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no vapor barrier in garage slab
The biggest problem is NOt from vapour migrating through the floor, what will kill your stuff in short order however is the heat/cool cycling.
If you do not keep the building heated there will be considerable condensation formed on anything with a bit of mass which will take longer to warm. Likewise after you stop heating the space, the objects with some mass to them, and therefore the ability to hold heat longer than air, will be covered by condensation. It is this process which does the bulk of the damage.
The only two ways to prevent this happening are to keep the space heated, or keep the humididty low, a room-type portable de-humidifier might just do the trick, if nothing else it will help trap moisture before it can get to you equipment.
Best of luck.
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no vapor barrier in garage slab
One of the golf courses we do work for has built a rather unique system for their equipment building.
It is basically a very basic home-made geothermal heat pump. They pump water off the bottom of a deep pond and through a series of car radiators enclosed in a sheet metal box. A conventional squirrel cage type blower recirulates air through the whole apparatus. While the building is fairly well insulated & draft-proof it otherwise unheated except for a little solar gain. This system keeps the shed at a minimum of 40 deg.'s F. regardless of how cold it gets outside. This might not be warm enough for working, but it keeps everything above the freezing point.
The system was originally installed (as was mine) to act as an air-conditioner & de-humidifier, the winter use was an after thought.
Best of luck.
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no vapor barrier in garage slab
There is a company called Sedore which manufactures a nifty unit, the fire burns sideways not vertically, drawing wood down from a hopper in the top of the stove. The hoppper allows up to 24hrs. burn time from a single load, it will burn almost anything, wood, pellets, corn, even corn cobs & sawdust.
The biggest benefit being that once it is running you can load the hopper with greeen wood and by the time it gets to the fire it is already dry.
They also make a model with a water jacket, I'm not sure if it is approved for potable water, but I do know several people who use them in conjunction with a circulation pump and radiators to spread the heat to other rooms.
There is no reason you couldn't use the hot water from such a unit to pre-heat the water in a storage tank. In fact they make, as strange as it sounds, hot water-fired water heaters, actually a water-to-water heat exchanger, for people who use a boiler to heat the house and domestic hot water. In your case the woodstove would pre-heat then keep the water in the storage tank warm (hot?) until the water heater called for it, then you would only pay to heat it from that point up to what you desire. If you used much hot water and kept a fire going anyways the savings could be substantial.
Best of luck.
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Gas Generator Weather Protecti
07-14-2017, 15:25 
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