1. Using the appropriate table from the text, determine the R-value for the following components/ materials....

 

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1. Using the appropriate table from the text, determine the R-value for the following components/ materials. Ignore the inside and outside surface resistances. Show your calculations. a. A concrete tilt-up panel consisting of a 5% in. concrete structural wall, 2 in. of polyisocyanurate (ISO) boards, and 2½ in. of architectural concrete. All concrete is normal weight. | b. A 2x4 stud wall with 3-1/2 in. of polyurethane foam cavity insulation, in. of gypsum wall board on the inside, and %2 in. of OSB sheathing, a ½ in. air space, and %2 in. of solid wood siding on the exterior. (Neglect the presence of the studs.) Note that there is an error in Table 5.2. The resistivity of plywood and OSB is 1.4 not 0.14 -See Example 5.4 on page 122. c. A double strength (1/8 in. thick) glass sheet. d. A 6" thick structural lightweight concrete wall (take = 0.3) covered with 1-1/2" thick extruded polystyrene and a 1/8" total thickness of synthetic stucco on the outside. (The synthetic stucco can be assumed to have the same resistivity as Portland cement plaster.) 1. Using the appropriate table from the text, determine the R-value for the following components/ materials. Ignore the inside and outside surface resistances. Show your calculations. a. A concrete tilt-up panel consisting of a 5% in. concrete structural wall, 2 in. of polyisocyanurate (ISO) boards, and 2½ in. of architectural concrete. All concrete is normal weight. | b. A 2x4 stud wall with 3-1/2 in. of polyurethane foam cavity insulation, in. of gypsum wall board on the inside, and %2 in. of OSB sheathing, a ½ in. air space, and %2 in. of solid wood siding on the exterior. (Neglect the presence of the studs.) Note that there is an error in Table 5.2. The resistivity of plywood and OSB is 1.4 not 0.14 -See Example 5.4 on page 122. c. A double strength (1/8 in. thick) glass sheet. d. A 6" thick structural lightweight concrete wall (take = 0.3) covered with 1-1/2" thick extruded polystyrene and a 1/8" total thickness of synthetic stucco on the outside. (The synthetic stucco can be assumed to have the same resistivity as Portland cement plaster.)

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