The purpose of a vapor barrier is to reduce the amount of moisture coming up from the ground. Moisture in the concrete will naturally evaporate. If you have a high water table then it may be advisable to put a vapor barrier. The engineers generally determine if it is to be between the concrete and base or otherwise. Plastic or visquine (sp) is not sufficient. You need a material specific for the task. As to the sub-base, depending on your soil and its compaction ability, concrete can be poured directly on top of a level, compacted surface. A sand/gravel mix works well as it compacts very well and provides a good base. If you are planning to park heavy equipment on it you need to consider the thickness of the concrete and use of steel. If it's just a home workshop a good steel wire will help hold it together. Make sure you put in a sufficient number of saw cuts to control cracking. Here is a website that may help.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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