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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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