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Abstract
Moisture is a roof's No. 1 enemy. In cold regions, moisture attacks a roof as water vapor, condensation and frost from below, and as rain, snow, ice and meltwater from above. Weather conditions play an important role in the construction of a roof, and in cold regions there are increased opportunities for weather-related problems during construction. Once the roof is built, snow loads, strong winds, extreme seasonal temperature variations, rapid diurnal temperature changes and large sustained vapor pressure gradients across the roof impose harsh stresses on the roof system. Structural movements induced by frost action or permafrost degradation can introduce additional problems. In this paper, current topics relating to roofing technology in cold regions are examined for sloped roofs with water-shedding surfaces and other roofs having watertight membranes.
Moisture is a roof's No. 1 enemy. In cold regions, moisture attacks a roof as water vapor, condensation and frost from below, and as rain, snow, ice and meltwater from above. Weather conditions play an important role in the construction of a roof, and in cold regions there are increased opportunities for weather-related problems during construction. Once the roof is built, snow loads, strong winds, extreme seasonal temperature variations, rapid diurnal temperature changes and large sustained vapor pressure gradients across the roof impose harsh stresses on the roof system. Structural movements induced by frost action or permafrost degradation can introduce additional problems. In this paper, current topics relating to roofing technology in cold regions are examined for sloped roofs with water-shedding surfaces and other roofs having watertight membranes.
Date
4/1979
4/1979
Author(s)
Wayne Tobiasson
Wayne Tobiasson
Page(s)
Keyword(s)
eave icing; vapor retarder; claddings; cold weather; moisture; water vapor; condensation; weather conditions
eave icing; vapor retarder; claddings; cold weather; moisture; water vapor; condensation; weather conditions