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Totals for gross wall area: 521 .78 <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 = 583 .5852 MUST BE > OR = 521 .78 <br /> (calculated above ) <br /> 14 . Gross ceiling area = 2215 <br /> 15 . Ceiling framing area ( 10% of ceiling area ) = 221 .5 <br /> 16 . Joist Area ( 10% of ceiling area ) = 221 .5 <br /> 17 . Net ceiling area (Gross ceil . area - Joist area ) = 1993 .5 <br /> 18 . U ceiling: 0 .021 x Net ceil . area = 41 .8635 <br /> 19 . U framing: 0.024 x Joist area = 5 .316 <br /> 20 • Total of item 18 x item 19 = 47 .1795 <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 = 57.59 MUST BE > OR = 47 .1795 <br /> (calculated above ) <br />