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what R insulation to use in a basement ceiling

Posted by chickadee4 (My Page) on
Wed, Mar 6, 13 at 15:34

we live in the Ct/Mass/Ny border so winters are cold.
I deduced that the insulation to the basement ceiling is the reason why the above room is always cold. I have had the HVAC people look at the vents and blower to this room.
As we surveyed the basement ceiling I could see substrate, missing insulation and areas where the insulation has a huge gap between it and the substrate.
The insulation gentleman says that I need to replace the R11 with at least an R 19.
Would it be better to do a R 25/30 or just install the R 19 product. This part of the basement has no heat, three walls of concrete and two small basement windows..
The present insulation does not sit flush with the substrate. When I walk in socks on the above room which has a wood floor the floor is cold.
So Do I install a higher R factor or go with the R 19
The installer says it will cost a dollar a sq foot to increase the R factor. I am looking at 1100 sq ft .
R 19 would cost 2800 so an R 25/30 would cost 3900
Thank you in advance


Follow-Up Postings:

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RE: what R insulation to use in a basement ceiling

More R, of course, means slower heat loss, as does an intact insulation system. I'd go with R30.
Is it within your budget to put in radient floor heat?


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RE: what R insulation to use in a basement ceiling

How is the basement going to be heated?

Any water lines down there?


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RE: what R insulation to use in a basement ceiling

There is a rule in insulation application; The vapor barrier faces the conditioned space.
If the comfort heating appliance is in the basement, there should be a register someplace in the ducting to maintain some level ambient heat.

Were I you, I would fill in the gaps with a similar faced product and add unfaced R-19to the joist bays, add storm windows too the windows and make adjustments to the ambient heating source.
This is about a day and a half for a DIY.


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RE: what R insulation to use in a basement ceiling

deleted double post

This post was edited by chickadee4 on Tue, Mar 12, 13 at 13:15


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RE: what R insulation to use in a basement ceiling

You are good!!!
Never considered installing radiant heat .
I did googled R factor for my zone and nothing appeared in my web searches.
I did find a website saying that crawl spaces and basement ceilings should have R19 when I googled is it dangerous to install fiberglass. A DIY website explained the R factors for each time zone . Code for this ceiling is now R19 . I agree that R 25 is a better choice.

I am not heating this side of the basement. The basement is already divided in three sections with the other two having sheet rock. The side I am having issues with is cold in the above room
I have a cold room and was trying to figure out if this space needed the ducts turned off or maybe the duct was blocked.
I pulled back the insulation and there is no kraft paper/there is no vapor barrier.

This is a simple DIY with googles, mask and long sleeves but I weigh under a buck and for my size am getting so tired of handling all the repairs. I am a handywoman deadly with my vice grips.
Not planning on using this side of the basement , just want to contain the heat and block the cold.
I will rip out the old insulation since there is no vapor barrier, install R25 and reuse the R11 over it.
Appreciate your opinions.TY
Please chime in if reusing the R11 is a bad idea. I would apply a vapor barrier R25 and leave the R11 over this.


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RE: what R insulation to use in a basement ceiling

If the existing product is faced, the facing is the vapor barrier and that is why I suggested filling in the voids and adding the unfaced R-19, equaling R-30.

Often these sites, when speaking about the old insulation, are considering other circumstance than in a basement where the product does not suffer the lose of its ability to retain air, caused by compression.

While I would use the raw, unfaced product, there is an encapsulated product which reduces the fiber exposure, however, because the loose product tends to lend itself to retention in place, the encapsulated will require some ty-wire to facilitate that.


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RE: what R insulation to use in a basement ceiling

There is no vapor barrier/no paper/no kraft paper.
What i have is R11 held by stringers.
I found a website that says in my zone R 19 is needed.
I plan on removing the old R 11 since there in no paper.
I will install R 25 and reuse the R11 .


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