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#1
04-02-2010, 01:18 PM
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Measuring house square footage
I was looking at a survey plat of a house, and it gives the exterior dimensions of the structure. When it comes to calculating square footage under heat/air, there must be some sort of adjustment for the volume of the walls. I am assuming there is probably some sort of rule of thumb, possibly a percentage factor. Would anybody know what that might be?
thanks Fred
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MB-less 
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#2
04-02-2010, 01:48 PM
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If it's for HVAC loads, you'd have to also factor in doors & windows, insulatioin, and other things like that.
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" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century  OBK #55 1998 Lincoln Continental - Sold Max 1984 300TD 285,000 miles - Sold The Dee8gonator 1987 560SEC 196,000 miles - Sold Orgasmatron - 2006 CLS500 90,000 miles 2002 C320 Wagon 122,000 miles 2016 AMG GTS 12,000 miles
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#3
04-02-2010, 01:52 PM
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I'd just use the dimensions given for a ball park number.
If you are getting serious about it, you need all the dimensions (plus height) and all the window, door sizes and the roof/wall constuction to do heat gain/loss calculation You can go to the DOE website and down load their rescheck program which is very helpful if you are doing insulation.
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95 E300D gave away 77 300D, 227k, station car 83 300CD 370k, body gone away to the rust gods, engine is in a Yota pickup, going strong 89 190E 2.6- 335k, no more 79 VW FI Bus- 154k summer driver 59 VW Beetle ragtop- 175k 12 VW Jetta- 250k 74 MG Midget-78k
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#5
04-02-2010, 05:58 PM
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I think most people go with the outside dimensions of the structure. Seems odd, not entirely accurate but that's what I've encountered.
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Te futueo et caballum tuum 1986 300SDL, 362K 1984 300D, 138K
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#6
04-03-2010, 09:28 AM
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If you are doing calcs for heating/aircon, best use the outside dimensions, its better to be a little over-sized than under-sized. You can always turn a larger aircon down a little. Try turning an undersized one up when its already flat out !!
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort....  1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles  1987 250td 160k miles English import  2001 jeep turbo diesel 130k miles  1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving
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#7
04-04-2010, 09:29 AM
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In a typical home about 2/3 of all heat loss is from leakage around doors and windows and loss from opening and closing doors, so any true calculation needs to calculate in all that.
In most cases though the hvac folks just say....hmmmm, 2800 sf about average windows etc....about 2.5 tons ac and 150K btu heat. (as an example) And it works.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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