Guestimate on how much we'd save?

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Old 02-18-09, 06:01 AM
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Guestimate on how much we'd save?

Have a 2 story colonial in Cleveland Ohio. Approximately 1900 sq feet. Attic is 950ish sq feet. Already has 3 inches of loose, 8 inches of unfaced batts. Around 30 R value from what I've read.

Any guestimates on how much we'll save in energy bills if we add another 30r taking it to 60?

1% 3% 6% more?
 
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Old 02-18-09, 06:27 AM
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Hi David, sorry not as easy as that . The simple answer is you will reduce your heat loss through the ceiling by 50%. But we donít know how much your ceiling loss is relative to the rest of the house. Here is a web site where you can play with the numbers to estimate your savings.

Home Heat Loss Calculator

Have fun
Bud
 
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Old 02-19-09, 01:13 AM
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Originally Posted by David_pctech View Post
Have a 2 story colonial in Cleveland Ohio. Approximately 1900 sq feet. Attic is 950ish sq feet. Already has 3 inches of loose, 8 inches of unfaced batts. Around 30 R value from what I've read.

Any guestimates on how much we'll save in energy bills if we add another 30r taking it to 60?

1% 3% 6% more?
The heat is gonna escape somewhere. The only reason we insulate roofs more than walls is to protect the roof from damning,frost,expansion ect. You'll save very little money if you already have r 30 up there. Buy new windows and seal drafts if you want to save on heating.
 
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Old 02-19-09, 05:47 PM
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energy

More to it then just adding insulation.R values vary across the country but here in mn R50 is the level we aim for on attic retro fits. 1st thing is to add attic chutes(plastic) to perimeter of eve with some rolled insulation tucked underneath so you don't block air flow when you add the insulation.*important*
then you need to seal the bypasses with closed cell foam ie--
holes around bathroom fans - vent stacks or any other openings.These are important because of the warm moisture laden air that is forced through with the pressure inside the home.(Often causing frost problems in cold climates)Also you should glue polystyrene sheets to your access hatch and then cover with rolled insulation when job is complete( If it is located in your house and not the garage)also make sure all fans are vented outside.The problem with rolled insulation is that air escapes through all of the cracks on the sides - 3" of blown on top is hardly going to stop that.Adding another 8-12"
of blown fiberglass on top will be your best bet.With all this work your FURNACE AND A/C will cycle less saving energy and wear and tear on the equipment.Percentage of energy will be better but can't put an exact # .remember now there will be a 30% rebate on the new stimulus. I am a ins contractor in minneapolis and deal with this stuff quite a bit and it is worth your while so good luck.
 
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