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

Article


Latif, Eshrar, Ciupala, A., Tucker, Simon, Wijeyesekera, Devapriya Chitral and Newport, D. 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.
AuthorsLatif, Eshrar, Ciupala, A., Tucker, Simon, Wijeyesekera, Devapriya Chitral and Newport, D.
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.

JournalBuilding and Environment
Journal citation92, pp. 122-134
ISSN0360-1323
Year2015
PublisherElsevier
Accepted author manuscript
License
CC BY-NC-ND
Web address (URL)http://dx.doi.org/10.1016/j.buildenv.2015.04.025
Publication dates
Print01 May 2015
Publication process dates
Deposited08 May 2015
Accepted16 Apr 2015
Copyright information© 2015 Elsevier B.V.
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