Call number:
ZSP-201-76/2
In:
CRREL Report, 76-2
Description / Table of Contents:
The repair and maintenance costs of low slope roofs are high and their life expectancy is less than desired. The increasing use of insulation is accompanied by a greater incidence of problems. The experience in cold regions amplifies these experiences. Protected membrane roofs have the prerequisites for better performance and the experience to date is encouraging. The results of performance measurements of three roofs built by the Corps of Engineers verify that the membrane remains at nearly constant temperature, independent of the weather, and that the insulation retains its integrity despite periodic wetting. Moisture absorption is slow and appears to stabilize in time due to the self-drying nature of the roof. Heat losses are increased due to rain, and extra insulation should be added to compensate for these losses. The resistance of protected membrane roofs to fire, traffic, impact, and other adverse forces is superior. So far, the initial cost of protected membrane roofs is at a premium, primarily due to the cost of concrete pavers. The initial cost premium can be justified, however, by the reduced repair and maintenance costs as indicated to date, and by the longer life expectancy of the protected membrane. The high probability of superior performance and cost effectiveness is a compelling reason to incorporate protected membrane roofs increasingly in Government construction.
Type of Medium:
Series available for loan
Pages:
v, 27 Seiten
,
Illustrationen
Series Statement:
CRREL Report 76-2
URL:
https://cdm16021.contentdm.oclc.org/digital/collection/p266001coll1/id/6409
Language:
English
Note:
CONTENTS
Page
Abstract
Preface
Introduction
Low slope roof problems and repair costs
Protected membrane roofs and materials
Installations of protected membrane roofs
Performance evaluation
Test program
Effectiveness
Thermal efficiency
Heat balance
Internal cooling due to rain
Moisture absorption and thermal conductivity of insulations
Durability and life expectancy
Fire resistance
Patent considerations
Costs of roofs
Design considerations
Proposed specifications
Conclusions and recommendations
Literature cited
Location:
AWI Archive
Branch Library:
AWI Library
