Last summer, JLC reported on research by Kohta Ueno of Building Science Corp. (BSC) into moisture accumulation in double-stud walls (see “Studying Moisture in Fat Walls,” Jun/14). Ueno had planted moisture meters on the sheathing of a 12-inch-thick stud wall in a zero-energy house in Devens, Mass., built by Transformations Inc.

Transformations’ standard wall system, in place in dozens of homes in a Devens development, is a 12-inch double-stud wall sheathed with Huber Zip sheathing and insulated with medium-density open-cell polyurethane foam, spray-applied in the field. But Carter Scott, Transformations’ president, wanted to know if dense-pack cellulose insulation,...

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