Hygrothermal Performance of Timber External Walls Insulated with Natural and Industrial Materials
The test house with special timber structure was built by the department of rural building of Estonian University of Life Sciences. The hygrothermal properties of sawdust and cellulose, used as insulation materials in building envelope, were investigated in long term. The test was carried out during four winters. The wind and moisture-vapor barriers were not applied in the first testing period. In the second testing period the wall was covered inside with the moisture barrier and outside with the wind barrier and the layer of OSB plates. In wintertime the test house was heated with electric batteries to keep the indoors temperature stable. The aim of this research was to measure and determine the thermal transmittance of differently insulated wall sections. To fulfil the task the devices to measure relative moisture and temperature were placed in five different positions (in three depths inside the insulation) and indoors and outdoors. The heat flux plates were applied on the inner surface of the wall. Data were recorded with 10 min interval. The analysis of these test periods was carried out and presented in this paper.
KeywordsThermal insulation Thermal transmittance Hygrothermal performance Sawdust Cellulose insulation
The building of the test house was supported by Ministry of Education and Research as a part of the research “Assessment, analysis and modelling of environmental sustainability of buildings life cycle” (2008–2012).
This article was supported by the Estonian Center of Excellence in Zero Energy and Resource Efficient Smart Buildings and Districts, ZEBE, (2014–2020) funded by the European Regional Development Fund.
- 1.T. Kalamees, Alternatiivseid soojustusmaterjale puitkarkasshoonetele. Ehitaja 7–8, 71–72 (2002)Google Scholar
- 2.B. Berge, The ecology of building materials (Architectural Press, Oxford, 2000)Google Scholar
- 3.M.-J. Miljan, J. Miljan, Soojustusmaterjalide omaduste määramine maaehituse osakonna ehitusfüüsika laboris (Determination of thermal properties of insulation materials in the laboratory of building structures), in Kohalikud looduslikud ehitusmaterjalid ja nende kasutamine (Local Natural Building Materials and Their Use), ed. by J. Miljan (Compendium of scientific studies of Estonian University of Life Sciences, EULS, Tartu, (in Estonian), 2012), pp. 27–34Google Scholar
- 4.ISO 9869-1:2014, Thermal Insulation—Building Elements—In-situ Measurement of Thermal Resistance and Thermal Transmittance—Part 1: Heat Flow Meter Method (2014)Google Scholar
- 5.EN ISO 13788:2012, Hygrothermal Performance of Building Components and Building Elements—Internal Surface Temperature to Avoid Critical Surface Humidity and Interstitial Condensation—Calculation Methods (ISO13788:2012), Brussels (2012)Google Scholar
- 6.EVS 908-1:2016, Guidance for Calculation of Thermal Transmittance of Building Envelope Part 1: Opaque Building Envelope in Contact with Outdoor-Air (2016)Google Scholar
- 7.EN ISO 10456:2008, Building Materials and Products—Hygrothermal Properties—Tabulated Design Values and Procedures for Determining Declared and Design Thermal Values (2008)Google Scholar
- 8.J. Vinha, Hygrothermal Performance of Timber-Framed External Walls in Finnish Climatic Conditions: A Method for Determining the Sufficient Water Vapour Resistance of Interior Lining of a Wall Assembly, Tampere (2007). p. 338, appendix 3Google Scholar
- 9.EN ISO 6946:2017, Building Components and Building Elements—Thermal Resistance and Thermal Transmittance—Calculation Methods (ISO 6946:2017) (2017)Google Scholar
- 10.Minimum requirements for energy performance, The State Gazette I, 28.02.2017, 2, §12 (4) the Government of the Republic of Estonia (2017)Google Scholar