Monitoring of Unvented Roofs with Fibrous Insulation, Diffusion Vents, and Interior Vapor Control in a Cold Climate
Unvented roof assemblies have been accepted in North American building codes since 2007; code-compliant construction calls for a minimum thickness of “air-impermeable insulation” (based on climate zone) to avoid cold-weather condensation and moisture risks. This is typically implemented with polyurethane spray foam insulation; however, negatives of this material include high first cost and possible adverse environmental impacts. Implementing unvented roofs in a moisture-safe manner with air-permeable fibrous fill insulations (e.g., fiberglass or cellulose) could potentially reduce the first cost of unvented roof designs, allowing for more widespread use. Building unvented roofs in a cost-effective, airtight, and moisture-safe manner opens up options for high-performance house designers and builders.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office
- Contributing Organization:
- Dupont Shelter Solutions; North American Insulation Manufacturers Association; Owens Corning; Nu-Wool; Dorken Systems Inc.
- DOE Contract Number:
- AC36-08GO28308; EE0007570
- OSTI ID:
- 1677422
- Report Number(s):
- NREL/TP-5500-77518; DOE/GO-102020-5450; MainId:27454; UUID:4b5913c5-3fb2-4c0b-b347-e3bf2f430d42; MainAdminID:18509
- Country of Publication:
- United States
- Language:
- English
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