Damp Walls and Rising Damp in Kenya (2026): Causes and Lasting Fixes

Damp walls show up as peeling paint, white salt marks, black mould and a musty smell. Painting over them never lasts; you have to stop the water first. This guide helps you find the cause and fix it.

Which Type of Damp Do You Have?

How to Fix Rising Damp

1. Remove damaged plaster up to about 1 m.
2. Lower the outside ground so it sits below the floor level, and slope it away from the wall.
3. Add or repair the damp-proof course; for new floors lay a DPM under the slab.
4. Re-plaster with a waterproof cement mix and let it dry fully.
5. Repaint with breathable paint.

Materials and Prices

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More: DPM and polythene prices and paint prices.

Prevent Damp in New Houses

• Lay a DPM under the floor slab and a damp-proof course in the walls.
• Fit gutters and downpipes that discharge away from the house (gutters).
• Keep finished ground at least 150 mm below the floor.
• Plan windows for cross-ventilation.

Worked Example: Peeling Paint in a Ground-Floor Bedroom

A ground-floor bedroom has white salt marks and peeling paint up to about 80 cm on an outside wall, and the soil outside slopes towards the house. The patch is worse after rain, but the roof and pipes are dry. That pattern points to rising damp plus poor drainage. The fix: dig the soil back to 150 mm below floor level and slope it away; add a gravel strip; hack off the salty plaster; re-plaster with a waterproof mix; and let the wall dry fully before repainting with breathable paint.

Quick Test: Condensation or Rising Damp?

Tape a small square of foil or polythene tightly to the wall for 48 hours. Moisture on the room side of the foil means condensation (improve ventilation). Moisture on the wall side means water coming through the wall (rising damp or a leak).

Common Mistakes to Avoid

• Painting over damp walls.
• Using non-breathable paint on wet plaster.
• Ignoring a slow plumbing leak.
• Piling soil or flower beds against the wall.

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Frequently Asked Questions

What causes damp walls in Kenya?

Rising damp from the ground, leaks from roofs, gutters or pipes, and condensation from poor ventilation.

How do I stop rising damp?

Fix the damp-proof course, lower outside ground, re-plaster with waterproof cement and let it dry before painting.

Does waterproof paint stop rising damp?

Not on its own; the source of water must be stopped first.

Why is paint peeling off my wall?

Usually moisture behind the paint; find and fix the damp first.

What is DPM?

A damp-proof membrane, usually polythene, laid under floors to block ground moisture.

How long should plaster dry before painting?

Until fully dry, often several weeks for thick plaster.

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Related Guides

• DPM and Polythene Price
• How to Fix a Leaking Roof
• Cost of Painting a House