working in a remote location required careful planning to ensure all materials and equipment were on site before commencement, avoiding any delays.

Engineered Technical Solution

Phemat Solutions Ltd proposed a comprehensive solution using a two-component system: Primer SN and YHPUroof Waterproofing-8190, a high-performance, UV-stable polyurethane membrane. This combination is renowned for its exceptional elasticity, durability, and resistance to ponding water, making it ideal for terraces in Kenya's climate.

The application process was executed in meticulous stages over the 5-day programme:

• Day 1: Surface Preparation - The old bitumen membrane and loose screed were completely removed using diamond grinders. The entire 186 sqm area was then pressure washed and allowed to dry thoroughly. Any cracks and voids were repaired with a cementitious filler to create a smooth, monolithic surface.
• Day 2: Priming - A uniform coat of Primer SN was applied to the prepared concrete using rollers. This primer penetrates the substrate, sealing minor pores and providing a tacky base that enhances the adhesion of the PU membrane. The primer was left to cure for the recommended time, ensuring a dry, dust-free surface.
• Day 3: First Coat of PU Membrane - The YHPUroof Waterproofing-8190 was mixed according to the manufacturer's specifications and applied using a trowel and roller to achieve a consistent thickness of 1.5mm. Special attention was given to corners, edges, and around drain outlets, where a layer of reinforcing fabric was embedded to add strength.
• Day 4: Second Coat & Reinforcement - After the first coat had cured, a second coat of the PU membrane was applied to bring the total dry film thickness to 2.5mm. This dual-layer approach ensures pinhole-free coverage and superior resistance to mechanical damage. Additional reinforcement was applied at all critical junctions, including the parapet wall upstands.
• Day 5: Curing & Final Inspection - The membrane was left to cure fully, and then a comprehensive visual inspection was conducted. We also performed a water ponding test on a small section to verify the integrity of the membrane before the final handover.

This methodology is a hallmark of our roof waterproofing services Kenya, combining advanced materials with skilled workmanship to deliver a system that exceeds client expectations.

"Our commitment to using only the highest quality materials, such as the YHPUroof system, and our adherence to strict application standards ensure that every project we undertake is built to last. We stand behind our work with a comprehensive 10-year warranty, giving our clients total confidence in their investment."

Quality Verification & 72-Hour Flood Testing

To validate the effectiveness of the new PU waterproofing system Kenya, we conducted a rigorous 72-hour flood test. The terrace was dammed at all outlets and filled with water to a depth of approximately 50mm. This test simulates the worst-case scenario of prolonged heavy rainfall and standing water. Over the next three days, our team monitored the water levels and inspected the ceilings below for any signs of moisture ingress. The results were flawless: no leaks, no damp spots, and no drop in water level, confirming that the membrane was completely watertight.

Following the flood test, we used digital moisture meters to re-scan the substrate. The readings showed a dramatic reduction in moisture content, from over 90% to below 15%, indicating that the concrete was now dry and protected. This data provided the homeowner with tangible proof of the system's performance, reinforcing the value of choosing a professional terrace waterproofing contractor Kenya.

Final Results & Client Impact

The project was completed on schedule and within the agreed budget, with the homeowner expressing immense satisfaction with the outcome. The terrace is now fully protected against water ingress, and the interior ceilings are free from unsightly stains. The new PU membrane also provides a seamless, easy-to-clean surface that enhances the aesthetic appeal of the outdoor space.

By investing in a high-quality terrace waterproofing cost Kenya solution, the homeowner has avoided the recurring expenses of temporary repairs and protected the structural integrity of their home. The 10-year warranty offered by Phemat Solutions Ltd provides ongoing peace of mind, knowing that any potential issues will be addressed promptly and professionally.

This project in Baringo County - Tolmo is a testament to the effectiveness of modern PU membranes and the expertise of our team. For any homeowner or developer seeking reliable flat roof waterproofing Baringo County solutions, Phemat Solutions Ltd is the trusted partner. Contact us today for a comprehensive assessment and a tailored quote for your terrace or flat roof waterproofing needs.