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If you are just topdressing the lawn then I wouldn't worry about the compaction factor but if you are trying to bring the level up to a specific grade or fill planters, and you don't account for compaction of the soil you won't have enough soil. Soil is nice loose and fluffy when dumped off the truck but when you spread it, level it and then let the rain hit it; it loses the fluffiness and compacts. Different soils have different rates and it is not a hard and fast rule. In the area I work I use about 15% extra while it seems Dale uses about 23% extra. Sand and Gravel are a little different. Pea gravel is pretty much dead on but road course and sand I will tack on about 10% extra.
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