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Author Topic: Radiant in garage slab  (Read 13214 times)

mlappin

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Re: Radiant in garage slab
« Reply #30 on: March 14, 2016, 06:58:44 AM »

Supplyhouse has a stapler for around $200, when done you can always list it on Craigslist or Ebay.
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farmboythegreat

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Re: Radiant in garage slab
« Reply #31 on: March 14, 2016, 09:03:21 AM »

oh look ... your back will thank you  https://www.youtube.com/watch?v=oNWXrhvoWNM
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mlappin

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Re: Radiant in garage slab
« Reply #32 on: March 14, 2016, 11:23:30 AM »

oh look ... your back will thank you  https://www.youtube.com/watch?v=oNWXrhvoWNM

Same as Supplyhouse, one of the reviews suggested slipping a pipe coupler over the magazine to help the feeding once it gets closer to empty. Supplied weight appears to be a little light.
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schoppy

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Re: Radiant in garage slab
« Reply #33 on: March 14, 2016, 11:25:22 PM »

Yes Honda, see my first post on page 1, 2-20' overhead doors. Cement contractors and building supply stores probably have rolls of thermal break material usually 1/2" or 5/8" thick. The other material I have used is like rubber cow matts cut into strips wide enough to go below the cement thickness and then topped off with self leveling caulk.

I must have paid more like $200 or so for my Malco stapler but well worth it. I may sell it now as no more projects in store for me.
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hondaracer2oo4

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Re: Radiant in garage slab
« Reply #34 on: May 26, 2016, 07:20:18 PM »

Back to this again. Any thoughts on vapor barrier under the foam vs vapor barrier over foam but under pex? The guys at green building advisor suggest the latter.
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schoppy

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Re: Radiant in garage slab
« Reply #35 on: May 27, 2016, 12:06:55 AM »

Sorry, been busy getting my food plots in and cutting wood. All my contractors said the vapor barrier goes under the foam to prevent ground moisture from rising into the insulation. If you put the vapor barrier between the insulation and the pex you will be putting a lot of holes in the vapor barrier if you staple down the pex to the insulation. That doesn't make any sense to me. Also used high density 2" insulation under the cement for greater load capacity.
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hondaracer2oo4

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Re: Radiant in garage slab
« Reply #36 on: May 27, 2016, 04:29:46 AM »

The guys over at green building advisor seem a little nuts. http://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/94096/poly-vapor-barrier-under-xps-foam-board-slab-#comment-173336

It seems like a lot go with vapor barrier under everything with good success. I just don't want to fill it with rain water before the pour. I could try and get a tarp but it will have to be pretty big, bigger than 28x40.
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mlappin

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Re: Radiant in garage slab
« Reply #37 on: May 27, 2016, 08:28:43 PM »

The guys over at green building advisor seem a little nuts. http://www.greenbuildingadvisor.com/community/forum/energy-efficiency-and-durability/94096/poly-vapor-barrier-under-xps-foam-board-slab-#comment-173336

It seems like a lot go with vapor barrier under everything with good success. I just don't want to fill it with rain water before the pour. I could try and get a tarp but it will have to be pretty big, bigger than 28x40.

A lot of anal retentiveness going on in that thread you posted.
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hondaracer2oo4

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Re: Radiant in garage slab
« Reply #38 on: May 29, 2016, 10:10:50 AM »

Others out there with garage in slab systems, pressurized or non pressurized on the radiant side? I plan to fill the radiant side with antifreeze. I will keep the boiler and the radiant separate with a flat plate hx
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willieG

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Re: Radiant in garage slab
« Reply #39 on: May 31, 2016, 06:50:02 PM »

Others out there with garage in slab systems, pressurized or non pressurized on the radiant side? I plan to fill the radiant side with antifreeze. I will keep the boiler and the radiant separate with a flat plate hx

make sure you have an expansion tank for the pressurized side (size of tank depends on many things,,,google amtrol hydronic expansion and you may find help)
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hondaracer2oo4

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Re: Radiant in garage slab
« Reply #40 on: June 01, 2016, 06:52:16 AM »

Sounds good. I will make the radiant side pressurized and designed just like any hydronic system in a house. Just minus the boiler in the loop.
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