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Old 11-09-2010, 10:45 AM
 
136 posts, read 561,193 times
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Hi-

I am trying to figure out the best solution for insulating an open loft space. It currently has no ceiling so the space goes all the way to the roof. We are trying to reduce the amount of space we heat and cool.

1) We are placing barn tin on the rafters. There will be between 2 feet and 3 feet of space between the tin and the roof.

2) The space is about 6,000 square feet.

3) We plan on just laying roll out insulation on the tin.

4) The dilemma is whether R13 will provide enough insulation or if I should buck it up and go with the R30. The costs difference is about 1300 vs. 4,000 so very significant.

I just don't know if I will see enough savings by putting in R30 vs. R13 to justify the difference in price.

Location is KS so fairly cold winters and very hot summers.

Thanks!
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Old 11-09-2010, 01:44 PM
 
Location: Johns Creek, GA
16,634 posts, read 61,390,711 times
Reputation: 21719
Even R30 is below the recommended R value for attics/cathedral ceilings for your neck-of-the-woods.
In the attached pdf link is good solid information for all insulating purposes. On page thirteen is a map of the continental US showing recommended values for the different regions of the country.

http://www.naima.org/pages/resources.../pdf/BI402.PDF

You could get more insulating value out of foam for less density- but, obviously that not an issue for you. And the cost is dramatically more.
Also, depending on how the ceiling is installed there is the possibility of blowing loose fill instead of using batt material.
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Old 11-09-2010, 02:15 PM
 
Location: Austin, TX
16,787 posts, read 46,820,112 times
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Insulation is the best investment you can make, it will pay for it self fairly quickly in lower heating bills, especially if you are heating with electricity. You will still get the payback with gas but since it is cheaper it will take longer. Energy prices are going to keep going up, so you can expect those costs to be considerably higher in the future. 30-40% of a structure's heat loss is thru the roof.

Here is an example on the DOE website where adding 3.5" of insulation to a house with gas heat would pay for it self in 5.67 years.

Energy Savers: Estimating the Payback Period of Additional Insulation
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Old 11-09-2010, 05:14 PM
 
136 posts, read 561,193 times
Reputation: 62
Thanks! The payback calculation was exactly what I was looking for. Also, I did end up finding some less expensive R30 at Lowes so it will be closer to only $1,000 more vs. 2500.
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Old 11-09-2010, 11:23 PM
 
29,984 posts, read 41,472,934 times
Reputation: 12817
Have you looked into other insulation product alternatives?

I'm seeing this used in both commercial and residential. While not inexpensive it includes a mylar reflective thermal barrier.

P2000 is a System (http://p2000insulation.com/index.php/component/content/article/47 - broken link)
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