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Hygrothermal performance of exterior walls covered with aerogel-based insulating rendering

Abstract : In this study, we present a recently patented insulating rendering based on silica-aerogels. It is mainly developed for exterior thermal insulation applications. In addition to new buildings, it can be used for retrofitting existing ones since it has a high insulation performance and its application is easy, compatible with the traditional masonry facades, and using the well-known ordinary techniques. The objectives are to examine the hygrothermal performance of walls with this rendering and to compare different thermal insulation configurations. The methodology followed is developing a numerical model, then conducting an experimental set-up on a test-cell having the rendering on its south wall to validate the numerical model under real weather conditions. Different exterior wall structures are examined: no insulation, exterior insulation using this rendering, interior insulation, and interior and exterior insulation. Six assessment criteria are used: assembly water content, drying rate, mold growth, condensation risk, ASHRAE-160 criterion, and heat losses. Results show that interior thermal insulation systems can cause several moisture problems: inability to dry out over the years, condensation risk, etc. Adding the aerogel-based rendering on the exterior surface of the un-insulated or the already internally insulated walls reduces significantly or even removes the moisture risks. Also, it reduces significantly the wall heat losses.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01076592
Contributor : Magalie Prudon <>
Submitted on : Wednesday, October 22, 2014 - 4:03:59 PM
Last modification on : Friday, November 6, 2020 - 3:35:12 AM

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Mohamad Ibrahim, Etienne Wurtz, Pascal Henry Biwole. Hygrothermal performance of exterior walls covered with aerogel-based insulating rendering. Energy and Buildings, Elsevier, 2014, 84, pp.241-251. ⟨10.1016/j.enbuild.2014.07.039⟩. ⟨hal-01076592⟩

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