1. Utilizing the attached "Building Material R-Values" document:

1. Calculate the total R-Value of the wall assembly as shown below (don't forget that there is an invisible film of air on both the interior and exterior of the wall).

1. What individual element of the assembly provides the most thermal resistance?

1. The Residential Prescriptive Requirements in the 2009 International Energy Conservation Code (IECC) require a total minimum R-Value of 13, for a wood framed wall. Would this wall, assuming the R-Values per the Building Material R-Values chart, meet that requirement?

Taped & Painted 5/8" Gyp Board 2" x 6" Wood Studs, 16" O.C. 6" Batt Insulation 4" Brick Veneer 2" Air Space 8" CMUBuilding Material R-Values MATERIAL THICKNESS R-VALUE NOTE: (TOTAL R-VALUE GIVEN, UNLESS OTHERWISE NOTED) Air Films Interior Wall N/A 0.68 Exterior Wall N/A 0.17 Interior Ceiling N/A 0.61 Air Space 1/2" to 2" 1.00 2 1/4" to 4" 2.00 Building Board 2" x 4" wood stud wall @ 24" R= 2.7 per inch of O.C. w Batt Insulation nominal thickness R = 3.2 per inch of 2" x 6" wood stud wall @ 16" nominal thickness O.C. with Batt Insulation2x6 stud wall @ 24" o.c. with Medium Density Spray Foam Insulation (SPF) against exterior sheathing R: 4.1 per inch of nominal thickness Taped & painted 3.13" gypsum NA 0.525 board on inside face of stud Taped & Painted 518" gypsum NA 0.6 board on inside face of stud 033 or Plywood Sheathing NIA 0.62 Fiber board sheathing 11'2" 1.32 Mineral Fiber with 2x4 wood 1244 studs @ 16" OC Mineral Fiber with 2x4 metal 550 studs @ 24" 00 Brick Veneer 4" 0.80 Brick Veneer 6" 1.10 Concrete Masonry Unit (CMU) 4" 0.80 Concrete Masonry Unit (CMU) 8" 1.11 Concrete Masonry Unit (CMU) 12" 1.28 Exterior Cladding on Metal Channels N/A 0.51 and Housewrap Cladding on Furring Strips and N/A 0.61 Housewrap Flooring Hardwood 3/4" 0.68 Tile 0.05 Carpet with fiber pad 2.08 Roofing Asphalt Shingles 0.44 Wood Shingles 0.97 Glazing Single Pane 1/4" 0.91Double Pane with 1/4" air space 1.69 Double Pane with 1/2" air space 2.04 Doors Wood, solid core 1 3/4" 2.17 Insulated metal door 2" 15.00 The values in the table above were taken from a number of sources including: the ASHRAE Handbook of Fundamentals, ColoradoENERGY.org, and Building Construction Illustrated by Francis D.K. Ching. Other minor sources were also used