New England’s Favorite Roof Retrofit: Moisture Data from Three MA Case Studies

Dense packing cellulose in roof slopes has been a common insulation retrofit strategy in New England for a long time, however technically it has not been allowed by code without the inclusion of venting or foam insulation at the roof sheathing for condensation control. Previous BuildingEnergy presentations have suggested that further research should be done to evaluate whether vented attic space above unvented dense-packed slopes could manage moisture more effectively than insulating all the way up to the ridge. Byggmeister and Building Science Corp have collected 2 years of monitoring data on 3 case studies of this type and will be presenting this data and discussing future implications.