Engineered multi-layer moisture barrier contracting for flat concrete roofs, parapet walls, wet areas, basements, and water retaining structures across Kenya.
Structural waterproofing protects reinforced concrete, masonry, and foundation elements from the destructive effects of liquid water penetration and moisture migration. We provide comprehensive contracting services for flat concrete roofs, rooftop terraces, parapet wall coping, internal wet areas, basement retaining walls, and water reservoirs across Kenya. Our approach combines forensic moisture diagnostics with multi-coat liquid elastomeric membranes, polymer-modified cementitious slurries, and reinforced mesh systems engineered to withstand tropical rainfall and thermal movement.
Waterproofing is an engineering discipline, not a decorative cosmetic repair. Applying a coating over a damp patch or water stain without discovering how water entered the building guarantees failure. Moisture can enter through hairline thermal cracks in a concrete slab, leaking plumbing pipes embedded in walls, failed parapet wall expansion joints, blocked roof rainwater outlets, or capillary rising damp from uninsulated ground foundations. Before specifying any waterproofing system, our technical supervisors inspect the building envelope to identify the exact point of ingress.
Building owners and facility managers should look out for these recognizable indicators of waterproofing failure:
Different building areas require fundamentally different waterproofing chemistry and application techniques:
A waterproofing membrane is only as good as the substrate beneath it. Before application, the concrete surface must be swept clean of dust, moss, and loose screed. Honeycombed concrete is chipped away and patched with polymer repair mortar. Crucially, sharp 90-degree internal corners between the horizontal roof deck and vertical parapet walls are rounded off by installing a 50mm sand-cement angle fillet (coving). Waterproofing membranes stretched over sharp right angles easily tear under building movement.
Waterproofing estimates are formulated based on technical site variables:
To prove that a flat roof waterproofing installation is completely watertight before handover, we conduct a controlled flood ponding test where structural design permits. Rainwater drainage outlets are temporarily plugged, and clean water is ponded across the roof deck to a depth of 50mm for 24 to 48 hours. The ceiling below is inspected continuously for any signs of dampness. Once verified, drains are unplugged, and the roof is allowed to dry.
We trace leak paths, check slab falls, test concrete moisture levels, and identify expansion joints and penetration details.
⏱ Estimated Interval: Half day
Loose material is scraped off, cracks are chased and sealed, and 50mm angle fillets are installed along all vertical parapet junctions.
⏱ Estimated Interval: 1 to 2 days
Application of primer followed by basecoat, embedded non-woven polyester geotextile mesh across all planes, and multiple saturating topcoats.
⏱ Estimated Interval: 2 to 3 days
Temporary sealing of drains and 24 to 48 hour water ponding test to verify complete watertightness before issuing warranty documentation.
⏱ Estimated Interval: 24 to 48 hours
This contracting specification is engineered for compliance with standards in the following facility sectors across Kenya:
Technical method statements and substrate specifications executed under this contracting division.
Elastomeric liquid-applied waterproofing membranes and polyurethane systems engineered for concrete flat roofs, terraces, and gutters in Kenya.
Potable water certified solvent-free epoxy linings and chemical-resistant polyurethane systems for underground concrete water reservoirs, sewage treatment sumps, and chemical containment.
Chemical damp proof course (DPC) silane injection, salt-resistant anti-efflorescence primers, and breathable polymer skim coats to permanently cure wet walls and peeling paint.
Manufacturer-approved paints, primers, epoxy screeds, and membranes installed by our crews.
Euroclass A1 non-combustible exterior thermal and acoustic insulation composite system engineered with mineral wool slabs and breathable finishes for high-rise commercial towers and institutions across Kenya.
Pioneering German-engineered External Thermal Insulation Composite System (ETICS) utilizing high-density EPS insulation boards to slash building heating and cooling energy while sealing building envelopes against water ingress.
Associated contracting scopes frequently combined with this service on Kenyan projects.
High-build acrylic roof membranes, rust conversion, solar heat reflectance, and leak prevention for corrugated metal and tile roofs across Kenya.
Heavy-duty mechanical diamond grinding, paint stripping, floor tile glue removal, crack chase injection, and masonry skimming to ensure sound substrate bonding across Kenya.
Weatherproof exterior facade painting, elastomeric barrier coatings, boundary perimeter walls, and solar UV protection for residential buildings across Kenya.
Water flows along the path of least resistance. A damp ceiling in one room may be caused by a hairline crack or failed joint on a flat roof 10 meters away. If you merely coat the ceiling inside, trapped water will accumulate, rot the plaster, and find another exit point. Waterproofing must always be applied on the side where water enters (positive side) to protect the structure.
Paint is a thin decorative coating, not a waterproofing barrier. Trapped water inside plaster creates vapor pressure that forces standard paint to blister, flake, and powder. Furthermore, damp plaster contains soluble salts that crystallize on the surface (efflorescence), destroying paint adhesion within weeks. The water source must be stopped and the plaster dried before any painting is done.
Key warning signs include brown or dark water staining on ceilings below the slab, crumbling or bubbling plaster on parapet walls, white salt deposits blooming along exterior walls, persistent standing water that does not drain after rain, and visible cracking at the junction between the flat slab and the vertical parapet wall.
The slab must be thoroughly cleared of dirt, loose debris, moss, and failing old coatings. Any structural cracks must be routed open and sealed with polyurethane sealant. Most importantly, a 50mm curved sand-cement fillet (coving) must be installed at all 90-degree wall-to-floor junctions so the waterproofing membrane does not split at sharp corners.
Cementitious waterproofing is a rigid or semi-flexible polymer-modified slurry that bonds directly to damp concrete, making it ideal for internal bathrooms, water tanks, and under-tile applications. Elastomeric acrylic membranes are highly flexible liquid coatings that stretch over 300 percent, bridging thermal cracks on exposed exterior roofs subject to hot sun and seasonal temperature swings.
In many cases, yes. If the existing screed or ceramic tiles are sound, hollow-free, and well-bonded to the concrete slab, specialized clear polyurethane or fiber-reinforced liquid membranes can be applied directly over properly prepared, primed tiles and cleaned grout joints. However, if tiles are loose or water is trapped underneath, the loose section must be removed.
A flood test involves temporarily plugging all roof rainwater drainage outlets and filling the roof slab with 50mm of clean water for 24 to 48 hours. We inspect the soffit and ceilings below continuously to verify that zero water penetrates before we sign off on the job. It should only be conducted where the building structure can safely bear the temporary water weight.
Cost is influenced by the total area to be waterproofed, the height and accessibility of the building, whether old failing membranes (such as burnt bitumen felt) must be stripped off, the number of parapet wall linear meters and pipe penetrations to detail, and whether the slab requires re-screeding to fix drainage slopes.
We inspect the site, calibrate concrete moisture levels with digital impedance meters, evaluate substrate soundness, and write an exact bill of quantities before quotation.
