Call number:
ZSP-201-80/11
In:
CRREL Report, 80-11
Description / Table of Contents:
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 continuous 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.
Type of Medium:
Series available for loan
Pages:
iv, 12 Seiten
,
Illustrationen
Series Statement:
CRREL Report 80-11
URL:
https://cdm16021.contentdm.oclc.org/digital/collection/p266001coll1/id/6434
Language:
English
Note:
CONTENTS
Abstract
Preface
Conversion factors
Introduction
Description of school
Roof problems
Snow infiltration leaks
Valley leaks
Intersection leaks
Condensation leaks
Tests to verify the cause of condensation leaks
Eliminating the condensation leaks
Recommendations for eliminating condensation leaks
Repairing existing roof
An alternative roof cladding
The "cold roof" alternative
Repairs and modifications
Summary and conclusions
Location:
AWI Archive
Branch Library:
AWI Library
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