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12. SqFt U factor U x A <br /> Gross wall area 4363.82 <br /> minus <br /> Window area 411.3966667 0.37 152.22 <br /> Patio door area 82.2 0.37 30.41 <br /> Atrium area 0 0 0 <br /> Rim joist area 247.5 0.029 7.18 <br /> Door area 53.8 0.14 7.53 <br /> Fireplace area 25 0.17 4.25 <br /> Exposed Found. 132.66 0.07 9.29 <br /> * Framing area 436.382 0.095 41.46 <br /> equals <br /> Totals for net wall: 2974.881333 0.043 127.92 <br /> Totals for gross wall area: 380.26 <br /> * Framing area is 10%of gross wall area <br /> 13. Gross wall area x factor below = U x A per code <br /> Factor is .11 for A-1 single family&duplex <br /> .23 for A-2 and other residential <br /> .23 for other buildings <br /> .28 for over 3 stories <br /> Factor is: 0.11 <br /> BTUH = 480.0202 MUST BE > OR = 380.26 <br /> (calculated above) <br /> 14. Gross ceiling area = 1756 <br /> 15. Ceiling framing area (10%of ceiling area) = 175.6 <br /> 16. Joist Area (10%of ceiling area) = 175.6 <br /> 17. Net ceiling area (Gross ceil. area-Joist area) = 1580.4 <br /> 18. U ceiling: 0.021 x Net ceil. area = 33.1884 <br /> 19. U framing: 0.024 x Joist area = 4.2144 <br /> 20. Total of item 18 x item 19 = 37.4028 <br /> 21. Gross ceiling area x factor below = U x A per code <br /> Factor is .026 for A-1 single family&duplex <br /> .033 for A-2 and other residential <br /> .06 for other buildings <br /> Factor is: 0.026 <br /> BTUH = 45.656 MUST BE > OR = 37.4028 <br /> (calculated above) <br />