Transcription of Double Stud Walls - Duluth Energy Design
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Double Stud Walls - Duluth Energy Design
51 Double Stud Walls Familiar assemblies, common materials Blown in insulation can be cellulose, fiberglass, or open cell spray foam. 52 Double stud key issues ! Locating the air barrier and keeping it robust. ! Because the sheathing will be colder in winter, wall should be able to dry to the outside. ! Plywood and structural fiberboard are a better sheathing choice than OSB. ! A gap between sheathing and siding is ideal. ! Fire blocking is required by code. ! Window and door openings need special attention inside and out. Air and Moisture Management OPTIONS ! Interior sheet polyamide ! Interior OSB ! Exterior Sheathing taped ! Use of Spray Foam ! Interior cavity wall ! Larsen truss outboard 53 54 Window and door framing Openings require special framing details, not complicated if thought out in advance and drawn. 55 Window to the outside with box frame 56 Door at the Outer Wall for best water management 57 The results can be dramatic 58 Double Stud wall to floor to roof 59 Alternate super-insulated Rim Assembly Insulating the rim with cellulose was easier than we imagined But usually we use 2-3 applications of 2-part closed cell urethane spray foam This detail was labor intensive in order to maintain the air barrier 60 Single Stud Walls with Exterior Foam Sheathing Especially good for retrofit application Good for simple building forms 1 foam is not enough in our climate Siding typically requires furring 61 Integrates well with vertical slab edge insu
71 Windows for a cold climate 1. High solar gain ! Min 0.5 glazing SHGC or ! 0.4 whole window value 2. High thermal performance
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