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Fixing old slab: Radiant wood floor ideas.
My new project has an existing 1700sf barn/ utility building on the property. It's two buildings .. the older part is a 24'w x 32'L garage from the 60's with a rough poured sloped slab. Block foundation -- old slab is level to the top of the block in the back and maybe 4" down at the front where the main garage door was. The previous owner attached a new larger SIP building to the old garage back in the 90's -- remaking the outside to look like an old barn. The buildings are open to each other -- the large 8x8 hinged garage door is now on the newer building.
My plan was to make the older part into a studio/workshop -- ideally with a heated wood floor. Got a price: around 15k a few years ago to properly take out the old slab -- Prep/ VB/ Insulate/ PEX. That still leaves the installation of some type of wood floor over the heated slab ... really can't spend 20k
Back in the mid 00's I added a 16 x 22 addition to my house - block/ slab on grade. Took PT 2x4's or 6's on the flats w/ 1.5" insulation between -- Warmboard and 3/4 T&G on top -- tied it into the existing radiant system. Works great.
I'm wondering if anyone has ever tried to retrofit a wood floor and include radiant?
I know nothing about over-pouring concrete. But -- by leveling the old slab I could basically put down a plastic VB and build on top. Again using 2x6 on the flats. The property is in PA and we have local mills - 1.5" thick long length wide hardwood is available that people use (face nail) in studios and man caves -- is't cheaper (and easier) vs putting down plywood and 3/4 T &G . The problem would be the radiant -- if I only put down 1" foam between the sleepers -- place PEX 3/8 tubing on top of the foam. What do you think I would get as far as BTU's per foot?
The old building has no windows -- one 32" typical door. The other building being SIP -- its like a cooler. Because of the construction and loss of propane -- I'm currently heating the whole thing with a 4k 240v electric heater. I'm using Warmboard in the main house -- that would add 6k.
I can't put this off too long because by summer time the ability to get equipment and cement truck to back of property will be problematic.