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Author Topic: Pour over  (Read 16123 times)

hondaracer2oo4

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Re: Pour over
« Reply #30 on: April 23, 2017, 10:59:15 AM »

So you heated one year both garage and house with 8 cords. Next year it took 16?
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coolidge

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Re: Pour over
« Reply #31 on: April 23, 2017, 12:30:18 PM »

Ayup :bash:
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Cabo

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Re: Pour over
« Reply #32 on: April 23, 2017, 02:22:48 PM »

If you choose to add foam, how about digging out/down(on an angle) to avoid undermining the slab.  This would be crucial on the eave sides of the building as well as where you drive in.  I might require using 4' of foam but you never can get great compaction at the very top once something is undermined.
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coolidge

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Re: Pour over
« Reply #33 on: April 23, 2017, 06:18:04 PM »

I dug out about 5ft today, I am only going to be able to go down about two ft without the dirt from falling in from under the slab.
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hondaracer2oo4

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Re: Pour over
« Reply #34 on: April 23, 2017, 06:49:26 PM »

I am having a hard time believing that your issue is frost getting underneath the slab. Especially since the first year was fine.
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hoardac

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Re: Pour over
« Reply #35 on: April 23, 2017, 07:44:09 PM »

I am having a hard time believing that your issue is frost getting underneath the slab. Especially since the first year was fine.

Yes I concur with that double the wood seems like another issue.
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schoppy

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Re: Pour over
« Reply #36 on: April 23, 2017, 09:45:57 PM »

Coolidge, is your garage a separate system from your OWB? Is it sealed and pressurized utilizing a plate heat exchanger or how are you doing it? Not sure what you mean by your pump running 75% of the time, my pump for the in floor system runs only when the T-stat calls for heat. What temperature do you maintain in the garage? Have you done a temp drop across supply and return for the garage?
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coolidge

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Re: Pour over
« Reply #37 on: April 24, 2017, 04:13:26 AM »

OWB sits about 14 feet from garage, I ran Logstor from unit to back of garage, maybe 50 ft run.
There is no plate exchanger. Primary circ. Taco 010
Secondary circ. Grunfos ( not shure of size)
Usually I keep thermostat at 68 to 70, so pump will run 75 percent of time.
Gauges at back of boiler, and inside garage show no heatloss in Logstor.

Garage.    28 x 40.  4ft of concrete wall on top of slab, 10 ft wood famed wall on top of concrete.
1- 12 x 12 garage door( insulated)
2- 3 x 7 man doors(insulated)
No windows.

Roof.   4" closed cell foam (R28) with 6" open cell foam over it (R24).  Total R52
Wood framed walls 4" closed cell foam(  R28)
4ft concrete walls 3" closed cell foam( R21)
Under slab 2" foam board

Thinking maybe just hook up another modine and scrapping the radiant altogether.
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slimjim

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Re: Pour over
« Reply #38 on: April 24, 2017, 04:48:35 AM »

Well as far as frost getting under there, if water got under there then frost can also get under there, perhaps someplace around the perimeter water and cold got into the foam and it is now leaking. We know that the stove is a little bit less efficient, we know the pipe is the best on the market and that there is no issue with it and we also see wet soil under the slab, I'm gonna go with the issue stemming from the perimeter walls not being deep enough and a high water table or leakage.
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hondaracer2oo4

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Re: Pour over
« Reply #39 on: April 24, 2017, 05:08:26 AM »

How are you controlling the delta t of the floor back to the boiler? What is the delta t?

Radiant systems should be a separate pressurized system, but that's not causing you to lose all the btus.

I didn't go with a floating slab for a couple reasons. One of the major reasons was the fact that I couldn't find any good way to isolate a floating slab for radiant. It has to have ground water somewhere around the slab pulling the heat out but I would think you would easily be able to see that on one or more of the loops. How many loops did you go with?
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coolidge

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Re: Pour over
« Reply #40 on: April 24, 2017, 11:48:39 AM »

Well I am tired of running a shovel, but I have found the problem. There is water between the vapor barrier and Insulation. Now how too fix?
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slimjim

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Re: Pour over
« Reply #41 on: April 24, 2017, 12:15:55 PM »

Pics buddy pics!
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mlappin

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Re: Pour over
« Reply #42 on: April 24, 2017, 12:28:40 PM »

Well I am tired of running a shovel, but I have found the problem. There is water between the vapor barrier and Insulation. Now how too fix?

You used closed cell insulation correct?

A lot of the time when father was still doing septics a lot of problems could be solved by installing a perimeter drain to get rid of the excess water.
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coolidge

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Re: Pour over
« Reply #43 on: April 24, 2017, 12:41:16 PM »

Just stuck my hand in between plastic and insulation, came out wet, no real way to take a picture. Would you think that was the problem, the water under the insulation?

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slimjim

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Re: Pour over
« Reply #44 on: April 24, 2017, 12:53:23 PM »

We use water to transfer heat over great distance effectively, it can be your friend or your enemy, it's kind of like drowning cause you can't swim in the lake or enjoying the nice weather today by being on the water with a fishing pole in your hands!
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