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Caping definition, a sleeveless garment of various lengths, fastened around the neck and falling loosely from the shoulders, worn separately or attached to a coat or other outer garment. See more. Dictionary.com
In basic terms, in road construction a capping layer is a depth of generally oversized hardcore required beneath the sub base when ground condition testing has determined the CBR is too low. The CBR is the California Bearing ratio and scales the compactibility of the existing ground.A capping layer will be approx 200mm in depth and will be compacted in 50-100mmlayers using a twin drum seated roller.The capping layer is the lowest level of the road construction. the sub base will be approx 150-200mm followed by binder course of 20mm dense bitumen macadam followed by 40-60mm of 10mm surface course.I took this next bit froma manual extract, hope it helps:he CBR is the California Bearing ratio and scales the compactibility of the existing ground. A capping layer will be approx 200mm in depth and will be compacted in 50-100mmlayers using a twin drum seated roller.