Determine the winter R–value and the U–factor of a masonry cavity wall that consists of 100-mm common bricks. a 90:mm air space, 100-mm concrete blocks made of light- weight aggregate, 20-mm air space, and 13-mm gypsum wallboard separated from the concrete block by 20-mm-thick (1-in × 3-in nominal) vertical furring whose center-to-center distance is 400 mm. Neither side of the two air spaces is coated with any reflective films. When determining the /J-value of the air spaces, the temperature difference across them can be taken to be 16.7°C with a mean air temperature of 10°C. The air space constitutes 84 percent of the heat transmission area, while the vertical furring and similar structures constitute 16 percent. Answers: 1.02 m2·°C/W, 0.978 W/m2·K
FIGURE P3-156
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