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Impact of moisture on long term performance of insulating products based on stone wool
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Demands for energy have been increasing in the whole world. According to higher consumption, the price of energy rises yearly too. This evokes usage of insulating products in a wider range. By adding insulation, we lower the amount of energy needed to heat our homes, resulting in fewer associated greenhouse gas emissions and a lower monthly heating bill. Savings depend on insulation thicknesses and on conditions, in which the insulant is kept. Mineral insulation based on stone wool is also a member of building insulants that defends buildings and constructions against temperature changes of the ambient. However, even when we use modern technologies and building techniques to reduce high energy losses, we can never provide unimpeachable protection of stone wool from damage. During a construction process on a building site or at fast climate changes, it often happens that stone wool is exposed to rain precipitaions or other climate effets. This brings water to the insulating structure. Besides the loss of insulating qualities, the stone wool is left permanently wet. Even the fibres of stone wool are inorganic, they still can be attacked by degradation processes due to organic agents fixing fibres together. Analysis of damaged flat-roof constructions using stone wool and verification of material properties is a starting point of this licentiate thesis.

The attached paper section can be divided into two parts:

In-situ practice that notes troubles with insulating materials based on stone wool with inbuilt moisture on a building site

Laboratory measurement that observe material properties of stone wool under varying conditions

Place, publisher, year, edition, pages
Stockholm: KTH , 2007. , viii, 62 p.
Series
Meddelande. Institutionen för byggvetenskap, ISSN 1651-5563 ; 200
Keyword [en]
Mineral insulation, Stone wool, Material properties, Moisture transport, Heat transport, Test equipment, Moisture properties, Frost formation
National Category
Building Technologies
Identifiers
URN: urn:nbn:se:kth:diva-4490ISBN: 91-7178-637-6 (print)OAI: oai:DiVA.org:kth-4490DiVA: diva2:12526
Presentation
2007-09-21, Inst. för Byggvetenskap, KTH, Brinellvägen 34, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101122Available from: 2007-09-19 Created: 2007-09-19 Last updated: 2010-11-22Bibliographically approved
List of papers
1. Impact of moisture on long term performance of insulating products
Open this publication in new window or tab >>Impact of moisture on long term performance of insulating products
2005 (English)In: Proceedings of the Nordic Symposium on Building Physics, Reykjavik, 2005, Vol. 1, 71-77 p.Conference paper, Published paper (Refereed)
National Category
Building Technologies
Identifiers
urn:nbn:se:kth:diva-7484 (URN)
Conference
The 7th symposium on Building Physics in the Nordic Countries - Reykjavík, June 2005
Note
QC 20100818Available from: 2007-09-19 Created: 2007-09-19 Last updated: 2010-11-22Bibliographically approved
2. Examination of wall constructions - Inbuilt moisture in wall constructions of a newly built apartment house
Open this publication in new window or tab >>Examination of wall constructions - Inbuilt moisture in wall constructions of a newly built apartment house
(English)Manuscript (Other academic)
National Category
Building Technologies
Identifiers
urn:nbn:se:kth:diva-7485 (URN)
Note
QC 20101122Available from: 2007-09-19 Created: 2007-09-19 Last updated: 2010-11-22Bibliographically approved
3. A laboratory equipment for the study of moisture processes in thermal insulation materials when placed in a temperature field
Open this publication in new window or tab >>A laboratory equipment for the study of moisture processes in thermal insulation materials when placed in a temperature field
2008 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 22, no 12, 2335-2344 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this paper was to describe design and use of a laboratory set-up that makes a very well controlled moisture load to detect material properties of thermal insulation materials. The outer shell of the set-up is a plastic box with thermal insulation on its outer side. This box is placed on a balance for recording of weight loss of the entire system. The sample to be tested is placed on top of this box. The inside of the box is heated electrically and the air circulation is driven by a fan. There is a water reservoir in the box, which is also placed on a balance in order to record the amount of moisture added to the air in the box. To obtain the highest moisture contents it was found necessary to use a wick in the reservoir that increases transport of moisture to the air in the box. The whole set-up was placed in a climate chamber in order to get well controlled temperature and moisture content for the outside of the box. In this way, well controlled gradients of temperature and moisture content in air were achieved around the specimen. The set-up was found to function well and was in this study useful for measurement of the samples moisture resistance factor.

Keyword
Moisture properties, Moisture transport, Test equipment, Thermal insulation
National Category
Building Technologies Materials Engineering
Identifiers
urn:nbn:se:kth:diva-7486 (URN)10.1016/j.conbuildmat.2007.10.007 (DOI)000259168500007 ()2-s2.0-48549093448 (Scopus ID)
Note
QC 20100818Available from: 2007-09-19 Created: 2007-09-19 Last updated: 2017-12-14Bibliographically approved
4. Frost formation and condensation in stone-wool insulants
Open this publication in new window or tab >>Frost formation and condensation in stone-wool insulants
2009 (English)In: Construction and building materials, ISSN 0950-0618, Vol. 23, 1775-1787 p.Article in journal (Refereed) Published
Abstract [en]

This paper reports on a laboratory experiment concerning frost formation and moisture condensation in fibrous insulation based on stone–wool. Frost formation in samples of stone–wool open to air was noted in cases when temperature field over the specimen was between +20 and −20 °C and air on the warm side was saturated with moisture.

Frost accumulated with time in the part of the specimen facing the cold air. In the part of the specimen facing the warm humid air condense formation occurred. In this part the material had moisture content considerably higher than what could be anticipated from data such as moisture isotherms.

Border between frost and liquid condensate was quite sharp in the specimens of higher density. Moisture content mass by mass has an upward trend with decreasing density of the material sample. Moisture resistance factor was found to be quite high at these circumstances. Reason for this is not clear.

Keyword
Stone–wool; Material properties; Frost formation; Condensation; Moisture transport; Moisture capacity
National Category
Materials Engineering Building Technologies
Identifiers
urn:nbn:se:kth:diva-7487 (URN)10.1016/j.conbuildmat.2008.10.014 (DOI)000264786100010 ()2-s2.0-59649115607 (Scopus ID)
Note
QC 20100818Available from: 2007-09-19 Created: 2007-09-19 Last updated: 2012-01-18Bibliographically approved

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