.Author(s): F. Collet, S. Prétot, V. Colson, C.R. Gamble, N. Reuge, C. Lanos
Paper category: Proceedings
Book title: 3rd International Conference on Bio-Based Building Materials ICBBM 2019
Editor(s): Mohammed Sonebi and Sofiane Amziane
e-ISBN: 978-2-35158-229-9
Publisher: RILEM Publications SARL
Publication year: 2019
Pages: 367 - 373
Total Pages: 7
Language : English

Abstract: The European ISOBIO project allowed to both develop new bio-based building insulation materials
and improve industrial products from the partners of the project. It leaded to several multi-layers
solutions to be used as typical wall for new building or for retrofitting. The hygrothermal behavior
of these walls is studied experimentally (two demonstrator buildings and one laboratory test-wall)
and numerically.
This study investigates the hygric characterization of the materials used to produce the core of the
new wall solution: compressed straw board (CSB), commercial oriented strand boards (OSB), soft
insulation panels (Biofib trio, CAVAC), rigid insulation panels developed within ISOBIO project
(CAVAC panel). This paper presents the methods and the results obtained on absolute and
apparent densities, total porosity, sorption isotherm, water vapor permeability at dry point and at
wet point, and moisture buffer value. The studied materials are highly to very highly porous (60 to
98 %). They are hygroscopic. Their water vapor resistance factor is low for Biofib insulation, high
for OSB and medium for CSB and CAVAC panels. It decreases between dry point and wet point
in link with the hygroscopicity of materials. Their MBV gives them moderate to good moisture
buffering ability (respectively for CSB and OSB, and for Biofib and CAVAC panel). The study
provides an entire set of results that widely characterize the hygric behavior of studied materials
and allow to compare them. It underlines very different behaviors, particularly under transient
conditions. These data are useful to be implemented in numerical models that simulate
hygrothermal behavior at wall scale

Online publication : 2019
Publication type : full_text
Public price (Euros) : 0.00

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