DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Insulation and Radiant Barriers > Is there a maximum R value for insulating




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Old 10-03-2013, 01:59 PM  
jjohnston
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Default 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?



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Old 10-03-2013, 06:26 PM  
nealtw
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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.

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Old 10-23-2013, 04:57 AM  
Perry525
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Default 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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