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 - Oliver 550 Clutch Overhaul Tips - by Greg Sheppard. I got my 1964 Oliver Model 550 (serial 141-139-519) second-hand and used it for several years before the clutch began to slip. After taking up the pedal linkage several times I saw it was going to take more than that. The engine had been leaking oil at the rear seal and I suspected
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