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Abstract
Current methods for evaluating the moisture absorption of plastic insulations due to vapor pressure gradients or immersion rely on short time periods to predict long-term performance. This procedure may not provide accurate information on performance because in practice insulations may absorb more moisture than these tests indicate. A series of tests was conducted on extruded polystyrene roof insulation that had been in place, exposed to environmental moisture and pressure gradients, for a maximum of 36 months. Results indicate that moisture absorption of 1.5 percent by volume can be expected in the field.
Current methods for evaluating the moisture absorption of plastic insulations due to vapor pressure gradients or immersion rely on short time periods to predict long-term performance. This procedure may not provide accurate information on performance because in practice insulations may absorb more moisture than these tests indicate. A series of tests was conducted on extruded polystyrene roof insulation that had been in place, exposed to environmental moisture and pressure gradients, for a maximum of 36 months. Results indicate that moisture absorption of 1.5 percent by volume can be expected in the field.
Date
10/1976
10/1976
Author(s)
David Schaefer
David Schaefer
Page(s)
15
15
Keyword(s)
cold weather construction; insulation; water absorption; protected membrane
cold weather construction; insulation; water absorption; protected membrane