eXodus
Solar Addict
- Joined
- Jul 27, 2020
- Messages
- 1,457
It’s not a money thing , all our slabs for radiant heat have a minim of 2” foam board on the bottom , and a max of 4” of concrete 4500 psi with glass fiber.
I allso use steel 6x6 wire so I can tie the pex tubing to it .
I use steel tubing chairs to keep the pipe in the top half of the slab .
The reason is a 4” slab with the heat tube 11/2 from the top gives the floor a fast recovery .
You can
I can run the water at 100o and it comes back @ 92o with a 200 foot loop .
My floor has 7 runs at 189 ‘ so it dosent cool much at all .
A 10” slab will not get hot enough to pass heat to the home , you would end up running the water at 120 o +
and that kills the efficiency.
My pex system in Germany is about 3 inches deep into the slab. It is not fast by any means, like I said before, you turn the temperature up and it takes 3 days to take effect.
We are actually running 29 Celsius - 84 Fahrenheit water in the living spaces and 33C - 93F in the bathrooms.
basically you pour a 4-6 inch slab - then get the pex down and rebar and then pour another 4 inches on top.
A lot the Energy we get from Solar Thermal Panels - got about 6 sqm.