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Abstract
Although a properly installed asphalt shingle roof is watertight, it probably isn't vapor-tight. Researchers in Houston, Texas and Raleigh, North Carolina have discovered that the mornin sun shining on a dew-soaked asphalt shingle roof will drive moisture through the asphalt felt and OSB sheathing into the rafter cavity. These new findings raise new caution flags.
Although a properly installed asphalt shingle roof is watertight, it probably isn't vapor-tight. Researchers in Houston, Texas and Raleigh, North Carolina have discovered that the mornin sun shining on a dew-soaked asphalt shingle roof will drive moisture through the asphalt felt and OSB sheathing into the rafter cavity. These new findings raise new caution flags.
Date
1/2003
1/2003
Author(s)
Bruce Davis; Joe Lstiburek; Armin Rudd
Bruce Davis; Joe Lstiburek; Armin Rudd
Page(s)
7-9
7-9
Keyword(s)
asphalt shingles; solar vapor drive; steaming roof;
asphalt shingles; solar vapor drive; steaming roof;