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Best method for installing radiant slab heat - Needed Buddy 04-03-2007
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Posted by Glenn on April 3, 2007, 5:53 pm


>
>>I keep seeing this expression floating slab. It's a term not
>>familiar to me. Do you mean a reinforced suspended slab or
>>maybe one on the ground and subject to raising and falling an
>>inch or so each season? Confess I have never seen concrete
>>float.
>
> http://tinyurl.com/ywmh93
>
> Happens all the time.
> --
>
>
> MichaelB
> www.michaelbulatovich.ca
>
>


Posted by marson on April 3, 2007, 6:25 pm
>
>
>
>
>
>
> >>I keep seeing this expression floating slab. It's a term not
> >>familiar to me. Do you mean a reinforced suspended slab or
> >>maybe one on the ground and subject to raising and falling an
> >>inch or so each season? Confess I have never seen concrete
> >>float.
>
> >http://tinyurl.com/ywmh93
>
> > Happens all the time.
> > --
>
> > MichaelB
> >www.michaelbulatovich.ca

"floating slab" must be a regional term. It's a slab with a deepened
and reinforced perimeter but which does not have frost footings.

Back to the original question, we lay down a layer of 6 mil poly, then
a layer of 2" extruded polystyrene. Then the tubes get stapled to the
foam with special staples. We don't usually use rebar in the field of
a residential slab--since it is usually covered with finish flooring
of some kind, a few cracks which don't involve substantial
displacement are no big deal. In this case, we put the perimeter
rebar in, and then the tubes which can be tied to the perimeter
rebar.


Posted by Steve Barker on April 3, 2007, 2:17 pm
To answer your original question (which none of the replies have), here are
some links. I put tubing in my 30 x 40 and used (5) 300 foot circuits.

http://www.radiantcompany.com/details/grade.shtml

http://www.ccallis.com/bubble___foil_insulation.htm

http://www.radiantcompany.com/

http://www.teksupply.com/webapp/wcs/stores/servlet/CategoryDisplay?catalogId=10053&storeId=10001&categoryId=34956&langId=-1&division=TekSupply&top=Y&parent_category_rn=34956&top_category=34956&breadcrumb_trail=TekFoil+Reflective+Foil+Insulation&breadcrumb_categoryIds=34956&mediacode=H2

http://www.trendsetterindustries.com/radfloorheating.html

--
Steve Barker



> I'm putting a small extension on our home and wood like to use radiant
> heat in a floating slab and need some good directions on how to proceed. I
> have seen some jobs when they were finished, but need to know more about
> the insulation going under/in the slab and anything else helpful.
>
> Are there any good sites with pictures detailing the process?
> TIA
> --
>
> ><<XX>:> Buddy



Posted by Buddy on April 4, 2007, 10:20 am
Steve Barker wrote:
> To answer your original question (which none of the replies have), here are
> some links. I put tubing in my 30 x 40 and used (5) 300 foot circuits.
>
> http://www.radiantcompany.com/details/grade.shtml
>
> http://www.ccallis.com/bubble___foil_insulation.htm
>
> http://www.radiantcompany.com/
>
>
http://www.teksupply.com/webapp/wcs/stores/servlet/CategoryDisplay?catalogId=10053&storeId=10001&categoryId=34956&langId=-1&division=TekSupply&top=Y&parent_category_rn=34956&top_category=34956&breadcrumb_trail=TekFoil+Reflective+Foil+Insulation&breadcrumb_categoryIds=34956&mediacode=H2
>
> http://www.trendsetterindustries.com/radfloorheating.html
>
Thanks Steve - especially that first link, it's a real primer. (sorry
for the direct post)

--

><<XX>:> Buddy

Posted by Steve Barker on April 3, 2007, 2:22 pm
I must add in that mine has 1/2" rebar in both directions on 2' centers and
was poured very wet. This is because it was poured last INSIDE the already
constructed building and I DO have one crack already. It was poured the day
after thanksgiving '06. I do feel, however, if I had been on top of things,
and had my heat source ready to heat the floor, it wouldn't have cracked.
It is cracked across one corner about 3' in each direction from the corner.
I believe this is 100% due to frost heave and wouldn't have happened, like I
said, if it had been heated. If winter is coming when you pour, be ready
with the rest of your system, and I don't believe you'll ever crack
regardless of the concrete consistency when poured.

Just my observations and opinions.

YMMV.

--
Steve Barker




> I'm putting a small extension on our home and wood like to use radiant
> heat in a floating slab and need some good directions on how to proceed. I
> have seen some jobs when they were finished, but need to know more about
> the insulation going under/in the slab and anything else helpful.
>
> Are there any good sites with pictures detailing the process?
> TIA
> --
>
> ><<XX>:> Buddy



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