Coldham's Wall Systems in Fine Homebuilding
Six techniques for R-40 Whole Wall values - including Double Stud Walls, TJI and Exterior Foam solutions
The December / January 2010 edition of Fine Homebuilding features an article by partner Bruce Coldham, AIA, on R-40 Wall Systems.
Based on an exploration he did originally for the Moomaw house, this article survey a variety of wall systems designed to achieve R-40 whole wall value. Methods include the double stud wall, Larsen truss, a Passive House inspired TJI-framed wall, an exterior Spray Foam model, exterior foam board, and a manufactured SIP wall.
Bruce discusses construction methods, air sealing and drainage plane concerns, and a variety of Pros and Cons for each method, including applicability to new construction and retrofit situations. Helpful color drawings by the FHB team complement the article nicely.
Coldham&Hartman's Moomaw Residence (Larsen Truss)
Coldham&Hartman's Town Farm (Double Stud)
Coldham&Hartman's DER - Amherst (Exterior Rigid Foam)
Passive House US (TJI Wall System)
Building Science Corporation's Case Studies (Exterior Spray Foam, Exterior Foam Board)
Peter Yost's Case Study at GreenBuildingAdvisor (Exterior Spray Foam)