TY - JOUR
T1 - Hygrothermal performance of six insulation systems for internal retrofitting solid masonry walls
AU - Jensen, Nickolaj Feldt
AU - Bjarløv, Søren Peter
AU - Rode, Carsten
AU - Andersen, Birgitte
AU - Møller, Eva B.
PY - 2021/5/1
Y1 - 2021/5/1
N2 - The study investigated the hygrothermal performance and risk of fungal growth in a phenolic foam system with a closed cell structure and a diffusion-open and capillary active lime-cork based insulating plaster, for internal retrofitting purposes. The setup comprised two 40-feet (12.2 m) insulated reefer container with controlled indoor climate, reconfigured with 24 holes (1 × 2 m each) containing solid masonry walls with embedded wooden elements on the interior side. Focus was on the conditions in the masonry/insulation interface and embedded wooden elements, and the performance of the two systems were compared to three diffusion-open insulation systems and one diffusion-tight. The effect of exterior hydrophobisation was also investigated. Relative humidity and temperature were measured in several locations in the test walls over 2½ years, and the risk of fungal growth was evaluated by on-site measurements and the VTT mould-growth model. The findings indicate that internally insulated walls with bare brick exterior surfaces performed poorly with high risk of fungal growth. The effect of exterior hydrophobisation was found to vary with the orientation and the installed insulation system, with a generally positive effect on walls facing south-west but limited effect for north-east. Furthermore, the more diffusion-tight insulation systems were found to perform better in combination with exterior hydrophobisation than the highly diffusion-open systems. The lime-cork insulating plaster showed high relative humidity and risk of moisture-induced problems. The on-site fungal tests showed no growth in the masonry/insulation interface inside the two insulation systems, probably due to high initial pH-value.
AB - The study investigated the hygrothermal performance and risk of fungal growth in a phenolic foam system with a closed cell structure and a diffusion-open and capillary active lime-cork based insulating plaster, for internal retrofitting purposes. The setup comprised two 40-feet (12.2 m) insulated reefer container with controlled indoor climate, reconfigured with 24 holes (1 × 2 m each) containing solid masonry walls with embedded wooden elements on the interior side. Focus was on the conditions in the masonry/insulation interface and embedded wooden elements, and the performance of the two systems were compared to three diffusion-open insulation systems and one diffusion-tight. The effect of exterior hydrophobisation was also investigated. Relative humidity and temperature were measured in several locations in the test walls over 2½ years, and the risk of fungal growth was evaluated by on-site measurements and the VTT mould-growth model. The findings indicate that internally insulated walls with bare brick exterior surfaces performed poorly with high risk of fungal growth. The effect of exterior hydrophobisation was found to vary with the orientation and the installed insulation system, with a generally positive effect on walls facing south-west but limited effect for north-east. Furthermore, the more diffusion-tight insulation systems were found to perform better in combination with exterior hydrophobisation than the highly diffusion-open systems. The lime-cork insulating plaster showed high relative humidity and risk of moisture-induced problems. The on-site fungal tests showed no growth in the masonry/insulation interface inside the two insulation systems, probably due to high initial pH-value.
KW - Indvendig efterisolering
KW - massivt murværk
KW - felt undersøgelser
KW - hydrofobering
KW - skimmel modellering
KW - on-site skimmel obsevationer
KW - Internal insulation
KW - Solid masonry
KW - field study
KW - Hydrophobisation
KW - mould modelling
KW - On-site mould observations
KW - solid masonry
KW - hydrophobisation
KW - on-site mould observations
UR - https://data.dtu.dk/articles/dataset/Supplementary_data_for_Hygrothermal_performance_of_six_insulation_systems_for_internal_retrofitting_solid_masonry_walls_/12458207
UR - http://www.scopus.com/inward/record.url?scp=85101111773&partnerID=8YFLogxK
U2 - 10.1177/1744259120988745
DO - 10.1177/1744259120988745
M3 - Journal article
SN - 1744-2591
VL - 44
SP - 539
EP - 573
JO - Journal of Building Physics
JF - Journal of Building Physics
IS - 6
ER -