Closed cell pipe insulation R-value ( s milne)

don_52

Scott.

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

hth, db

ScottMP

I had a Plumbing Inspector

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

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Dave_4

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)

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HitzKup_2

R values

Check this out: http://www.armacell.com/www/armacell/armacell.nsf/ansHTMLSeitenLookUp/US_Frame?OpenDocument&Link=http://www.armacell.com/www/armacell/armacell.nsf/Title/US05Info-ServiceBulletins(00)

HitzKup_2

Pipe insulation r values

Check this out:

HitzKup_2

Pipe insulation r values

Check this out:

http://www.armacell.com/www/armacell/armacell.nsf/ansHTMLSeitenLookUp/US_Frame?OpenDocument&Link=http://www.armacell.com/www/armacell/armacell.nsf/Title/US05Info-ServiceBulletins(00)

Brad White

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.

ScottMP

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

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Dave Yates (GrandPAH)_8

Hey!

I resemble that remark ;-)