Roof Blisters: Cause and Cure

Blisters are a major problem of built-up roof membranes. They are caused by voids built into the roof during construction. They develop into the characteristic dome-shaped humps by a breathing action driven by thermal cycling. A small pressure relief vent was patented by CRREL as a cost-effective wa...

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Bibliographische Detailangaben
Hauptverfasser:	Korhonen, Charles, Charest, Brian
Format:	Report
Sprache:	eng
Schlagworte:	AGING(MATERIALS) Air Condition, Heating, Lighting & Ventilating BITUMENS BITUMINOUS COATINGS BLISTERS BUBBLES COST EFFECTIVENESS CYCLIC LOADS DEFECTS(MATERIALS) EMBRITTLEMENT GASES LIFE EXPECTANCY(SERVICE LIFE) MEMBRANES REPAIR RESPIRATION ROOFS Structural Engineering and Building Technology THERMAL EXPANSION THERMAL STRESSES VENTS VOIDS WEATHERING
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Beschreibung
Zusammenfassung:	Blisters are a major problem of built-up roof membranes. They are caused by voids built into the roof during construction. They develop into the characteristic dome-shaped humps by a breathing action driven by thermal cycling. A small pressure relief vent was patented by CRREL as a cost-effective way to repair blisters. Though these vents cannot prevent blisters from forming, they can lengthen a roof's service life by repairing the blisters before they break. Two demonstration projects were conducted to transfer the blister vent technology to the military community. Most participants in the demonstration projects found the vent easy to use and that it performed as designed. The main objection to the vent was its price. (MM)