Question 1

How deep should topsoil be for a new lawn?

Accepted Answer

For a new lawn, you need a minimum of 100-150mm (10-15cm) of topsoil. For best results, 150mm is recommended. If you are laying turf on top, you can reduce this slightly as the turf brings its own thin layer of soil.

Question 2

How much does a bulk bag of topsoil weigh?

Accepted Answer

A standard bulk bag of topsoil weighs approximately 1 tonne (1,000kg) and contains roughly 0.7 cubic metres of soil. Bulk bags are the most cost-effective way to buy topsoil for larger projects in the UK.

Question 3

What is the density of topsoil?

Accepted Answer

Topsoil typically has a bulk density of around 1,200-1,600 kg per cubic metre, with 1,400 kg/m3 being a common average. The exact density depends on moisture content, organic matter, and soil composition. Wet topsoil is significantly heavier than dry.

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