Case Study:
Restoring Breathability and Tackling Rising Damp
in Midhurst
A property in Midhurst was suffering from persistent rising damp, with visible damage to the internal walls. The root cause was traced to moisture trapped by non-breathable materials, such as modern gypsum or cement-based plasters, previously applied to the walls.
These products, while common in recent decades, are unsuited to older buildings and those with solid walls, because they prevent moisture from naturally evaporating, leading to damp buildup and associated problems.
Assessment and Diagnosis
Upon inspection, it was clear that the existing wall coverings were exacerbating the damp issue. Non-breathable plasters had sealed in moisture, preventing the walls from drying out. This resulted in damaged plaster, salt deposits, and a musty odour, classic symptoms of rising damp.
The solution required not just treating the symptoms but addressing the underlying cause by restoring the wall’s ability to breathe.
The Remedial Process
1. Careful Removal of Damaged Plaster
Gavin began by removing all damp-affected plaster back to the bare brickwork, ensuring that any salts and contaminants were also cleared away. This is a crucial first step, as retaining contaminated or non-breathable materials would only perpetuate the problem.
2. Application of Hi-Lime Renovation Backing Plaster
With the walls exposed and cleaned, Gavin applied a hi-lime renovation backing plaster. Lime-based plasters are highly breathable and ideal for older properties, as they allow moisture to evaporate naturally through the wall surface. This helps prevent future damp buildup and protects the underlying structure.
3. Finishing with Lime Plaster
A lime finish plaster was then applied over the backing coat. This finishing layer is not only breathable but also resistant to mould and efflorescence, thanks to its natural lime composition. The result is a smooth, attractive surface that supports the wall’s natural drying process and is sympathetic to the building’s heritage.
Why Breathable Plaster Matters
Modern, non-breathable materials like cement and gypsum trap moisture within the wall, causing long-term damage and requiring frequent repairs. In contrast, lime-based renovation plasters are specifically designed for damp-affected and heritage walls. They:
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Allow moisture to evaporate, reducing the risk of future damp problems
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Prevent mould and salt damage
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Offer a durable, crack-resistant finish
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Are trusted by conservation professionals for sensitive restoration projects
Outcome
The property’s walls were restored to their original breathable state, allowing trapped moisture to escape and preventing future damp issues. The use of hi-lime renovation backing plaster and lime finish plaster provided a robust solution that will protect the property for years to come.
At G Jones Plastering & Damp Proofing, we specialise in diagnosing and resolving rising damp using proven, conservation-friendly methods.
Gavin, with over 25 years of experience and PCA qualifications, ensures that every project, like this one in Midhurst, is completed with care and expertise. If you’re experiencing damp issues or need advice on breathable plaster solutions for your property, contact us today to arrange a survey, and see how we can help restore your home’s health and value.