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Old 01-11-2011, 10:42 AM   #1
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R13 or R19??


My local building code only requires R13 on 2x4 walls. Would it be wasteful to go R18 with the foam sheets. It's also $800 more.

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Old 01-11-2011, 11:32 AM   #2
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R13 or R19??


That is kind of like asking, would leaving the car running over night instead of turning it off make a difference with gas consumption.

What material are you thinking of using to insulate, have you looked at all the options?

You could try buildingsceince.com for insulation methods and materials.

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Old 01-11-2011, 01:54 PM   #3
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R13 or R19??


Clearly the R18 will insulate better, but the question is, is it worth it? Is this for the entire house, or just an extension/new wall? How tight is the rest of the house? Does it leak energy like a sieve or is it really tight? From a financial worth question you've got to ask yourself how long will it take for you to save that extra cost in energy. If you'll save $100 / year is a 8 year payback ok with you? If it's $10/year is an 80 year payback ok? Of course there are other measures of worth, will you sleep better at night knowing you're saving energy?
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Old 01-11-2011, 02:34 PM   #4
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R13 or R19??


Anything over R-13 when placed into a 2x4 stud space will compress down to R-15. Best would be recycled Blue Jeans, or RoxWool, or even WetSpray Mineral, which would be even better than placing Batts of any other insulation. Fiberglass has less insulating & sound deading properties, than Spray in, or recyled bluejeans, roxwool, wetspray Mineral/Roxwool.
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Old 01-11-2011, 02:49 PM   #5
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R13 or R19??


When I have been doing our farm house, the studs are true 2x4's so I have an extra 1/2" of cavity depth. what I did was first put in 1/2" rigid styrofoam for a R0.5 and then R14 Roxul... this works out well and fills the cavity up.

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