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Old 04-30-19, 02:02 PM   #1
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Join Date: Sep 2010
Location: Louisville, KY
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Default Hydronic in outside walkway.

I have been working on building a front porch using allen block and dense pack gravel to be capped with pavers. The porch in about 25ft wide by 11ft and will have a walkway on one side that leads to the driveway, the walkway will be about 35-40ft long.

My thought is to set pex (1/2in) on the base and cover with polymetric sand for the sidewalk. The purpose will be to help buffer the brick temp in the winter allowing for snow to melt as the first 10ft is shaded all day in the winter. In the summer I will use it to preheat the water heater.

I will be using a propylene glycol mix to prevent freezing since the line will be about 4in below the top of the brick. I will figure out the heat exchanger and pump for it later.

What are your thoughts on this idea? Located in Northern KY.

What should I use to protect and seal the pex entering the house via basement cement wall?
Do you see issues if I install a short loop where the walkway will be and just cut the pex and splice in a longer run when I build it? Alternitively I would run a single loop of 100ft.

I plan on adding hydronic under the floor in the house in the future and possibly adding solar HW.


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hydronic, pex, sidewalk

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