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Originally Posted by Pearlbluebird
Here's a question for you guys.
What would give the best benifit for keeping the house warmer ?
The same house already has 4" R12 in the attic. Basement is not insulated.
a) Bump the attic insulation to R50
b) Seal header cavity and insulate foundation walls to R12.
Both will have benefits but one is the better choice.
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In a typical "tract" house neither one is all that important when compared to infiltration. Infiltration is the biggest heat loss in the USA.
I wish they would do a pressurized check of the houses built here as I have read about in Canada. Would get rid of a bunch of hack builders. In the study I read the average house in Canada has a hole the equivalent size of a basketball. The average American house has a hole the size of an 8x8 garage door!
Don't believe all the bs about R Factor, you can have all the insulation you want, makes no difference if the air is traveling around it. I have only 6" of old fiberglass in my attic and my heat bills are never over $70 in the coldest month. Think thermos.....
Bull, you need to keep mold in mind. Do sme research and make sure you are not making a mold colony. Its much easier to grow than it is to get rid of.