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Old 12-27-2017, 01:01 PM   #16
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Re: R13 to R21 wall upgrade


the builder probably knows what to do to reach minimum code levels. u don't have to worry too much.
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Old 12-27-2017, 02:39 PM   #17
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Re: R13 to R21 wall upgrade


Our code calls for 2x6 for exterior walls.
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Old 12-27-2017, 06:16 PM   #18
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Re: R13 to R21 wall upgrade


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Originally Posted by user_12345a View Post
So it's a 2x6 house then?

you won't notice a big difference between R19 and R21.

The effective r-value is well under the rating because the studs cause thermal bridging and you also have air movement.
yes 2x6 walls.
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Old 12-27-2017, 06:46 PM   #19
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Re: R13 to R21 wall upgrade


Where I am two bye six walls are required regardless of what goes inside. Ron
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Old 12-28-2017, 01:37 PM   #20
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Re: R13 to R21 wall upgrade


builder wants $1200 to upgrade from R19 to R21. Not sure if i will be able to tell if i would be more comfortable with just 2 R-values difference for $1200. based on the insulation upgrade cost savings calculator by build it solar i would see payback in over 10 years, save $53 a year.
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Old 12-28-2017, 02:02 PM   #21
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Re: R13 to R21 wall upgrade


I guess you have lost me 2Quicker. We started out with 2x4 walls and r-13 which seriously does not meet building codes and now he is supposedly looking for $1,200 more for this small upgrade, which I already explained may already be required. If code is r-20 he cannot meet that with r-19, code applies to cavity only. Find out what your local code officer wants and go from there.

As far as adding more insulation to improve comfort it was already posted you will not feel the difference. As for return on investment there are many other places you should be far more worried about that will have a quicker return on your cost.

Make the builder give you a quote based upon what the inspector will accept as minimum. Then you can put that $1,200 any place you want.

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Old 12-28-2017, 02:07 PM   #22
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Re: R13 to R21 wall upgrade


ya, that's not a big enough difference to improve comfort when you already have r-19. Probably a 1 to 3% savings on the heating bill. whether to do it or not, it's up to you, you're stuck with whatever wall insulation they put, can't go back.

there is confusion with respect to codes and even the type of construction. like if it's on a slab or basement, if air ducts are going in the attic or what?
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Old 12-28-2017, 02:47 PM   #23
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Re: R13 to R21 wall upgrade


Sorry everyone. the house will be 2x6 walls. When i asked the builders rep about what type of insulation is used in the walls they told me R13 so that's why i asked about R13 to R21. After reading some energy codes i realized that wasn't right so i ask to verify with the building manager and they said they use R19 insulation.

I am having the builder move the furnace form the attic to the garage, ducts works will be in crawl space. Going with a Carrier comfort 59scd 95% Gas/propane and upgrading the windows from .35 to .28 u-factor.
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Old 12-28-2017, 03:22 PM   #24
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Re: R13 to R21 wall upgrade


Very good.

I hope they're doing your crawlspace as a mini-basement, with a concrete floor, insulated walls.

Doing it ventilated with insulation in the floor isn't as good, results in more energy loss especially with ducts down there.
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