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Author Topic: Pour over  (Read 618 times)

coolidge

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Pour over
« on: April 21, 2017, 04:11:57 AM »

Ok it seems like everything is pointing to my garage slab. So a pour over it is, lots of work and money, but I am figuring a wood savings of 8 to 10 cord per year based on past usage.(2014/15)

So will zip ties be enough to hold tubing in place, I used staples last time.
Best kind of tubing.
I will keep runs 250 or under.
Add more insulation to outside concrete walls, bringing them to R35.
Vapor barrier on top of current Crete?
2" foam board?
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slimjim

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Re: Pour over
« Reply #1 on: April 21, 2017, 04:38:29 AM »

Will you be extending your insulation a couple of feet below your slab like we discussed?
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coolidge

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Re: Pour over
« Reply #2 on: April 21, 2017, 04:49:06 AM »

i am hoping so, excavation guy can't get me in until August right now.
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slimjim

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Re: Pour over
« Reply #3 on: April 21, 2017, 04:52:03 AM »

Have you thought of renting a mini for a few days and doing it yourself?
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hondaracer2oo4

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Re: Pour over
« Reply #4 on: April 21, 2017, 05:05:00 AM »

I am curious what exactly you think is the problem with the slab though. I hope I don't have the same issue with my new floor! I went with 2 inches xps around the perimeter to decouple the slab from the frost walls and then 2 inches underneath. I went with a 6 mil vapor barrier between the foam and the radiant tubing. Then I went with 1 inch xps around the exterior perimeter of the frost wall and went down 24 inches from grade. I planned to have this foam keep the frost from working it's way through the frost wall and under the slab.

This design was very common with everything I had seen and read.  I hope I didn't screw something up!
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mlappin

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Re: Pour over
« Reply #5 on: April 21, 2017, 06:20:37 AM »

Have you thought of renting a mini for a few days and doing it yourself?

Our mini also pivots at the cab, you can swing it clear over to the side which allows you to dig right next to a wall.
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coolidge

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Re: Pour over
« Reply #6 on: April 21, 2017, 08:13:07 AM »

I have no idea what is going on with it really, just that winter of 14/15 I used 8 cord to heat both, last winter 15/16 up to 16 cord and winter 16/17 will be 18 plus cord. Not burning that much wood.

Option B.  Just run water to air exchangers, no radiant.
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hondaracer2oo4

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Re: Pour over
« Reply #7 on: April 21, 2017, 08:37:07 AM »

So at first the slab wasn't an issue and now suddenly it is???? That makes zero sense to me. I know you said your underground lines aren't an issue but are they logstor or thermopex ?
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coolidge

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Re: Pour over
« Reply #8 on: April 21, 2017, 10:01:02 AM »

Makes no sense to me either, heating guy just left baffled, digging holes, insulation under slab not wet. Logstor pipe

   Dynamite on order :bash:
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mlappin

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Re: Pour over
« Reply #9 on: April 21, 2017, 10:29:23 AM »

Maybe and IR camera would come in handy here as well? Should show cooler shouldn’t it wherever the heatsink is….
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hondaracer2oo4

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Re: Pour over
« Reply #10 on: April 21, 2017, 12:20:11 PM »

How did you check under slab ? Is this a monolithic floating slab?
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coolidge

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Re: Pour over
« Reply #11 on: April 21, 2017, 12:33:35 PM »

IR camera shows nothing on outside of slab, cored a hole today, nothing, dug some holes outside, nothing.
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hondaracer2oo4

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Re: Pour over
« Reply #12 on: April 21, 2017, 12:47:59 PM »

You did the pour? You didn't skip I insulation in the center of th slab did you? They do that done south to use ground as part of the heAt sink.
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mlappin

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Re: Pour over
« Reply #13 on: April 21, 2017, 01:25:00 PM »

A data logger there would come in handy but I have a feeling that if its your slab you should have a noticeable temperature drop on the loop heating the slab all the time.


Do the pumps for the radiant loops run all the time? 90% of the time? 50% of the time?
« Last Edit: April 21, 2017, 01:26:49 PM by mlappin »
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Wood-Eze model 8100 firewood processor

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coolidge

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Re: Pour over
« Reply #14 on: April 21, 2017, 02:03:58 PM »

Didn't skip any Insulation.  Radiant pump runs 75 percent.
Wish I had that data logger today, 200 ran from 830 this morning until 230 this afternoon to bring the water too 180.
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