INSULATION


performance by up to four times, and its elasticity, which is around 10 times greater than that of conventional plasters, helps to prevent cracking and supports the long-term durability of the restored building.


The plaster should be applied in layers 15-25mm thick. The total thickness needed will depend on the required U-value for the specifi c project but 40-60mm is typical for the most cost- effective thermal improvement. Thermal plasters like this are often specifi ed as part of a wider retrofi t strategy to help manage moisture while improving thermal performance. This allows the building to be upgraded to modern performance requirements while retaining vapour- open, compatible materials.


levels of breathability, which also speeds up drying times. Some thermal plasters dry at a rate of 2mm per day (this may vary depending on ambient temperature or weather conditions), whereas conventional lime plasters dry at around 1mm per day.


THERMAL PERFORMANCE A 50mm application of thermal plaster can enhance a wall’s thermal


SUSTAINABILITY Thermal plasters are often produced from renewable materials, which makes them a more sustainable choice compared to synthetic alternatives. As a result, they offer a reduced carbon footprint and typically require less energy to produce. They can also help improve indoor air quality, as many natural plasters are low in volatile organic compounds (VOCs), contributing to healthier living environments. Once


applied, thermal plaster also requires minimal maintenance.


FINAL THOUGHTS


Choosing natural thermal plaster for renovated properties is crucial for achieving optimal thermal performance without compromising the building’s character. Incorporating thermal plaster into


renovation projects offers a uniue opportunity to enhance energy effi ciency while preserving the beauty and integrity of traditional architecture. As older buildings are increasingly being renovated to enhance their energy effi ciency, innovative advanced types of thermal plaster will play a vital role in the future of sustainable buildings.


Neil Turner is UK technical manager at Ecological Building Systems


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