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Specification guide

Waterproofing Your Ghana Building: A Practical Guide

Where water actually gets into a Ghanaian building, which surfaces need protecting before the rains, and how a protective coating system is specified to stop leaks at the source rather than chase them.

Water Is the Building’s Most Patient Enemy

Most building damage in Ghana traces back to water finding a way in and staying. A leak rarely announces itself where it enters — it travels along the slab, down the wall, and shows up as a damp patch, a peeling coat, or a stained ceiling metres from the actual failure. By the time it is visible, it has already been working on the structure for a season.

Coralex Painters has waterproofed roofs, terraces, wet rooms, and walls across Accra, Tema, Takoradi, Kumasi, and Lomé since 1984. This guide explains where water gets in, which surfaces to protect before the rains arrive, and why waterproofing is a specified system, not a tin of “waterproof paint.”

Where Water Gets In

Flat Roofs and Terraces

Flat and low-pitch roofs are the most common point of failure. Water pools, finds hairline cracks and movement joints, and drives down into the slab. These surfaces need a continuous, flexible, UV-stable membrane system that bridges movement rather than a rigid coat that cracks with the slab.

Wet Rooms — Bathrooms, Kitchens, Balconies

Showers, kitchens, and open balconies leak at the floor-to-wall junction and around drains. Tanking these areas before tiling — or remediating them when they fail — stops water reaching the structure behind the tile.

Walls and Rising Damp

Exterior walls take wind-driven rain; ground-floor walls can draw moisture up from the slab. Damp on a wall is not a paint problem and cannot be painted over — the moisture source must be addressed first, then the wall treated and recoated.

Basements and Below-Ground

Below-ground walls face constant water pressure and need a system specified for negative or positive-side waterproofing depending on access.

Why “Waterproof Paint” Is Not Waterproofing

A single decorative coat marketed as water-resistant is not a waterproofing system. Real waterproofing is specified to the surface, the water pressure, and the movement it has to accommodate:

  • Membrane type — liquid-applied, cementitious, or sheet, chosen for the surface and exposure.
  • Movement accommodation — flexible systems bridge the cracks a rigid coat would split along.
  • Detailing — upstands, drains, joints, and penetrations are where systems leak; they are detailed, not painted over.
  • Substrate preparation — the surface is cleaned, repaired, and primed so the system bonds.

A waterproofing system that ignores the detailing leaks at exactly the points the brochure photo never shows.

Time It Before the Rains

The honest scheduling advice: waterproof in the dry season, not during the first downpour after the leak appears. A surface has to be sound and dry for a membrane to bond, and that window closes once the rains set in. Surveying and treating roofs, terraces, and wet areas ahead of the season is the difference between a planned job and an emergency one.

Frequently Asked Questions

My ceiling is staining — is it the roof?

Possibly, but not necessarily where the stain appears. Water travels along the slab before it shows, so the entry point is often metres from the visible damp. A survey traces it to source rather than treating the symptom.

Can I just repaint over the damp patch?

No. Painting over active damp traps moisture and the new coat fails within weeks. The water source must be addressed and the wall allowed to dry before any recoating — otherwise you are paying to repaint the same patch repeatedly.

When is the best time to waterproof?

In the dry season, before the rains. A surface must be sound and dry for a membrane system to bond, and that becomes impossible once water is sitting on the roof. Planned dry-season work is always cheaper and more reliable than an emergency.

Is waterproofing a one-off or does it need maintenance?

A quality system lasts for years, but roofs and terraces should be inspected periodically — especially at drains, upstands, and joints where movement concentrates. Catching a small detail failure early prevents a slab-soaking one later.

Protect the Building Before the Rains

Coralex Painters surveys and waterproofs roofs, terraces, wet rooms, and walls across Greater Accra, Tema, Takoradi, Kumasi, and Lomé, Togo. For a free pre-season survey, call +233 23 063 0014.