PAINTING & DECORATING THE AGE OLD PROBLEM BMJ investigates the long-term benefits of premium renovation plasters. I


n heritage property restorations, choosing the wrong renovation materials can often lead to challenges down the line. Luke Brooks, senior commercial manager of specialist packed products at Tarmac, says merchants should be advising customers to invest in premium renovation plasters. From ageing homes to churches, halls and estates, heritage properties were typically constructed and finished in a way that allowed walls to breathe – enabling moisture to move freely through the building fabric without the risk of damp.


This important feature is critical in restoration projects, but too many times it is compromised by the use of impermeable materials without the correct knowledge or application, which will only cause more damage through moisture- related deterioration.


“The science behind it is evident,” says Brooks. “Conventional gypsum plaster is hygroscopic, meaning that moisture from the atmosphere or substrate is absorbed and retained. While this is the most suitable material in modern properties with enhanced insulation properties, gypsum plaster will typically break down when exposed to moisture in older structures, leading to cracking and deterioration of the plaster over time.


“In contrast, modern lime plaster systems, are breathable, allowing moisture to be released. This is made possible thanks to the microporous structure, which enables controlled vapour diffusion and offers resistance to liquid water penetration. Aligning with the natural properties of traditional building materials, lime plaster offers a step forward in conservation technology, maintaining the moisture


in restoration projects can add value to any traditional property. The important thing is to make it clear in the property details, just as you would any other period feature, repair or protection measure.


equilibrium which is so important for historic fabric preservation.”


Innovative solutions like Limelite offer superior long-term performance and reduce the need for ongoing maintenance in heritage buildings because – put simply - it is fit for purpose. The range balances heritage preservation with modern performance, removing the issues of cracking and deterioration that often arise when gypsum plasters are used without consideration for moisture levels in the property.


Lime plaster is often thought to be difficult to apply, but modern versions are user-friendly and easy to handle, designed with various skill levels in mind. Tarmac’s Limelite, for example, is less than half the weight of sand and cement plaster, and can also be applied to both modern and traditional substrates, including masonry, block, stone and wooden lath.


Lime plasters take out moisture from the air when there is too much, and release it back when the air gets too dry, creating a healthier environment that allows the walls to breathe out moisture and reduce mould growth. Around 20% of England’s housing stock was built before 1919 and the use of lime plasters


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OB41’s new OB41 Biobased 8 In One Multi- Oil Spray is part of its technical aerosol range, providing a single solution for multiple needs, from dealing with stuck parts, corrosion, rust, to maintaining materials and mechanisms. It can work on a variety of surfaces andcan help loosen stuck parts, protect against corrosion and rust, clean rust, grease, dirt,


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residues, and displace moisture, and silence squeaking and creaking noises. Using biobased ingredients, OB41 Biobased 8 In One Multi-Oil Spray is made with 30% bioethanol and 20% biobased oil. The technical aerosol range comes packaged in an aerosol can and includes multi-use penetrating oil spray that provides


long-lasting protection against corrosion, to a foaming glass cleaner that effortlessly removes dirt and grime from windows and mirrors.


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www.buildersmerchantsjournal.net March 2025


“Additionally, it would be remiss not to highlight the benefits of lime plasters without adding some clarification of the term ‘heritage’ in this context,” explains Brooks. “Renovating plasters have long been labelled as a product destined for use in the oldest buildings, but while they are highly successful for period properties, many housing association properties could feasibly be labelled ‘heritage’ too, given their age and susceptibility to damp. “Damp remains a huge issue in social housing. It is one of the most common factors which can affect gypsum plaster, leaving it susceptible to the growth of black mould and salts. Widespread installation of double glazing may have improved heat retention and sound insulation across, but it can also diminish ventilation and increase humidity levels, highlighting the limitations of gypsum plaster.” Retrospective damp proof measures such as the installation of a Damp Proof Course are costly and time-consuming, with no guarantee of a successful income. Lime plasters offer a less disruptive, often cheaper, alternative solution. Brooks concludes: “Like so many decisions in the construction sector, the path to success comes down to correct material choice. With enhanced understanding of lime plasters and access to premium products, those involved in the restoration of heritage buildings, whatever their age, have the tools to deliver tangible benefits for occupiers and building owners.” BMJ


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