Hygrothermal Modelling of the Differences between Single versus Variable Relative Humidity Vapour Diffusion Resistivity Properties of Pliable Membranes

The study investigates through hygrothermal modelling the effect of different boundary conditions and varying measured vapour diffusion resistivity values on performance five pliable membranes. Previously, this research quantified variable water properties building membranes were assessed under humidity using gravimetric wet dry cup test method. better represent experienced by materials in envelope. include two permeable, impermeable, one products, which are commonly used to provide air control layers construction framed external wall systems. This article focusses transient each these as a component typical timber-framed, clay brick veneer system. simulations completed for three climate types, namely, hot humid, temperate, cool-temperate with snow, northern western orientation. results from bio-hygrothermal highlighted responses subject type These show that there significant differences simulated moisture mould growth risk between single resistance factor value multipoint values.