Roof Vent Retrofit From the Outside In
Reroofing is the perfect time to lift the hood and make short work of an otherwise awkward venting job
Synopsis: This article details the process of venting, air-sealing, and insulating the area along exterior walls where the rafters meet the top plate. By combining the work with roofing replacement, most of the job can be done from outside. A series of step-by-step photographs shows the process of removing the sheathing and propping up the roof; building, adding, and fastening baffles; and reinstalling the sheathing.
The roofs in a lot of older houses with unconditioned attics aren’t properly vented, and that can be a problem in many climates. Ventilation helps keep the roof deck dry, and, combined with air-sealing and insulation, helps prevent ice dams when it’s cold.
The most challenging part of venting, air-sealing, and insulating an attic in an old house is dealing with the area along the exterior walls where the rafters meet the top plate. The space between the rafters and ceiling joists is…