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Performance of a lime-based insulating render for heritage buildings

Tijdschriftbijdrage - Tijdschriftartikel

Insulating heritage buildings in order to provide a comfortable indoor climate, to reduce energy consumption and avoid thermal stresses into the structure, is generally not in accordance with architectural preservation guidelines. Without compromising historic features, insulation renders may however upgrade rendered heritage of which the original materiality is considered inferior compared to its design. This study evaluates the hygrothermal performance of 49 insulating lime-perlite render configurations on brick masonry, by combining characterisation experiments with numerical modelling. The effects of the coupled heat-moisture transport are finally validated by ageing cycles and bond strength tests. It is found that insulating renders cause smaller shifts in temperature in the structure compared to historic renders, but the moisture level of the support may increase significantly. In addition, the insulation layers store a lot of moisture during winter, affecting the expected insulation capacity.

Tijdschrift: Construction and Building Materials
ISSN: 0950-0618
Volume: 159
Pagina's: 376-389
Aantal pagina's: 14
Jaar van publicatie:2018
Trefwoorden:THERMAL PERFORMANCE, HISTORIC BUILDINGS, HYGRIC PROPERTIES, MORTARS, PLASTERS, PARAMETERS, EXTERIOR, Stone imitation, Hygrothermal modelling, Material characterisation, Insulating render, Ageing cycles, Materiaalkunde, Algemene en klassieke ingenieurswetenschappen