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Effects of Ageing and Moisture on Thermal Performance of ETICS Cladding

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Durability of Building Materials and Components

Part of the book series: Building Pathology and Rehabilitation ((BUILDING,volume 3))

Abstract

Herein we present the results of an experimental activity to assess the degradation evolution and the loss in hygrothermal performances of External Thermal Insulation Composite Systems with rendering (ETICS). We exposed to accelerated ageing a sample of ETICS (with vinyl resin added base coat and acrylic thick finishing coat onto expanded polystyrene) applied to a masonry wall. The sample was aged with a repetition of two macro-cycles consisting of 125 UV cycles, 125 summer thermal shock cycles, 50 winter thermal shock and freeze–thaw cycles. To assess the hygrothermal performances over time, we measured the thermal transmittance and the time shift when exposed to sinusoidal forcing, while degradation was surveyed with photographs at fixed positions. We note that, with ageing, the studied building component offered higher water absorption capability and, thus, the thermal resistance presented a decreasing trend, while an increasing trend was observed for heat capacity, and time shift. With regard to the evolution of degradation, we observed a very strong influence of the thermal shock and dilatation-contraction events, resulting in blistering and deformation of the top coat.

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Notes

  1. 1.

    Hourly weather data sets are dealt according to ISO 15924-4 [23], so as to select a reference year from a data set of at least 10 years (recommended), normally longer. The reference year is actually a collection of real calendar months, each of those is the best fit with a computed year representative of the most frequent conditions in the long term for that data set (not simply computed as an average). Then, an adjustment, by interpolation, is applied to the last eight hours of each month and the first eight hours of the following calendar month, to “join” the best real months composing the reference year. A reference year for dynamic energy simulation must include at least: dry bulb air temperature; direct normal solar irradiance and diffuse solar irradiance on a horizontal surface; relative humidity, absolute humidity, water vapour pressure, or dew-point temperature; and wind speed at a height of 10 m above the ground.

  2. 2.

    For highly insulated samples recent studies [43] showed that φ, and f a may not be the best parameters to be used in order to asses the comfort in buildings.

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Acknowledgments

We acknowledge the Italian Ministry of Research (MIUR) for the initial funding of the experimental programme, with the research contract “PRIN2003–2005: Methodologies for design and assessment of durability of building components in sustainable building processes: standard experimental evaluation and correction suitable for the utilisation in specified use conditions aimed to maintenance planning for buildings”. We also want to thank for their precious help the BSc and MSc students in Building Engineering: Filippo Caimi, Andrea Dalcò, Alberto Fumagalli, Ilde Ferrara, Andrea Ragozzino, Francesco Rotella, Mattia Sala, and Matteo Tansi. We wish to thank Dr. Ronnen Levinson and all the Heat Island Group of the Lawrence Berkeley National Laboratory (Berkeley, California, USA) for having granted access to Riccardo Paolini to their laboratories and instrumentation with which the measurements of the optical and radiative properties were performed. We thankfully acknowledge Dr. H.M. Künzel of IBP-Fraunhofer for providing us with the software WUFI, which was helpful to better read the results of the experiments and design further tests.

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Authors and Affiliations

  1. Architecture, Built Environment and Construction Engineeering Department, Politecnico di Milano, Via Ponzio 31, 20133, Milano, Italy

    Bruno Daniotti, Riccardo Paolini & Fulvio Re Cecconi

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  1. Bruno Daniotti
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  2. Riccardo Paolini
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  3. Fulvio Re Cecconi
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Correspondence to Bruno Daniotti .

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Editors and Affiliations

  1. Department of Civil Engineering, Faculty of Engineering of, Building Physics Laboratory, Rua Dr. Roberto Frias, s/n, Porto, 4200-465, Portugal

    Vasco Peixoto de de Freitas

  2. Universidade do Porto, Laboratorio de Fisica das, Faculdade de Engenharia, Rua Dr. Roberto Frias, Porto, 4200-465, Portugal

    J.M.P.Q. Delgado

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Daniotti, B., Paolini, R., Re Cecconi, F. (2013). Effects of Ageing and Moisture on Thermal Performance of ETICS Cladding. In: de Freitas, V., Delgado, J. (eds) Durability of Building Materials and Components. Building Pathology and Rehabilitation, vol 3. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37475-3_6

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  • DOI: https://doi.org/10.1007/978-3-642-37475-3_6

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