Field monitoring of cellulose in walls - Edmonton / prepared for Canada Mortgage and Housing Corporation, Project Implementation Division ; prepared by Building Envelope Engineering ; John A. Vlooswyk.: NH15-590/1990E-PDF

"A test program was completed to evaluate the effect of wet-sprayed cellulose insulation on the performance of wall components in wood-frame construction. Of particular concern to this program was the rate of drying and the effect of moisture on building components within the wall. In addition, tests were completed on a typical Alberta residence to evaluate the effect of wet-sprayed cellulose on air leakage. Wood moisture sensors were installed in seven different wall sections or orientations. Point-in-time monitoring of the sensors continued for a period of one year. Initial wood moisture contents were relatively dry. Wet-sprayed cellulose increased wood component moisture contents almost to the point of fibre saturation, within 30 days of installation. Framing components dried to near pre-installation moisture content within six months. The rate of drying was affected by ambient conditions, ventilation of the cavity, orientation, time allowed to dry prior to gypsum board installation and construction conditions. Air leakage tests of the house determined an air leakage rate of 2.0 air changes/hour at 50 pascals. Various sources of air leakage were detected, most unrelated to the wall cavities. The cellulose provided some resistance to air flow at rim joists; however, pressure drop tests across the wall section indicated that the cellulose cannot be considered an air barrier. Exterior sheathing provided a majority of the air resistance across the wall sections tested. Examination of sections of the exterior walls one year after construction gave limited evidence of deterioration"--Executive summary, p. iv.

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