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Maximum Window U-value with 90% AFUE space heating and R-10 Foundation Wall Insulation Max.Total Window and Door Area as a percent of exposed wall 10% 12% 14% 16% 18% 20% 22% 24% 26% 1 28% ` Wnl1 Type: 2x4,R-13 insulation, <R-5 sheathing 0.37 0.37 0.33 0.28 0.25 1 0.22 0.20 0.18 0.17 0.15 Tx-4,R-13 insulation, >R-5 sheathing 0.37 0.37 0.37 0.37 0.37 1 0. 3 0.30 0.27 0.25 0.23 2x4,R-13 insulation, >R-7 sheathing 0.37 0.37 0.37 0.37 0.37 0.36 0.33 0.30 0.27 0.25 2x6,R-19 Insulation, <R-5 sheathing 0.37 0.37 0.37 0.37 0.36 0.32 0.2.9 0.27 0.24 0.23 2x6,R-19 insulation, >R-5 sheathing 0.37 0.37 0.37 0.37 0.37 0.39 0.35 0.32 0.2.9 0.27 2x6,R-21 insulation, <R-5 sheathing 0.37 0.37 0.37 0.37 0.37 0.35 0.31 0.29 0.26 0.24 2x6,R-21 insulation, >R-5 sheathing 0.37 0.37 0.37 0.37 0.37 0.37 0.36 j 0.33 1 0.30 1 0.28 Maximum Window U-value with 90% AFUE space heating and R-5 up to R-10 Exterior Foundation Wall Insulation Max. Total Window and Door Area as a percent of exposed wall 10% 12% 14% 16% 18% 20% 22% 24% 26% 280% Wall Type: 254,R-13 insulation, <R-5 sheathing 0.37 0.36 0.30 0.26 0.2%", 0.20 0.18 0.16 0.15 0.14 2x4,R-13 insulation, >R-5 sheathing 0.37 0.37 1 0.37 0.37 0.35 0.31 0.28 0.25 0.23 0.22 2x4,R-13 insulation, >R-7 sheathing 0.37 0.37 0.37 0.37 0.37 0.34 0.31 0.28 0.26 0.24 2x6,R-19 insulation, <R-5 sheathing 0.37 0.37 0.37 0.37 0.34 0.31 0.28 0.25 0.23 0.21 2x6,R-19 insulation, >R-5 sheathing 0.37 0.37 0.37 0.37 0.37 0.37 0.33 0.30 0.28 0.26 2x6,R-21 insulation, <R-5 sheathing 0.37 1 0.37 0.37 0.37 0.37 0.33 0.30 0.27 0.25 0.23 2x6,R-21 insulation, >R-5 sheathing 0.37 0.37 1 0.37 0.37 0.37 0.37 0.35 0.31 0.257177.2-77 Maximum Window U-value with 90% AFUE space heating and R-19 or qreater foundation wall insulation Max. Total Window and Door Area as a percent of exposed wall 10% 12% 14% 16% 18% 1 20% 22% 240,46 26% 28% Wall Type: 2x4,R-13 insulation, <R-5 sheathing 0.37 0.37 0.34 0.29 0.26 0.23 0.21 0.19 0.17 0.16 2x4,R-13 insulation, >R-5 sheathing 0.37 0.37 0.37 0.37 0.37 0.34 0.31 0.28 0.26 0.24 2x4,R-13 insulation, >R-7 sheathing 0.37 0.37 0.37 0.37 0.37 0.37 0.34 0.31 0.28 0.24 2x6,R-19 insulation, <R-5 sheathing 0.37 0.37 0.37 0.37 0.37 0.34 0.30 0.28 0.25 0.23 2x6,R-19 insulation, >R-5 sheathing 0.37 0.37 0.37 0.37 0.37 0.37 0.36 0.33 0.30 0.28 2x6,R-21 insulation, <R-5 sheathing 0.37 0.37 0.37 0.37 0.37 0.36 0.32 0.29 0.27 0.25 2x6,R-21 insulation, >R-5 sheathing 1 0.37 0.37 0.37 1 0.37 0.37 0.37 0.37 0.34 0.31 0.29 This is a summary only. Othcr requirements may,ipply. See the Minnesota Energy Code. / Questions? Call Department of Public Service Information Ccnter at 651 296 5175 or R00 657 3710. I page,i