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Description: Polyurethane foam insulation (PUFI) sprayed on galvanized steel was subjected for 375 days to thermally induced vapour pressure gradients. The 4warm' side of thePUFI was exposed to a temperature of25?C and 90% relative humidity, while the 'cold' steel side temperature was cycled from -8?C to 5?C every 6 hours to simulate freeze/thaw conditions.After 375 days of testing (800 kPa?d of vapour pressure days), the PUFI had absorbed 2.7% water byvolume, mcreasing its overall thermal conductivity from about 24 mW?m' ??C" to 32 mWtm'^C*1. Thismeansa loss in thermalresistance of about25%. An asphaltic type vapour barrier was very effective in preventing moisture migration into the PUFI and theembedded wood framing members. Alternativeconstruction techniques require further inves tigation.

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Citation: H.W. Fraser and J.C. Jofriet 1993. THERMAL BEHAVIOUR OF POLYURETHANE FOAM INSULATION. Canadian Agricultural Engineering 35(1):57-65.
Volume: 35
Issue: 1
Pages -
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Date: 1993
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Type: Text.Article
Format: PDF
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Coverage: Canada
Language 1: en
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Rights: Canadian Society for Bioengineering
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