ICE ON ROOFS.
Abstract
The formation of ice dams on the eaves of sloping roofs often causes water leakage through roofing composed of overlapping watershedding units. Snow melting on the roof and freezing at the eaves is the cause of ice damming. Snow melting is due chiefly to heat loss from the building through the roof or from attic spaces, although some melting can occur from sun radiation. Temporary relief can be obtained from the effects of ice dams by clearing the snow off the roof, particularly at the eaves, and by knocking ice formations from the eaves and valley ends, taking care not to damage the roofing. For a more permanent solution and to limit the formation of dams, consideration must be given to more adequate roof or ceiling insulation, ventilation of air spaces above the insulation, and moderation of inside temperatures. Leakage can usually be avoided by using wide overhangs, wide impervious flashings or roofing at the eaves, or heating cables to melt drainage channels through the ice. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1967
- Accession Number
- AD0675301
Entities
People
- M. C. Baker
Organizations
- National Research Council Canada