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Monitoring of Unvented Roofs with Diffusion Vents and Interior Vapor Control in a Cold Climate

Building Science Corporation and partners will evaluate the use of a vapor control membrane, or diffusion vent, which could substantially reduce the risk of moisture issues in roof assemblies with fibrous insulation. This project will field test this solution in a cold climate new construction test house over three years, and will also test the approach in a high impact existing home weatherization application to be determined through stakeholder engagement.

Program Information
Funding Organization: 
Department of Energy
Program Area: 
Residential Buildings Integration
Building America
Project Manager: 
Eric Werling
Agreement Type: 
Funding Opportunity
Funded Performer: 
Building Science Corporation
Partners (not funded): 
Hovnanian Homes, DuPont, Owens Corning, Cosella-Drken Products, Inc., NAIMA, Nu-Wool
Agreement Total: 
Match Total: 
Project Start Date: 
August 01, 2016
Project End Date: 
August 31, 2019
Project Details
Ongoing Initiative or Research Project: 
Research Project
Grid, Whole Building, or Technology: 
Technology Type: 
Sub-Technology Type: 
Enclosure - Attics/Roof
Building Type: 
Single Family
New or Existing: 
DR Focus?: 
Code/Standard Focus?: 
BA Climate Region: 
Cold/Very Cold
IECC Climate Region: 
Zone 5