THE R-VALUE TABLES ARE BELOW: Q1. Insulation You are building an addition onto y
ID: 1711825 • Letter: T
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THE R-VALUE TABLES ARE BELOW: Q1. Insulation You are building an addition onto your seafood restaurant that is located near Boston, Massachusetts. Your general contractor has offered two options for wall construction. you choose? Why? Show your work. Which one do You should start by calculating the R-value for each option (use the tables that appear on the next page; show your work). Then make your decision and justify it with at least three data/fact-driven points of support (i.e., the "Rule of Three", as discussed in class). Do not base your decision solely on price -you need to consider all of the features of the wall system, including R-value, cost/square foot, aesthetics, and the wall's functional performance, particularly considering the weather and other local conditions in Boston. The ASHRAE R-value table is posted along with this assignment in WebCampus. (30 points) Option 1: Brick veneer siding Cost per square foot, installed: $25.35 Exterior walls will be constructed using the following Brick, 4" thick Insulation board: expanded perlite, organic bonded, 1.5* thick Tyvek vapor-seal plastic film building membrane Particleboard, low density, 1/2" thick Metal studs (metal structural members): 2" x4", spaced 16" o.c. (on center) Cavity insulation -glass fiber, spray-applied, approximately 4 thick Gypsum board-3/8" thick Vinyl wallcover (i.e., wallpaper) Option 2: Cedar shingle siding Cost per square foot: $9.36 Exterior walls will be constructed using the following: Cedar shingles Tyvek vapor-seal plastic film building membrane Insulation - extruded polystyrene (EPS) board, approximately 1.5* thick Particleboard, high-density, 5/8" thick Wood studs (wood structural members): 2 x4", spaced 16" o.c. Cavity insulation: mineral fiber blanket, 3.5" thick Gypsum board-3/8" thick Vinyl wallcover (i.e., wallpaper)Explanation / Answer
Option 1
Brick - 0.12 * 4 = 0.48
Insulation board - 2.78 * 1.5 = 4.17
Vapour seal plastic = 0
particle board low density= 1.41 * 0.5 = 0.705
Metal studs = 0
cavity insulation, glass fibre spray applied= 3.85 * 4 = 15.4
Gypsum board = 0.9 * 3/8 = 0.3375
vinyl wallcover = 0.06
Total R value = 20.6725
Option 2:
cedar shingles - 0.87
Vapour seal plastic = 0
Extruded polystyrene = 5* 1.5= 7.5
particle board high density= 0.85
wood studs - 0
mineral fibre blanket , 3.5 = 13
Gypsum board = 0.9 * 3/8 = 0.3375
vinyl wallcover = 0.06
Total R value = 22.6175
Decision: option 2: cedar shingles
Reasons:
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