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Question DetailsAsked on 7/4/2014

I need a hole in my back yard filled with some kind of rock or chopped up cinder block then filled with dirt& seed.

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1 Answer


Do NOT fill with rubble or large rocks, or you will get a sinkhole effect over the years as the fines migrate down into the voids in the rubble fill. What you want is free-draining common clean fill like gravel or crushed rock, 6 inch minus if this is a very large hole, or 3/4" minus if just a little swale or dimple in the yard, compacted as placed, then typically 1-2 inches topsoil and seed or topsoil and sod if instant lawn is wanted.

Landscapers would be the normal category for this type work unless you are talking multiple truckloads, then an Excavation contractor for the fill and compaction and topsoiling, then do seeding yourself. Plus mulch or straw or biodegradable mulch blanket if on slope to protect against erosion till grass takes hold.

When backfilling leave the common fill a bit high in a dome - about 1 inch per 2-3 feet of fill thickness, depending on compaction quality, is a good round number - to allow for settlement as the area is watered so the end result in a couple of years will not be a sagging dimple. If not compacted as filled then about 1-2 inches per foot of fill would be more typical for amount of settlement expected, as a very general number. Higher end for clayey or sandy gravel fill, lower range for crushed rock fill.

Answered 6 years ago by LCD

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