To calculate how many cubic metres (m3) of gravel you will need to use, firstly measure the area of the garden to be covered.

The width x length will give you the area in square metres (m2). eg. an area measuring 8m x 5m = 40 m2. Then multiple your square metre measurement by 0.05 ie. 40 x 0.05 = 2m3 of product required for good surface coverage.

Area of garden (m2) x 0.05 = volume of gravel required (m3)

This will cover your garden in gravel to a depth of 50mm which is recommended to retqin valuable soil moisture and inhibit weed growth.

The laying of weedmat first is a good idea to keep the gravel separate to the soil. Weedmat is woven to enable water to pass through and will degrade in sunlight and break up over time.