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Hygrothermal modelling of the differences between single versus variable relative humidity vapour diffusion resistivity properties of pliable membranes


Olaoye, TS and Dewsbury, M and Wallis, L and Kuenzel, H, Hygrothermal modelling of the differences between single versus variable relative humidity vapour diffusion resistivity properties of pliable membranes, CivilEng pp. 687-716. ISSN 2673-4109 (2022) [Refereed Article]

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2022 by the authors. Licensee MDPI, Basel, Switzerland. Licensed under Creative Commons Attribution 4.0International license (CC BY).

DOI: doi:10.3390/civileng3030040


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

Item Details

Item Type:Refereed Article
Keywords:condensation, mould, indoor air quality, energy effciency, air tightness
Research Division:Built Environment and Design
Research Group:Architecture
Research Field:Architectural science and technology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in built environment and design
UTAS Author:Olaoye, TS (Mr Toba Olaoye)
UTAS Author:Dewsbury, M (Dr Mark Dewsbury)
UTAS Author:Wallis, L (Dr Louise Wallis)
ID Code:152139
Year Published:2022
Deposited By:Architecture and Design
Deposited On:2022-08-12
Last Modified:2022-09-08
Downloads:3 View Download Statistics

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