Identify the surface and follow the current instructions for your exact products. Do not sand or strip uncertain old coatings. Read the safety guide before disturbing materials.
The wall is a system
Traditional solid walls can manage moisture differently from modern cavity construction. Stone, mortar, plaster, render and paint all influence how moisture moves and dries. Choosing a coating in isolation can leave the rest of the problem untouched.
A label saying breathable is not enough. The substrate, retained layers, liquid water exposure and vapour permeability all matter. A mineral finish over an incompatible film does not automatically restore a wall’s drying behaviour.
Limewash has a place, not every place
Traditional limewash can suit compatible porous mineral backgrounds. It is not a universal coating for sealed paint, timber or glossy modern surfaces. Its appearance and maintenance differ from ordinary emulsion, and the existing layers need assessment.
Lime products can be strongly alkaline. Protect eyes and skin, follow the safety data and prevent splashes. Application methods and curing conditions must follow the chosen system rather than a decorative effect video.
Be curious about what is already there
In St Andrews and nearby Fife villages, later repairs may sit beside original materials. Look for dense patches, trapped moisture, salts and changes in texture. These clues can be more important than the age of the property alone.
Check whether listed building consent or conservation requirements apply before changing finishes or removing historic material. Gentle investigation and a small trial are usually wiser than aggressive stripping.
Common mistakes
- Assuming all stone should be painted.
- Using a breathable topcoat to compensate for an impermeable retained layer.
- Removing historic finishes before checking their significance.
Get conservation aware advice for salt damage, friable stone, persistent damp, historic coatings and proposed changes to listed buildings.
Sources & further reading
Original general guidance from Aethos, informed by the resources below. These references cover relevant safety, materials or techniques, not a specification for your property. Product examples are not paid recommendations.
- SPAB: limewash (opens in a new tab)
Traditional finishes, suitable substrates and caring for older buildings.
- HSE: lead in construction (opens in a new tab)
Why disturbing older lead paint requires a planned, controlled approach.
- HSE: asbestos guidance (opens in a new tab)
Identifying potential asbestos risks before disturbing building materials.