Masonry Magazine March 2011 Page. 54
INDUSTRY NEWS
This study was initiated due to moisture issues having become an increasing concern in residential construction. While builders address growing demands for occupant comfort and energy efficiency, modern construction practices have resulted in tight walls that are highly insulated and sealed against air filtration. When moisture is not sufficiently controlled with these lighter, tighter building methods, the risk of mold growth, wood rot and infestation by insects, reduced efficiency of insulation and corrosion of fasteners embedded in wood all increase dramatically. The report attributes the lower moisture content in the wood components to brick's inherent thermal mass properties, the one-inch air space in the brick veneer wall and the increased thermal absorptance of the test brick's red color.
The field study was designed to collect moisture performance values at regular intervals from key components within a pair of wall assemblies constructed with each of eight different cladding types. Each wall assembly consisted of interior gypsum board, wood studs with fiberglass insulation between the studs, sheathed with either OSB or plywood and clad with brick veneer, vinyl siding, fiber cement, manufactured stone or stucco.
Each wall assembly was then subjected to ambient weather conditions over a one-year period. In addition, a portion of water resistant barrier was compromised and the wall assembly behind it subjected to a daily water injection over a five-day period to evaluate its ability to dry after a leak.
The data recorded for each wall assembly included wood stud moisture content, wood-based sheathing moisture content, stud bay relative humidity and stud bay temperature. While all assemblies performed adequately under normal conditions, brick performed significantly better overall. IMAS
To download a complete copy of this report, go to www.gobrick.com/nahbrcreport
Index to Advertisers
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SPEC MIX, INC.
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52 MASONRY
March 2011
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