How deep should topsoil be

Question

Going to turf the garden and keep seeing different depths mentioned, so I’m not sure what’s actually enough for the grass to take properly?

Tim · Answer

Ideal depth of top soil for a lawn should be a minimum 150mm , 6 inches. However good drainage below that is also recommended.

Peter · Answer

Hi 
100-159mm depends on existing ground conditions

Alan · Answer

Hi,

There should be a minimum of 3 inches of good quality topsoil , I.e. seived soil that doesn't contain  stones or twigs

Hope that helps.

Regards Alan

Paul · Answer

If your just turfing the garden then 6 inches is fine

Andrew · Answer

If it’s for turf my first question would be what is wrong with the old lawn?  Is it lack of drainage, was it not turfed before and was a flower bed,? is there underlying rubble.

It’s then not necessarily about how much topsoil is needed but what is going to be underneath it.

Lee · Answer

100mm to 150 mm so that the new Turf roots can bed it properly

Kyle · Answer

for new grass around 100–150mm double that for flower beds, hope that helps.

Matthew · Answer

Hi, the top soil should be between 6 inches to 10 inches deep

Audrey · Answer

You’ll want around 100mm - 150mm (4–6 inches) of decent topsoil for turf.

100mm is usually enough to get it established, but closer to 125mm – 150mm gives the roots a bit more depth and helps in dry weather.

Just as important is the prep, clear weeds, loosen and level it properly, then firm it down so it doesn’t sink later.  Most lawn problems come from poor prep rather than not having quite enough depth.

Max · Answer

Topsoil depth depends on the project: typically 4–6 inches (10–15 cm) for new lawns, 6–12 inches (15–30 cm) for garden beds, and over 12 inches (30+ cm) for deep-rooted vegetables. A good, all-purpose rule of thumb for general landscaping is to aim for 6 to 12 inches of quality, fertile soil for optimal plant growth

How deep should topsoil be

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