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02-06-2007, 02:32 PM   #1
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## Square Feet

I have a room I need to insultate. It is 40x30. How do I figure out how many square feet I need?

02-06-2007, 02:45 PM   #2
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Take the exterior walls, say that one 40' and one 30' wall are exterior. That is 70'. Multiply that by the wall height for the required SqFt of insulation.

 02-06-2007, 03:12 PM #3 Member     Join Date: Oct 2006 Location: Minneapolis/St. Paul, Minnesota - Latitude 45.057 Longitude -93.074 Posts: 4,080 Rewards Points: 2,650 For the ceiling you need 1200 square feet. If did that without taking off my shoes and counting on my square feet - LOL!

02-06-2007, 05:02 PM   #4
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## Square Feet

if I take 40 +30 =70 x 10 feet high walls that would be 700 sq. wouldnt i need 1400 sq to cover the whole room?

 02-06-2007, 05:39 PM #5 Member   Join Date: Jan 2007 Posts: 221 Rewards Points: 150 you got it... sqft area = length * height of each surface, just add 'em up. 1400 sqft for the walls 1200 sqft for the ceiling (if needed)
 02-06-2007, 09:37 PM #6 Member   Join Date: Mar 2006 Location: Austin, TX Posts: 1,605 Rewards Points: 1,232 You only need to insulate the exterior walls. If they are all exterior walls, you don't have a room, you have a house.
02-07-2007, 11:45 AM   #7
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Square Feet = Height' (or Length') X Width' X Toes and all insulation vapor barrier goes toward heated space.
Mike

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