Frequently Asked Questions

Salt damp itself isn’t toxic — but the conditions it creates can impact your health.

When salt contamination draws moisture into walls, it creates a damp environment that encourages mould growth, musty odours, and airborne spores. These can aggravate asthma, allergies, and other respiratory conditions, particularly in children and older adults.
Damp walls can also trap moisture indoors, increasing humidity levels throughout the home.

If you’re noticing mould patches, flaking paint, bubbling plaster, or a persistent damp smell, it’s worth investigating the underlying cause rather than just treating surface mould.
Addressing salt damp properly improves both your property and your indoor air quality.

No — although it’s more common in older properties, it can affect homes of any age.

Salt damp is typically caused by ground moisture carrying mineral salts into masonry. While older homes may lack modern damp-proof courses, newer homes can still experience issues due to:
• Bridged or failed damp-proof courses
• Poor drainage
• Landscaping built above DPC level
• Subfloor ventilation problems
• Renovations that trap moisture in walls
Age alone doesn’t determine risk. Construction type, site conditions, and past alterations are often more important factors.
If you’re unsure, a proper inspection is the only way to confirm.

They’re often confused — and sometimes used interchangeably — but they’re not always the same thing.

Rising damp refers to moisture travelling upward from the ground through masonry.

Salt damp refers to the salt contamination left behind when that moisture evaporates. Even if moisture levels reduce later, the salts remain in the wall and continue attracting moisture from the air.

Common signs of salt contamination include:
• Flaking or powdery plaster
• Paint bubbling or peeling
• White, crusty salt deposits
• Damage confined to lower wall areas

Accurate diagnosis matters because treatment differs. Simply repainting or patching plaster won’t solve the problem if salts are still present inside the wall.
A professional moisture and salt analysis can determine the real cause and the correct solution.