[Jimi]

Hello,

I have bought a garage package (24ft x 30 ft) and plan on putting " in
floor" heat in the concrete pad. I have googled and done several searches
looking for a photo or any hand drawn examples of how to lay the pex pipe
prior to pouring the concrete. I would like to know how to determine the
diameter of pipe to lay...how far apart to lay the pipes ...how many grids
are needed?. This is a simple heated garage...very basic, but can't find any
schematic for laying this pipe....Thanks for any help on this... Jim

[Joseph Meehan]

Jimi wrote:
Hello,

I have bought a garage package (24ft x 30 ft) and plan on
putting " in floor" heat in the concrete pad. I have googled and
done several searches looking for a photo or any hand drawn examples
of how to lay the pex pipe prior to pouring the concrete. I would
like to know how to determine the diameter of pipe to lay...how far
apart to lay the pipes ...how many grids are needed?. This is a
simple heated garage...very basic, but can't find any schematic for
laying this pipe....Thanks for any help on this... Jim

Assuming you will not be spending a great deal of time in the garage,
have you considered the high cost of heating it? You have two choices, one
is to keep the heat on and the other is to heat on demand.

Full time heat is likely to end up very expensive. Do you need that?

On demand heat would be a problem with in floor heat since that concrete
floor must be heated before the garage starts to heat. You end up spending
almost as much as full time heat without the benefits and with a serious
delay between the time you call for heat and it is delivered.

Often the most practical heat in a garage is radiant heat from above.

Have you considered other than in floor heat?


--
Joseph Meehan

Dia 's Muire duit

[Joseph Meehan]

Jimi wrote:
Hello,

I have bought a garage package (24ft x 30 ft) and plan on
putting " in floor" heat in the concrete pad. I have googled and
done several searches looking for a photo or any hand drawn examples
of how to lay the pex pipe prior to pouring the concrete. I would
like to know how to determine the diameter of pipe to lay...how far
apart to lay the pipes ...how many grids are needed?. This is a
simple heated garage...very basic, but can't find any schematic for
laying this pipe....Thanks for any help on this... Jim

In response to your direct question, I suggest contacting the various
manufacturers of the equipment for their recommendations. Be sure to
consider your local weather, your intended use and local codes. I
understand some areas prohibit what you are planning.

--
Joseph Meehan

Dia 's Muire duit

[DAC]

On Mar 12, 10:55 pm, "Jimi" wrote:
Hello,

I have bought a garage package (24ft x 30 ft) and plan on putting " in
floor" heat in the concrete pad. I have googled and done several searches
looking for a photo or any hand drawn examples of how to lay the pex pipe
prior to pouring the concrete. I would like to know how to determine the
diameter of pipe to lay...how far apart to lay the pipes ...how many grids
are needed?. This is a simple heated garage...very basic, but can't find any
schematic for laying this pipe....Thanks for any help on this... Jim

Hey Jimi,

I doubt you'll find anything online as each job is typically unique.
I can tell you from practical experience, it's the most forgiving
exercise in building you'll probably experience. Notice I didn't say
easy, or sloppy.

In a garage, I'd insulate the inside and outside of the footings, and
under the slab with 2.5 inch dense foam, blue or pink...but make sure
it's the dense stuff, I think I paid about $20 per sheet for the
Formular 250. The number of grids depends on the size of your
project, the size of pipe depends on the distance you'll be going from
your heat source. In the basement of the house I used all 1/2" pipe,
there isn't a run that's over 300' So one room has 5 runs with one
zone, another room has 1 run with 1 zone. On the 1/2 inch pipe,
where you make the 90 out of the concrete, sleeve the tube in 3/4
electrical PVC elbows, makes a nice smooth straight transtion.

In the above grade application, the first 3 rows of tube should be
about 6 inches on center beginning 6" exterior of the wall, from there
in spaced every 14-16". One place that was +- 50 to a workshop, it
uses 3/4".

You might want to check out these guys: http://www.pexsupply.com/
they have a ton of informaiton and supplies. Here's a picture of the
house I'm building with a picture of the basement floor just before
pour. http://goblin1.zool.iastate.edu/~dar...deas/Building/
photoalbum/target22.html You'll notice in the center all pipes come
together and are attached to the manifolds. By the way, make sure you
fasten the pipe securely to the insulation...of not, it could float
during the pour. I used staples which are a PITA. Some like to fill
the system with water, I didn't, but did have a full head of air on
the system with a pressure guage, so I could tell if one of the pipes
got nicked during the pour.

Bottom line is you should get some assistance if this is your first
project....either from the site provided, or from where you purchase
your supplies. It is a DIY project...but easier to do it right than
over.

DAC

[RicodJour]

Jimi wrote:

I have bought a garage package (24ft x 30 ft) and plan on putting " in
floor" heat in the concrete pad. I have googled and done several searches
looking for a photo or any hand drawn examples of how to lay the pex pipe
prior to pouring the concrete. I would like to know how to determine the
diameter of pipe to lay...how far apart to lay the pipes ...how many grids
are needed?. This is a simple heated garage...very basic, but can't find any
schematic for laying this pipe....Thanks for any help on this... Jim

The size and spacing of the PEX is dependent on the required heat
output which is dependent on your location, system size and operating
temperature, slab construction, etc. You've basically asked what size
of pants you need. We can't know that.

The manufacturer/distributor will size and layout the system for you
for free. There's no reason for you to reinvent the wheel on this.

R

[Edwin Pawlowski]

"Jimi" wrote in message
...
Hello,

I have bought a garage package (24ft x 30 ft) and plan on putting "
in floor" heat in the concrete pad. I have googled and done several
searches looking for a photo or any hand drawn examples of how to lay the
pex pipe prior to pouring the concrete. I would like to know how to
determine the diameter of pipe to lay...how far apart to lay the pipes
...how many grids are needed?. This is a simple heated garage...very
basic, but can't find any schematic for laying this pipe....Thanks for any
help on this... Jim

You can get that information by checking out the basics of radiant flooring
from the manufacturer. What you need to know first is how much insulation
you'll have in the floor, temperature of your region, temperature you want
to maintain, etc.

In most cases, heating the slab is not a good idea in a garage. It is very
slow to react both heating up and then cooling down so if you are using hte
garage for a shop on weekends, it will cost a fortune to start heating it on
Wednesday night to be comfy on Saturday morning. It may be OK if it is an
every day use though. If you want to just keep your cars warm, well, that
would be dumb and a terrible waste and probably rust them out when the road
salt heats up.

You may do far better and save a bundle of money using infrared heaters
mounted above.