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Author Topic: Radiant in garage slab  (Read 2660 times)

hondaracer2oo4

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Re: Radiant in garage slab
« Reply #15 on: March 12, 2016, 07:23:39 AM »

Yeah I have not seen the mechanical tool for pinning down the pex to the foam but I have seen the fish hook style clips that pin down the pex. Anyone think that I should really use 02 barrier pex instead of regular Aqua pex? I think I will be using antifreeze in the pipe and be isolating it from the system with a flat plate.
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mlappin

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Re: Radiant in garage slab
« Reply #16 on: March 12, 2016, 12:30:50 PM »

I would think regular pex would be fine.

Stay away from pex al pex as itís all made in China now and the quality is somewhat dubious
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MerrellRoofing

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Re: Radiant in garage slab
« Reply #17 on: March 12, 2016, 03:36:32 PM »

I stapled mine to the foam in the basement. Pretty fast and easy. Only 3-3-1/2" pour though. Works very good. Might have to raise the pipe a little if you are pouring 5-6".
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farmboythegreat

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Re: Radiant in garage slab
« Reply #18 on: March 12, 2016, 03:45:45 PM »

lust lurking and learning ..... would it be optimal to have the tubes in the middle to the cement thickness ? ..
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Re: Radiant in garage slab
« Reply #19 on: March 12, 2016, 04:00:33 PM »

every thing I have read on this subject says your tubes should be within 2 inches of the finished floor
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mlappin

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Re: Radiant in garage slab
« Reply #20 on: March 12, 2016, 08:33:28 PM »

every thing I have read on this subject says your tubes should be within 2 inches of the finished floor

Iíve read just the opposite a few times, the lower in the pour the more evenly the heat spreads out.

If your using a product like Crete Heat the tube is at the bottom of the pour.
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schoppy

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Re: Radiant in garage slab
« Reply #21 on: March 12, 2016, 09:02:47 PM »

Two items, first all cement contractors I talked to said to staple it to the foam. 2" high density for the weight of the cement and anything your going to be driving on it ( I store my 40,000 lb rv in my shed). Pex always at the bottom of the pour no matter the thickness, heat rises and then makes the entire cement mass a heat sink. Second using O2 barrier pipe on pressurized systems is the standard for all HVAC systems regardless the heat source and the price difference is minimal. This only makes sense since you will be using air vents to get out the air in the system and you don't want additional air entering the system.

I purchased a pex stapler tool from Menards for about $100 and it was the best investment I made. One person lays the tubing in place and the next walks along stapling it down, it is designed to be used walking along. If you lived closer I would let you use mine for free. 

I did a lot of research on all my in floor systems beforehand and this is what I was told by all the most reputable contractors I know.
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willieG

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Re: Radiant in garage slab
« Reply #22 on: March 12, 2016, 09:35:30 PM »

every thing I have read on this subject says your tubes should be within 2 inches of the finished floor

Iíve read just the opposite a few times, the lower in the pour the more evenly the heat spreads out.

If your using a product like Crete Heat the tube is at the bottom of the pour.

Well, those guys that invent this stuff know a lot more than me so I guess I should have read more, I stand corrected.
But if it was my floor I would ensure the whole slab was insulated including the vertical edges and I would still try and have my tubing nearer the finished floor than the bottom of the slab...I guess I'm still old school. 

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mlappin

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Re: Radiant in garage slab
« Reply #23 on: March 13, 2016, 07:13:24 AM »

every thing I have read on this subject says your tubes should be within 2 inches of the finished floor

Iíve read just the opposite a few times, the lower in the pour the more evenly the heat spreads out.

If your using a product like Crete Heat the tube is at the bottom of the pour.

Well, those guys that invent this stuff know a lot more than me so I guess I should have read more, I stand corrected.
But if it was my floor I would ensure the whole slab was insulated including the vertical edges and I would still try and have my tubing nearer the finished floor than the bottom of the slab...I guess I'm still old school.

Thats how I did my sidewalk, tube in the middle of the slab, on really cold days it leaves streaks unless you turn the heat up a touch, if I was to redo it Iíd leave the tube at the bottom of the pour. But I did this 15 years ago when all I had at the farm was dial up yet and doing any intensive research on the internet was a long, slow tedious undertaking.
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Gooseman

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Re: Radiant in garage slab
« Reply #24 on: March 13, 2016, 07:42:42 AM »

When I did my basement floor a few yrs ago I asked around and everyone I talked to said to lay the Pex in the bottom of the concrete to get an even heat. Around my neck of the woods infloor heat is very popular. Just on my drive into work which is 30 mins I see about 20 places that have OWB going.
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mlappin

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Re: Radiant in garage slab
« Reply #25 on: March 13, 2016, 10:30:24 AM »

So on the topic of floor heat, anybody find a free cad program just for laying the loops out?

All kinds of options on the net Iíve seen, most start around $750, but do much more than just the layout.
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hondaracer2oo4

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Re: Radiant in garage slab
« Reply #26 on: March 13, 2016, 11:40:42 AM »

Google cad loop. Free 30 day trial.
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mlappin

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Re: Radiant in garage slab
« Reply #27 on: March 13, 2016, 01:55:43 PM »

Google cad loop. Free 30 day trial.

Ahh, my bad, also has to be Mac compatible.

I refuse to load Boot camp or any other Windows emulators as then Iíd technically have Windows on my Mac and very shortly it would be a piece of crap like every PC I owned before.
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schoppy

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Re: Radiant in garage slab
« Reply #28 on: March 13, 2016, 10:01:49 PM »

I had 2 friends helping me lay out my loops when I did my shed. As I mentioned it has 10 loops ranging from 225 to 275 feet long. Be sure to label the supply end and return ends of each loop at your manifold and leave plenty of tubing for hook up. The outer edges of the building is where the greatest heat loss occurs and should be the areas where supply from the loops along that area start out first. I used 1/2" o2 barrier pex on 12" centers, my shed is 50'x60' and is also insulated around the perimeters like willieG had suggested. Heats great and very even.
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hondaracer2oo4

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Re: Radiant in garage slab
« Reply #29 on: March 14, 2016, 06:27:12 AM »

Thanks everyone. Shoppy, did you have garage doors? Any thermal break across the door opening? I have read both ways from reputable sites. Some say to staple down, some say to attach to the mesh and bring to the center of the pour, no deeper than 4 inches. I think I will staple if I can find a stapler for rent. If not I will zip tie to the mesh.
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