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-   Insulation and Radiant Barriers (http://www.houserepairtalk.com/f106/)
-   -   Is there a maximum R value for insulating (http://www.houserepairtalk.com/f106/there-maximum-r-value-insulating-16603/)

jjohnston 10-03-2013 01:59 PM

Is there a maximum R value for insulating
 
I have been looking around. I see that code for my area requires an R of 49 for ceiling and 19 for walls. I am just curious. Is there a maximum? If I have an R49 currently, could I bump it to R80, or R100? or is R60 really as high as you want to go?

And if there is a max, what is the reason? would it cause to much moisture, etc?

nealtw 10-03-2013 06:26 PM

You have to look at cost benifit and keep in mind a really good double glased window will have an R value of 5 or 6 if you are lucky.

Perry525 10-23-2013 04:57 AM

Maximum insulation.
 
It rather depends on where you live.
In the very coldest places 10 inches of polystyrene, more than that and you cannot measure any improvement.


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