How much topsoil over gravel to grow grass?

Question

We've got a section of garden with compacted gravel underneath. Can we lay topsoil on top and get grass to grow or does the gravel need to come up first?

Curtis · Answer

Yes — you can usually grow grass over compacted gravel, but the depth of topsoil is what makes the difference.

For decent grass growth you generally want:

* 100–150mm (4–6 inches) of quality topsoil minimum
* 150–200mm+ if possible for a healthier lawn long term

If the gravel is heavily compacted and doesn’t drain, it’s worth breaking it up first with a rotavator or fork. Grass struggles when roots hit a hard layer straight underneath.

A few things to check first:

* If the gravel is only a thin layer mixed into soil, you can often leave it.
* If it’s deep hardcore/crushed stone from an old driveway or patio base, removing at least some of it is better.
* Make sure water can drain — standing water will ruin the lawn.
* Add screened topsoil and lightly compact before seeding or turfing.

Best setup would be:

1. Loosen/break up compacted gravel base
2. Remove larger stones
3. Add 4–6 inches of topsoil
4. Level and compact lightly
5. Seed or turf

If you’re turfing instead of seeding, you can sometimes get away with slightly less soil, but thinner soil dries out quickly in summer.

Thanks
Curtis
WB LANDSCAPING

Andrew · Answer

I would take stones up first ,rotavate the soil thsn add topsoil if necessaly

How much topsoil over gravel to grow grass?

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