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Hygrothermal performance of wood-hemp insulation in timber frame wall panels with and without a vapour barrier

Latif, E and Ciupala, MA and Tucker, SS and Wijeyesekera, DC and Newport, DJ (2015) Hygrothermal performance of wood-hemp insulation in timber frame wall panels with and without a vapour barrier. Building and Environment, 92. pp. 122-134. ISSN 0360-1323

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Abstract

An in situ experiment on a full-scale timber frame test building was carried out to study the hygrothermal performance of wood-hemp composite insulation in timber frame wall panels with and without a vapour barrier. The heat transfer properties and the likelihood of mould growth and condensation in the panels were compared. Step changes in the internal relative humidity were performed to explore the effects of high, normal and low internal moisture loads on the wall panels. No significant difference in the average equivalent thermal transmittance (U-values) between the panels with and without a vapour barrier was observed. The average equivalent U-values of the panels were close to the U-values calculated from the manufacturers’ declared thermal conductivity values of the insulation. The likelihood of condensation was higher at the interface of the wood-hemp insulation and the oriented strand board (OSB) in the panel without a vapour barrier. In terms of the parametric assessment of the mould germination potential, the relative humidity, the temperature and the exposure conditions in the insulation-OSB interfaces of the panel without a vapour barrier were found to be more favourable to the germination of mould spores. Nonetheless, when the insulations were dismantled, no mould was visually detected.

Item Type: Article
Uncontrolled Keywords: 1201 Architecture, 1202 Building, 0502 Environmental Science And Management
Subjects: N Fine Arts > NA Architecture
T Technology > TH Building construction
Divisions: Liverpool School of Art and Design
Publisher: Elsevier
Related URLs:
Date Deposited: 02 Mar 2016 13:53
Last Modified: 01 May 2016 23:50
DOI or Identification number: 10.1016/j.buildenv.2015.04.025
URI: http://researchonline.ljmu.ac.uk/id/eprint/3039

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