Performance of internal wall insulation systems - experimental test for the validation of a hygrothermal simulation tool
2014
In the UK, transient models of heat, air and moisture transport (HAMT) are common
tools used by building practitioners to better understand moisture movement within building elements
and construction systems. Enforced by BS 5250:2011, hygrothermal simulations are also used for
condensation risk analysis and to estimate the likelihood of mould growth and fabric decay. This
paper describes the methodology applied in the validation of a hygrothermal-modelling tool used in
the evaluation of internal wall insulation. Wall assemblies typically constructed for internal insulation
were exposed to transient boundary conditions derived from vapour pressure profiles and their
response to step changes and fluctuations were analysed. The wall assemblies were constructed using
one wall substrate (aerated clay blocks and gypsum plaster) and eight commonly used internal
insulation systems. Relative humidity and temperature levels measured at the interface between the
wall substrate and each insulation system were used to assess the hygrothermal performance of each
insulation system. As a result, the wall assemblies were clustered in three subgroups; dense capillaryactive
insulation, lightweight vapour-permeable insulation and synthetic vapour-closed insulation,
and the hygrothermal performance of the proposed clusters compared with the results provided by the
simulation tool. It was found that simulated assemblies have similar hygrothermal performance as
those monitored.
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