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Abstract
A recently Danish study reported that no vapour barrier is needed in ceilings, if the attic is well ventilated and the ceiling towards the dwelling is airtight. Based on that study, new investigations were initiated with focus on the hygrothermal behaviour in ventilated attics with different air change rates. A test house with three sets of four different ceiling constructions – all airtight – was used in this study. The ventilation rate was reduced in two of the sets with approx. 35 % and 50 %, respectively. Air change rates were measured with tracer gas. Furthermore, temperature and relative humidity was measured every hour. Measurements in similar ceilings with mineral wool or cellulose-based insulation material show that hygroscopic properties of the insulation have very limited effect on relative humidity. Furthermore, only at low ventilation rate the effect of a vapour barrier could be measured with minor impact. Based on the short-measured period the calculations of the risk of mould growth showed no risk. The results indicate that even when the ventilation is reduced by 50 %, the ventilated attic still performs well if the ceiling is highly airtight. However, the importance of vapour barriers becomes more important at lower air change rates.
Original language | English |
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Title of host publication | 12th Nordic Symposium on Building Physics (NSB 2020) |
Editors | J. Kurnitski , T. Kalamees |
Number of pages | 7 |
Publisher | EDP Sciences |
Publication date | 30 Jun 2020 |
Pages | 1-7 |
Article number | 07008 |
DOIs | |
Publication status | Published - 30 Jun 2020 |
Event | 12th Nordic Symposium on Building Physics, NSB 2020 - Tallinn, Estonia Duration: 6 Sept 2020 → 9 Sept 2020 |
Conference
Conference | 12th Nordic Symposium on Building Physics, NSB 2020 |
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Country/Territory | Estonia |
City | Tallinn |
Period | 06/09/2020 → 09/09/2020 |
Series | E3S Web of Conferences |
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Volume | 172 |
ISSN | 2267-1242 |
Fingerprint
Dive into the research topics of 'Hygrothermal conditions in ventilated attics with different air change rates and ceiling constructions'. Together they form a unique fingerprint.Projects
- 1 Finished
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Behov for dampspærrer i lofter
Hansen, T., Møller, E. B. & Peuhkuri, R. H.
01/03/2015 → 31/05/2020
Project: Research
Research output
- 1 Citations
- 1 Article in proceeding
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Air change rate in ventilated attics – reality and input for simulations
Møller, E. B., Morelli, M. & Hansen, T., Sept 2019, MATEC Web of Conferences: 4th Central European Symposium on Building Physics (CESBP 2019). Černý, R., Kočí, J. & Kočí, V. (eds.). Prague, Czech Republic: EDP Sciences, p. 1-6 6 p. 02073. (MATEC Web of Conferences, Vol. 282).Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review
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