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Abstract
The results of lab tests are presented descriving the effect of moisture content on the thermal conductance of roofing systems containing insulation. Roofing systems, consisting of five tyhpes of rigid-board roof insulations with attached four ply bituminous built up membrane, were tested. Moisture was induced into the roofing system specimens by maintaining a constant water vapor pressure difference across them. Moisture gain in the insulation varied depending on the type and thickness of the insulation. A procedure was developed, using a heat flow meter apparatus to carry out thermal conductance tests on roofing specimens containing moisture. More than 200 tests were performed over a wide rage of moisture contents. The approximate distribution in the insulation was determined from core samples. Relationships between the thermal conductance and moisture are presented. The relationships show that the presence of moisture in roofing systems can cause significant increases in thermal conductance, depending on the type and thickness of the insulation.
The results of lab tests are presented descriving the effect of moisture content on the thermal conductance of roofing systems containing insulation. Roofing systems, consisting of five tyhpes of rigid-board roof insulations with attached four ply bituminous built up membrane, were tested. Moisture was induced into the roofing system specimens by maintaining a constant water vapor pressure difference across them. Moisture gain in the insulation varied depending on the type and thickness of the insulation. A procedure was developed, using a heat flow meter apparatus to carry out thermal conductance tests on roofing specimens containing moisture. More than 200 tests were performed over a wide rage of moisture contents. The approximate distribution in the insulation was determined from core samples. Relationships between the thermal conductance and moisture are presented. The relationships show that the presence of moisture in roofing systems can cause significant increases in thermal conductance, depending on the type and thickness of the insulation.
Date
12/1979
12/1979
Author(s)
L Knab; D Jankins; R Mathey
L Knab; D Jankins; R Mathey
Page(s)
816-835
816-835
Keyword(s)
moisture effect; thermal conductance; thermal performance; insulation; moisture gain; vapor pressure
moisture effect; thermal conductance; thermal performance; insulation; moisture gain; vapor pressure