On May 25, 11:49*am, Oren wrote:
On Sat, 25 May 2013 07:35:48 -0700 (PDT), "





wrote:
On May 25, 2:11 am, wrote:
On Fri, 24 May 2013 19:04:55 -0700 (PDT), "

wrote:
On May 24, 4:13 pm, Oren wrote:
On Fri, 24 May 2013 15:41:26 -0400, wrote:
On Fri, 24 May 2013 12:38:56 -0700, chaniarts
wrote:

On 5/24/2013 12:22 PM, Oren wrote:
On Fri, 24 May 2013 10:29:58 -0700, chaniarts
wrote:

No, there is no insulation between the pool and the ground. It doesn't get that cold down here for that kind of thing, I would think.

you'd be wrong. ground temp is always less than air temp, unless you're
living on a volcano. so, it's always a heat sink 24x7. insulation around
a pool is always a winner, but it's hard to put in after the pool is done.

I worked in pool construction as a teen, In Florida, no less. Not once
was insulation involved in the construction of the in ground pools.

The cement gunite is ~ 8 inches thick, full of steel rebar and
retains heat for some time.

cost.

yes it retains heat. but the earth is a pretty large heat sink, and
it'll win every time. otherwise ground loops for heating/cooling
exchangers wouldn't be an economic win.

i would bet that every pool north of 5 degrees of latitude would benefit
from insulation, most especially heated ones. no one wants to pay for
that up front.

Heating pools is fairly insignificant in Florida.

I'd go so far as to say the water table is warm. (seasonable)- Hide quoted text -

- Show quoted text -

Well, it certainly is more than 32F, but it is still below what you
would want far a swimming pool for at least 6 months every year. No
matter what, there is going to be a lot of heat loss into the ground,
and the ground is very wet/conductive in FL. You need to study the
air loss from the surface and the conducted loss thru the walls and
bottom of the pool to see where your emphasis should be, It is
conceivable that you should drain the pool, put insulation all around
the sides of the pool and then refill the pool.

Huh?
How do you get the insulation behind the concrete?

That would seem to be a good question

For that matter, if you have a liner based pool, I'm
not sure you could do much with that either. Not sure
what you have behind the liner, ie if there is room for
some kind of insulation, like expanded foam maybe?

A good question is why they don't insulate new pools?
If planned for as part of the construction there could be
room for sufficient insulation. *And while it would add to
the cost, you would think the payback would be pretty
reasonable, assuming you do some amount of pool
heating.

I can't come up with a single idea as to what the insulation would be.

It would have to:

- support the weight of a concrete pool or crack the pool

- last for ages under ground

- how would the water table impact the material

Now, on a casino roof top pool, it would seem there would be an easy
way.- Hide quoted text -

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I agree there are some issues. But then insulation is used
with concrete pours for basements that are going to
be heated. Not all the time, but I've seen it done on TV,
like This Old House, etc. Google ICF concrete.