INSULATION
Preserving character with plaster
Neil Turner at Ecological Building Systems explores how natural thermal plaster products can achieve modern thermal performance requirements without compromising on the original architecture of traditional buildings.
materials that not only enhance thermal performance but are also sympathetic to the building’s authentic character and architectural features. Thermal plasters are made from a combination of cork, lime and natural materials which creates a capillary active layer that can signifi cantly improve the thermal performance of traditional solid walls.
W BREATHABILITY
One of the main advantages of using thermal plaster is its hygrothermal properties. Hygrothermal performance describes a material’s ability to manage moisture and temperature. Natural thermal plasters can absorb and release moisture without compromising the integrity of the building. This breathability is essential in older properties, where trapped moisture can lead to structural damage and health issues due to mould growth. By using a moisture resistant and breathable thermal plaster, it can ensure that properties retain good levels of indoor air quality.
When applied internally, breathable
thermal plasters can help create warmer and more comfortable living spaces while managing humidity levels. Externally, they act as an insulating layer that protects the building from temperature fl uctuations throughout the year, therefore maximising comfort for occupants.
PRESERVING ARCHITECTURAL CHARACTER One of the primary concerns when renovating older properties is improving energy performance without compromising architectural character. Natural thermal plaster offers an
approach that is compatible with historic
hen it comes to renovating older properties, the challenge often lies in selecting
Thermal plasters are often produced from renewable materials, which makes them a more sustainable choice
fabric and can be applied in a way that retains the original features of a building. For example, they can be shaped to follow the contours of stonework or curved walls, ensuring that the aesthetic integrity of the property is preserved. There are many examples of renovated buildings that have successfully used thermal plaster to enhance both performance and appearance. In the renovation of a Grade II farmhouse in the Lake District, Diasen Diathonite Thermactive.037, a lime and cork- based insulating plaster, was applied
to help improve thermal effi ciency while maintaining the building’s historic character. Because the material is capillary-active and highly vapour-open, it is well-suited for use in older solid- wall buildings. The plaster helps walls to regulate moisture and dry naturally, reducing the risk of condensation and mould while providing very good thermal performance. Thermal plaster is known for taking an extended time period to dry. However some of the latest modern lime and cork plasters have been designed with high
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