Stone-wool insulation under offence of massive condensation and ice formationand their impact on moisture properties
(English)Manuscript (preprint) (Other academic)
Building constructions are often under the offense of condensation. In extreme cases, watercondensation can also be accompanied by formation of frost in layers adjacent to outdoorsurfaces. In general, these problems happen due to sudden climate changes during buildingworks, misuse of building materials or delayed work on sites. Troubles with moisture proceedin the layer of thermal insulation thanks to its high moisture capacity and material thickness.Mineral wool is one of the most used thermal insulation materials in the building industry.Previous research and measurements have proved that fibrous insulations (e.g. stone wool)have varying material properties, when wet. Both thermal and moisture properties arechanged.
This paper refers to laboratory tests concentrating on existence of frost formation in stonewoolspecimens exposed to extreme moisture load and temperature gradients (Vrána, Björk,2008). The executed research of that study did show that moisture resistance factor (μ-valueor μ-factor) is affected by condensation and freezing in the material. This paper illustrates acalculation model based on the monitored indoor and outdoor data (surface T and RH) of thetested materials. These climate data were used to create a functional mathematical model thatcan simulate moisture balance of stone wool. Finally, the model was compared to outputobtained from laboratory measurements.
Stone wool, Material properties, Frost formation, Condensation, Moisture transport, μ-value, Sorption curves
Building Technologies Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-11680OAI: oai:DiVA.org:kth-11680DiVA: diva2:279247
QC 201008182009-12-022009-12-022010-08-18Bibliographically approved