Membrane and Flashing Condition Indexes for Built-Up Roofs. Volume 1. Development of the Procedure.
CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL
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Because no systematic procedures exists to determine priorities and select repair strategies for low-slope roofs, the U.S. Army Construction Engineering Research Laboratory USA-CERL is developing a roof maintenance management system that will provide a practical decisionmaking procedure to identify cost-effective repairs. This volume describes part of the overall system the development and verification of roof condition indexes for rating built-up roofs, based on a visual distress survey. Separate indexes were developed for the membrane and flashing components. Each index is expressed as a numerical rating ranging from 0 to 100, and provides a measure of the components ability to perform its function, needed level of maintenance, and leak potential. The roof condition indexes have been field tested and validated through the assistance of several roof experts from both the military and private sectors. The testing was conducted at seven different military installations located in widely different climates. Field tests indicated that computed condition indexes correlate highly with the mean subjective ratings of experienced roof experts. Volume II presents the distress types, severity levels, and measurement criteria. The manual also presents procedures for distress density calculations necessary to determine the indexes.
- Structural Engineering and Building Technology