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# Closed cell pipe insulation R-value ( s milne)

Member Posts: 199
Scott.

http://www.nomacokflex.com/pdfs/thermacel/therma-cel%20Pipe.pdf

hth, db

• Member Posts: 5,884

tell a contrator that the closed cell black rubber pipe insualtion that we installed had 0 R-Value !!

If I'm wrong - I'm wrong, but that would mean that all the pipes that I protected with, what I thought was insulation, were NOT protected ????

I can't find a website with R-values. Any one ??

Scott

• Member Posts: 1,405
According to the Grainger catalog...

Page 3421 (#395 version), there's a table of Therma-Cel brand PE closed cell showing varying R-values based on wall thickness and pipe diameter.

They show 3/8, 1/2 and 3/4" wall thicknesses for 1/2" copper tube thru 1-1/4" as being from the lowest R of 1.8 to 5.7.

Tell the plumbing inspector he owes you a beer or one helluva good excuse as to how he got that dumb. His choice(;-o)

• Member Posts: 45
• Member Posts: 45
Pipe insulation r values

Check this out:
• Member Posts: 45
• Member Posts: 2,398
Arrrrrr Matey!

The k factor (for Conductivity, engineers can't spell) for Armaflex type insulations is between 0.22 and 0.27 while by comparison, moulded fiberglass is between 0.24 and 0.27.

k factors are analogous to u-factors so the represented R values would be all within the 3.7 to 4.55 range.

Functionally, we accept these as equivalent for equal thicknesses of either material although the Armaflex types have better vapor resistance.

If Armaflex types have zero R value then neither does fiberglass. I bet the building inspector will next tell you that Santa Claus is a myth, the brute.
"If you do not know the answer, say, "I do not know the answer", and you will be correct!"

• Member Posts: 5,884
Thanks Guys

I can imagine some people. This sounds more like something thing Dave would come across. Most of our inspecters are pretty good.

Scott