Insulation R-Values

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Insulation R-Values

Postby mikeschn » Thu Aug 26, 2004 6:19 am

Here's a chart I found on the web. Hope it helps someone! :)


Insulation Type R-Value per inch of thickness
--------------------------------------------- ----------------
Fiber glass blanket or batt 3.2
High-performance fiber glass blanket or batt 3.8
Loose-fill fiber glass 2.5
Loose-fill rock wool 2.8
Loose-fill cellulose 3.5
Perlite or vermiculite 2.7
Expanded polystyrene board 3.8
Extruded polystyrene board 4.8
Polyisocyanurate board, unfaced 5.8
Polyisocyanurate board, foil-faced 7.0
Spray polyurethane foam 5.9
Polyicynene spray in foam insulation 3.8

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Postby denverd0n » Thu Aug 26, 2004 10:52 am

Great list! I guess I'm going to have to check out polyisocyanurate board. Is there a brand or generic name that it's sold under?
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Postby tom » Thu Aug 26, 2004 9:18 pm

Correct me if I'm wrong...at least for the glass insulation...those R-values should be based on a 1" dead air space between the face of the insulation and the back of the inside wall. Most manufacturers negate any stated R-value if that dead air space is compromised.
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Postby Steve Frederick » Thu Aug 26, 2004 10:19 pm

denverd0n wrote:Great list! I guess I'm going to have to check out polyisocyanurate board. Is there a brand or generic name that it's sold under?

Look for R-Max, or Tuff-R. The stuff is a yellow/tan foam with foil on each side. Home Depot stocks it here in NY. Will bend if you kerf the inside of the curve.
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Postby Eagle » Sun Sep 12, 2004 11:58 am

http://coloradoenergy.org/procorner/stuff/r-values.htm

This site may be of interest.

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Postby Arne » Sun Sep 12, 2004 5:42 pm

Steve, what do you mean kerf the inside? Like cut a V and remove material so it will bend?

I ask because I'm getting ready to do the curved protion with 3/4" High-R... and was going to cut slits on the outside of the curve.... The joists will be 1 inch thick.

btw, I have my 2 walls up, glued in place, wired for fans and lights... pic is in my album.. tomorrow, I'll start the front wall and ceiling....
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Postby mikeschn » Sun Sep 12, 2004 5:48 pm

Arne,

I kerfed my insulation... it simply means to run a saw blade halfway into the insulation every 1/4" or so...

Here's a rough photo of my kerfing...
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