Water damage is the number one cause of premature building deterioration in Ghana. Leaking roofs, rising damp, wet bathrooms and flooded compounds destroy plaster, timber, electrical systems and structural elements — silently and expensively. This guide tells you everything you need to know about waterproofing in Ghana.
🌧️ Ghana's two rainy seasons (April–June and September–November) expose every waterproofing weakness in a building. The time to fix waterproofing problems is before the rains — not during them.
Types of Waterproofing Used in Ghana
Bituminous Membrane Waterproofing
The most common system for flat roofs, concrete slabs and underground elements in Ghana. Torch-on bitumen membranes are heated and bonded to the substrate, forming a continuous waterproof layer. Highly durable when correctly applied — lifespan of 15–25 years with good application. Best for: flat roofs, roof gardens, basement slabs.
Liquid-Applied Waterproofing
Flexible, brush or roller-applied membranes that cure to form a seamless waterproof coating. Ideal for complex shapes, parapet walls, pipe penetrations and areas where membranes are difficult to apply. Best for: bathroom tanking, parapet walls, water tanks.
Crystalline Waterproofing
A cement-based product that penetrates concrete and forms crystals in the capillary pores, blocking water passage. Self-sealing — if the concrete cracks slightly, the crystals continue to grow and reseal. Best for: concrete elements, foundations, retaining walls.
Chemical Damp-Proof Course (DPC)
For existing buildings suffering from rising damp. A chemical solution is injected into the mortar bed at floor level, forming a horizontal barrier to rising moisture. Best for: rising damp treatment in existing walls.
Silicone and Hydrophobic Coatings
Clear or tinted coatings applied to external masonry surfaces. Repel water while allowing the wall to breathe. Best for: external render, brick and block facades, compound walls.
Where Waterproofing is Required in Ghana
- Flat roofs and roof slabs — any flat or low-pitch roof must be waterproofed. No exceptions.
- Bathrooms and wet rooms — the floor and lower walls must be tanked before tiling.
- Foundation and basement level — especially on plots with high water tables or poor drainage.
- External walls — in areas of heavy driving rain or where existing render is cracked.
- Water tanks — both potable and non-potable tanks require food-safe waterproof coatings.
- Compound walls — coping and top treatment to prevent water soaking down through the wall.
Waterproofing Costs in Ghana — 2026
Waterproofing Costs — Greater Accra (2026)
| Bathroom tanking (per bathroom) | GHS 1,500 – 3,500 |
| Flat roof waterproofing (per m²) | GHS 80 – 180 |
| Flat roof — 3-bedroom house (full) | GHS 8,000 – 22,000 |
| Rising damp treatment (per linear metre of wall) | GHS 400 – 900 |
| External wall silicone treatment (per m²) | GHS 25 – 55 |
| Water tank waterproofing (5,000L tank) | GHS 2,000 – 5,000 |
| Full building waterproofing assessment | Free (Cornerstone) |
How to Choose a Waterproofing Contractor in Ghana
- Ask what product they are using — a good contractor names the system and manufacturer, not just "waterproofing chemical."
- Ask about surface preparation — waterproofing fails on dirty, weak or cracked substrates. How they prepare the surface is as important as the product itself.
- Ask about the number of coats — most liquid systems require minimum 2 coats; skimping on coats is the most common shortcut.
- Demand a written warranty — any contractor confident in their work will warrant it. We provide a 6-month warranty on all waterproofing work.
- Get a fixed price — waterproofing scope should be agreed and priced before work starts.
Not sure what waterproofing your building needs?
We assess your building for free, identify every problem and give you a fixed-price treatment plan. No obligation.
Book a Free Assessment 💬 WhatsApp Kwaku