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mark gilligan
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I have for years wanted to build a shop with a heated floor for use in the winter months. This is my plan please let me know what you all think and the best way to design/build it so it will work. If you dont think it is doable say so. You wont hurt my feelings. Ok ? My plan for the shop is to use hollow core conrcete planks ( www.molin.com) for the floor in the garage . My question is can I somehow make a manifold to connect to one end of the planking to feed hot air through it and another on the other end for the used air to vent, using a rocket style stove for the heat source or possibly any other style stove. the garage would be 20' x 20' at least , maybe bigger. My biggest concern would be can i generate enough heat from the stove to heat the floor or would it take forever for it to warm up? the specifics on the concrete planks are on molins site .Any help or comments are welcome. Thanks
 
            
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It would take awhile to heat up for sure. Insulate the floor well enough and I think it could work. How would you bring the hot air into the floor? I am installing an earthen floor in a 20 x 20 space currently and have wondered about heating the slab from the stove. There is a video, perhaps one of Paul's, that shows a heated slab with radiant heat via copper tubing wrapped around the stove pipe. My intuition is that using radiant tubing style systems are more efficient, not sure though. Either system will utilize electrical pumps/blower. I think by the time you design and install the system you will have lots of parts both electrical and mechanical. Instead you could install inexpensive electrical heating cable made for floors under your flooring. If the slab is insulated really well this would be far simpler and would achieve the results desired, warm feet. A 20 X 20 space is small, a wood stove would easily heat the room. Making you feel warm and happy that you did not go to all the trouble.

I say more power to you if you figure it out and it is efficient though. I am always thinking of ways to heat, it is winter. For now I use a woodstove and sweaters!
 
mark gilligan
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well, the concrete planks are available in different widths and lengths check their website (www.molin.com), they also have holes in them for the entire length which the hot air could be pushed through, the hole idea is to heat the floor because when working on the vehicles i spend most of my time on the floor.Once the concrete gets warm , i would imagine it would be easier to keep it that way.what i would like to know is has anybody tried working with the concrete planking and use it as a heated floor? It just seems that it is readymade for this application , i just wouldnt know where to start , i dont think it would be difficult , just need some input on how to get it done . thanks for your input.
 
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Video of all the permaculture design course and appropriate technology course (about 177 hours)
https://permies.com/wiki/65386/paul-wheaton/digital-market/Video-PDC-ATC-hours-HD
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