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Fireplace area 0 0 0 <br /> Exposed Found. 120 .6 0 .08 9 .65 <br /> * Framing area 246 .996 0 .095 23 .46 <br /> equals <br /> Totals for net wall : 1384 .814 0 .043 59 .55 <br /> Totals for gross wall area: 248 .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 = 271 . 6956 MUST BE > OR = 248 .26 <br /> (calculated above) <br /> 14 . Gross ceiling area = 1732 <br /> 15 . Ceiling framing area (10% of ceiling area) = 173 .2 <br /> 16 . Joist Area (10% of ceiling area) = 173 .2 <br /> 17 . Net ceiling area (Gross ceil . area - Joist area) = 1558 .8 <br /> 18 . U ceiling: 0 .021 x Net ceil . area = 32 .7348 <br /> 19 . U framing: 0 .024 x Joist area = 4 .1568 <br /> 20 . Total of item 18 x item 19 = 36 .8916 <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 .032 MUST BE > OR = 36 .8916 <br /> (calculated above) <br />