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Title: Technology Solutions Case Study: Monitoring of Double Stud Wall Moisture Conditions in the Northeast, Devens, Massachusetts

Double stud walls have a higher risk of interior-sourced condensation moisture damage when compared with high-R approaches using exterior insulating sheathing. In this project, Building Science Corporation monitored moisture conditions in double-stud walls from 2011 through 2014 at a new production house located in Devens, Massachusetts. The builder, Transformations, Inc., has been using double-stud walls insulated with 12 in. of open cell polyurethane spray foam (ocSPF); however, the company has been considering a change to netted and blown cellulose insulation for cost reasons. Cellulose is a common choice for double-stud walls because of its lower cost (in most markets). However, cellulose is an air-permeable insulation, unlike spray foams, which increases interior moisture risks. The team compared three double-stud assemblies: 12 in. of ocSPF, 12 in. of cellulose, and 5-½ in. of ocSPF at the exterior of a double-stud wall (to approximate conventional 2 × 6 wall construction and insulation levels, acting as a control wall). These assemblies were repeated on the north and south orientations, for a total of six assemblies.
Publication Date:
OSTI Identifier:
1220429
Report Number(s):
DOE/GO-102015-4590
7032
Research Org:
Building Science Corporation
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B) (Building America)
Country of Publication:
United States
Language:
English
Subject:
RESIDENTIAL; RESIDENTIAL BUILDINGS; BSC; BUILDING SCIENCE CORPORATION; BUILDING AMERICA; DURABILITY; MOISTURE; MOISTURE MONITORING; DOUBLE STUD; HIGH-R VALUE; HIGH-R WALLS; MOLD; CELLULOSE; SPRAY FOAM; OPEN CELL SPRAY FOAM