Charming sash windows. Deep stone walls. That unmistakable character you only find in older homes. In Carndonagh, period properties are part of the landscape—but beneath their beauty lies a hidden risk: mould.
At Causeway Cleaning Ltd, we’ve inspected and treated dozens of older homes in the Carndonagh area. And time after time, we find the same story: hidden damp, poor insulation, and silent mould growth threatening the health of both the building—and the people living inside it.
This blog explores why Carndonagh’s heritage homes are especially vulnerable to mould, and what you can do to preserve your property and protect your health.
Many of Carndonagh’s traditional cottages and townhouses were built with solid stone or solid brick walls, without the cavity insulation or modern membranes found in newer builds. While these materials breathe naturally, they’re also very absorbent.
Once water gets in—from driving rain, rising damp, or condensation—it stays in.
The Society for the Protection of Ancient Buildings (SPAB) warns that adding modern, impermeable materials to old walls (like concrete render or plastic paints) can trap moisture, leading to mould growth beneath the surface.
In older homes with poor or inconsistent insulation, interior surfaces—especially on external walls—tend to stay colder. This is a recipe for condensation.
When warm indoor air meets a cold wall, moisture forms—and if that wall lacks ventilation or has furniture placed in front of it, the area becomes a prime location for mould.
We regularly find black mould in corners, under stairs, and behind wardrobes in Carndonagh homes with older construction.
During our surveys, we often see:
In one stone-built property just outside town, we found Stachybotrys chartarum (toxic black mould) growing behind a kitchen unit. The cause? A blocked gutter, driving water down the wall—and solid masonry that had soaked it up like a sponge.
A major issue with older buildings is that mould often remains hidden—inside voids, under floorboards, or behind decades-old plaster. That’s where our DNA-based testing and moisture diagnostics come in.
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Using surface swabs, air sampling, and thermal imaging, we can detect:
This allows us to treat it at the source, not just paint over the problem.
Let’s face it—Carndonagh gets soaked.
With around 1,200mm of annual rainfall and consistent Atlantic winds, Donegal homes face some of Ireland’s harshest weather conditions. This leads to:
Met Éireann data confirms that Donegal experiences some of the highest year-round humidity in the country—making moisture management even more critical.
Don’t trap moisture with plastic-based paints, cement render, or vinyl wallpaper. Use lime plaster, breathable insulation, and mineral paints that allow moisture to escape.
Allow air to flow behind furniture—especially on north-facing or external walls.
Consider passive air vents or mechanical systems if you notice persistent condensation or smells.
Keep relative humidity below 60%. A small digital hygrometer can help you monitor the environment—especially during winter.
If you’ve noticed a musty smell, dark patches, or persistent damp—even without visual signs—book a professional survey.
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We specialise in mould removal and prevention in older properties. Our team is:
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Don’t let mould rob your beautiful Carndonagh home of its charm—or your family of its health.
With the right knowledge, materials, and expert help, older homes can be just as healthy and mould-free as new builds. Let Causeway Cleaning Ltd help you protect what matters most.
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