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equals <br /> Totals for net wall: 1878.666667 0.043 80.78 <br /> Totals for gross wall area: 234.62 <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 = 311.135 MUST BE > OR = 234.62 <br /> (calculated above) <br /> 14. Gross ceiling area = 816.25 <br /> 15. Ceiling framing area (10$ of ceiling area) = 81.625 <br /> 16. Joist Area (10� of ceiling area) = 81.625 <br /> 17. Net ceiling area (Gross ceil. area - Joist area) = 734.625 <br /> 18. U ceiling: 0.021 x Net ceil. area = 15.427125 <br /> 19. U framing: 0.024 x Joist area = 1.959 <br /> 20. Total of item 18 x item 19 = 17.386125 <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 = 21.2225 MUST BE > OR = 17.386125 <br /> (calculated above) <br />