![]() If you use some sort of a choker course of finer material on the top of the subbase, it will support your people and equipment during concrete placement. The Concrete ProducerĪ base course on top of the subbase makes it easier to get to the proper grade and to get it flat. Recycled crushed concrete is an excellent source for subbase material. The subbase material is usually a reasonably low cost gravel without a lot of fines. A subbase can also act as a capillary break, preventing water from wicking up from the groundwater table and into the slab. The thicker the subbase, the more load the slab can support, so if there are going to be heavy loads on the slab-like trucks or fork lifts-the designer will probably specify a thick subbase. Typically, the top of the subgrade should be graded to within plus or minus 1.5 inches of the specified elevation.Ī subbase and base course, or both, provide several good things. The problems with that are that the soil may not drain well and it can be muddy during construction if it gets wet, it may not compact well, and it can be difficult to get it flat and to the proper grade. ![]() ![]() If the natural soil is relatively clean and compactable, then you can put a slab right on top of it without any extra layers. The only layer that is absolutely required is the subgrade-you have to have ground to place a slab on ground on top of. ![]() A compacted subbase keeps workers out of the mud. ![]()
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