[Greenbuilding] [BULK] Re: PEX tubing

[Thomas Lewis]

I have not observed pex cracking slabs.  
I believe I've fallen into the trap of repeating what
I've learned from others.  
This information has been given to me as reason for
using pex-al-pex.  The rational being that the alum in
it will reduce the amount of expansion in the pex
tubing (from thermal flux not pressure).  

My comment was meant to point out that pex used for
running plumbing in cavities shouldn't be used for
radiant in a slab. 

as to rush's comment about my post "It also shows a
real lack of comprehension of how systems interact.."
he may be right.  
While I am constantly trying to put pieces of the
puzzle together, I am passing along information that I
have learned that makes sense to me.  Is this
irresponsible?  What the hell, I'm trying.

tl



 
--- Lawrence Lile <LLile at projsolco.com> wrote:

> 
> 
> 
> >the expansion and contraction of the pex could
> crack
> the slab.
> 
> Have you actually observed PEX cracking slabs? 
> Radiant floor in slab
> has been a standard construction technique for
> dozens of years.  
> 
> Radiant floor companies sell a special tubing for
> this application, it
> has an extra layer of plastic on the outside of the
> PEX.  They also sell
> a tubing called PEX-Al-PEX, which is two layers of
> polyethylene
> sandwiching a layer of aluminum.  This should last
> longer than the
> already long-lasting two layer tubing.  The tubing
> comes in long rolls
> to minimize joints under the slab.  
> 
> I would not recommend using hardware store tubing. 
> 
> --Lawrence Lile 
> 
> 
> 
> 
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"Time makes more converts than reason."  Thomas Paine, Common Sense


 
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