Adding additional radiant heating.

[Johnnys Shop]

Hello Masters

I posted this with a ton of other questions in the general discussion but thought maybe I should of broke it up.

I am going to be adding a 20x24 addition onto my existing 24x26 shop. In Central Alberta

I would like to put a wood floor above the concrete, for my knees sake (arthritis) and for the woodworking tools. 2x4's with plywood over top sound good?

I have radiant floor heating in my shop It helps with the arthritis and I would like to continue this in the new shop. My boiler is 115,000 btu's and was installed last year, after the previous system installed 2008 was horrible and done wrong is every aspect.

So can I pour directly beside my current pad and have it a little lower so I can have the wood floor flush with my current floor?

Can the lines for the heating run along the ceiling into the new section as my man door is on the same wall as the boiler. the line will have to run 24'+ to get to the new floor. Do I or should I have a separate pump and thermostat to the new section.

I did not insulate the outside of my current pad. I have a feeling like I should with the new one. Is 2 inches enough to make a noticeable difference? Looking for real world experience here.

I did insulate and vapour barrier current pad underneath and its been crack free except for one hairline in the corner that is often hard to spot. (6 years)

 

[kwfloors]

Why pour another slab if your going to frame a floor? Just do a crawl and floor joist off your slab the height of your slab -3/4 for plywood.

 

[Johnnys Shop]

Well you get an idea in your head...
So make some footings below frost line. then pressure treated beams, and spray foam. I would need it on a separate system as the floor would heat up a lot faster then the slab would it not.

 

[mygarageone]

All you would need to do is put in some flow control valves and slow the flow down for the wood flow. The slower the rate of flow , the less heat you recover.
Once you have it balanced out your fine.

 

[Johnnys Shop]

yup going with the crawlspace just a different way of doing it. Building Panels in 10x8 sections with vapour barrier and plywood. then flipping them over and installing roxul insulation and the piping. Thinking I might put a layer of spray foam down though before the insulation.