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philbee62 08-04-2010 10:27 PM

insulation types i can use between current and new sheetrock on ceiling
I have 1978 ranch home with a great room, which I am remodeling.

Currently, there is the sheetrock ceiling nailed to the ceiling joists. There is an R13 Owens Corning insulation layer on top of that between the joists and then the roof decking is nailed on top of the joists.

To install can lights, I currently do not have enough depth between the sheetrock and roof decking (there is no free space!). So, my remodeler is going to put fir strips on the current ceiling (nailed to the existing studs)and then he will put new sheetrock over these fir strips and finish it.

Since I currently have such poor insulation, I am thinking I'd like to sandwich a type of insulation between the existing sheetrock and new sheetrock.

I think these are my insulating options given the above:
1) I can use foam board insulation between the fir strips - this product has an R-3 value (not very good!)

2) I can use a radiant barrier material. This doesnt improve the R-value, however, it does cause heat reflection/reduction.

3) anyone have other ideas / options?

I am liking Option 2 because the material is light weight, relatively inexpensive, easy to install and acts as a radiant barrier.

If I go with this option, are there any "cons" to this solution? The only con I can possibly think of is potential water vapor build up between the two layers of sheetrock and radiant barrier, but I am not sure if that is true.

Thanks for any advice on this or other ideas!

racebum 08-05-2010 04:00 PM

how many inches do you have to work with? most ranch homes slope so you have maybe 8ft in the middle of the house down to a couple inches as you work toward the front and back wall.

you can get a 30% tax credit if there is any way to blow in and get thick enough to hit R38 {for most the country}

i was just wondering where you're so short that cans won't fit

Scuba_Dave 08-05-2010 06:02 PM

Any insulation is eligible for the 30% tax credit thru the end of 2010
Not just blown in

racebum 08-05-2010 07:15 PM


Originally Posted by Scuba_Dave (Post 481002)
Any insulation is eligible for the 30% tax credit thru the end of 2010
Not just blown in

i thought it had to meet current R energy efficient standard? {why i mentioned r38 in the attic}

which seemed odd since there is no way to verify if you really meet R on something like a blow in job. i was actually going to call the IRS to ask unless you're certain any insulation qualifies. if so i can just file all my receipts at the end of the year.

Scuba_Dave 08-05-2010 08:12 PM

Installation costs not included in Tax credit



Typical bulk insulation products can qualify, such as batts, rolls, blow-in fibers, rigid boards, expanding spray, and pour-in-place.

Products that air seal (reduce air leaks) can also qualify, as long as they come with a Manufacturers Certification Statement, including:
  • Weather stripping
  • Spray foam in a can, designed to air seal
  • Caulk designed to air seal
  • House wrap

To qualify:


For insulation to qualify, its primary purpose must be to insulate
possible they snuck the requirement in somewhere else

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