— Waterproofing
Waterproofing that starts with a diagnosis, not a guess.
From roofs and basements to tanks and wet areas, we trace water to its source before recommending a system — so the fix addresses the actual problem, not just where it happens to show.
— Why waterproofing fails
Most repeat leaks come from the wrong fix, not a bad product.
Water rarely shows up where it enters. A stain on a ceiling can trace back to a roof penetration, a cracked parapet, or a failed joint metres away — and a coating applied to the visible symptom will fail again within a season.
We start every job with a proper site survey: tracing the path of water through the structure, checking substrate condition, and identifying every contributing factor before recommending a system.
— Signs you need waterproofing
If any of this looks familiar, it's worth a site visit.
Damp patches or discolouration
Brownish staining on walls or ceilings, especially after rain.
Musty smell indoors
A persistent damp odour in basements, stores or lower floors.
Peeling paint or bubbling plaster
Finishes lifting away from the wall as moisture pushes through.
Visible mould or mildew
Dark spotting on walls, ceilings, grout lines or window reveals.
Pooling water on roofs or balconies
Water that doesn’t drain within a few hours of rain stopping.
Cracks in walls or foundations
Especially cracks that widen, or appear after heavy rain.
White mineral deposits (efflorescence)
A chalky residue on concrete or block walls.
Rising damp at wall bases
Discolouration or crumbling plaster near the floor line.
— Our waterproofing services
Coverage for every part of the building envelope.
Roof waterproofing
Flat, pitched and podium roofs — membrane systems built for standing water and UV exposure.
Basement & foundation
Below-grade tanking and drainage to keep water out where hydrostatic pressure is highest.
Bathrooms & wet areas
Full membrane tanking under tile in showers, bathrooms, kitchens and laundries.
Water tanks
Internal and external tank waterproofing for potable and non-potable storage.
Swimming pools
Waterproofing for new pool shells and remedial work on leaking existing pools.
Balconies & terraces
Trafficable membrane systems that handle movement, drainage falls and finishes.
Crack injection & repair
Resin and cementitious injection for active leaks through cracks and joints.
Damp-proofing & rising damp
Chemical and physical damp-proof courses for walls affected by rising damp.
Gutters & drainage
Surface water management so roofs and podiums shed water instead of holding it.
— Systems & materials
Matched to substrate, exposure and expected service life.
Bituminous membranes
Torch-applied and self-adhesive sheet membranes for roofs and large horizontal areas.
Liquid-applied membranes
Seamless, flexible coatings for complex details, upstands and penetrations.
Crystalline waterproofing
Penetrating systems for concrete tanks, basements and below-grade structures.
Resin & crack injection
Targeted repair for active leaks through cracks and construction joints.
Cementitious coatings
Rigid and flexible coatings for wet areas, tanks and internal wall treatment.
EPDM & sheet systems
Durable single-ply membranes for roofs with long-term UV exposure.
Damp-proof courses
Chemical injection and physical DPC systems for rising damp control.
Sealants & joint systems
Movement joint and sealant systems for balconies, terraces and facades.
— Our waterproofing process
Five stages, each one written down.
01 — Site survey
Moisture mapping and visual inspection to trace water to its actual source.
02 — Diagnosis
We identify the cause and select a system matched to substrate and exposure.
03 — Written quote
Materials, labour, timeline and any prep work, laid out before anything starts.
04 — Application
Substrate preparation, primer, membrane or coating applied to spec.
05 — Inspection & handover
Flood or ponding test where applicable, plus care notes for the finished area.
— Why choose Greysand for waterproofing
Built around getting it right the first time.
Waterproofing that fails is expensive twice over — once to apply, once to remove and redo.
Root-cause diagnosis
We trace the water path before quoting, not after the first attempt fails.
Manufacturer-approved systems
Products applied per manufacturer specification, not shortcuts on the mix.
Warranted workmanship
We stand behind the application, with support if something needs attention.
Post-application testing
Flood tests and inspections before we call a job finished.
— Recent waterproofing work
Proof it holds up on site.
Bituminous membrane
Enkang Apartment
Kilimani, Nairobi
Dual-film bituminous membranes across residential blocks and common areas.
Crystalline + injection
Kenzi Residences / Cove
Nairobi
Crystalline waterproofing, resin injection and wet-area membranes.
Shaft waterproofing
Losai
Ngara, Nairobi
Specialised shaft waterproofing across service, ventilation and lift shafts.
— Questions
Waterproofing, answered.
Start with a waterproofing site survey.
Tell us what’s happening and where — we’ll assess the source and follow up with a written scope.