Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/9555
Title: Roof leaks in cold regions : school at Chevak, Alaska
Authors: United States. Bureau of Indian Affairs. Division of Facilities Engineering
Tobiasson, Wayne
Johnson, Philip R.
Keywords: Buildings
Subarctic regions
Condensation
Leakage
Roofs
Snow
Snow and ice control
Roof repair
Roof maintenance
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: CRREL report ; 80-11.
Description: CRREL Report
Abstract: Four types of roof leaks occurred at a new school building in Chevak, Alaska: 1) blowing snow entered the roof through eave vents and then melted, 2) slush and ice in roof valleys caused meltwater to overflow the valley flashing and run into the building, 3) water entered at a roof/wall intersection and 4) in many areas water entered through gaps in the sloping plywood deck. Sealing the eave vents made it impossible for blowing snow to enter the roof at the eaves. Electric heat tapes eliminated the valley icing problem. Missing flashing was responsible for the roof/wall intersection leaks. The absence of a vapor barrier in the roof was the cause of many leaks. We recommended that the roof be repaired from the exterior by removing component elements down to the plywood deck, installing an adhered continous vapor barrier and reassembling the roof. An alternative roof cladding of composition shingles was discussed as was conversion to a "cold roof." The roof was repaired and modified following our recommendations , and problems appear to have been solved.
Rights: Approved for public release; distribution is unlimited.
URI: http://hdl.handle.net/11681/9555
Appears in Collections:CRREL Report

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