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Understanding loose fill volume, settlement and how much compost or topsoil to order.
Compost and topsoil are supplied by loose fill volume at the time of packing, the recognised UK industry standard. Because these are natural materials containing air spaces, their visible volume may change after packing, dispatch and installation.
Loose fill volume is the volume a material occupies when it is:
Settlement reduces internal air spaces but does not reduce the quantity supplied.
Further settlement occurs after installation in:
General landscaping: allow 10–20% extra.
Raised beds & containers: allow 10–25% extra.
Natural settlement occurs after packing and dispatch. This is normal.
Yes. Higher organic matter increases compression and decomposition.
Allow 10–20% extra for general use and 10–25% for raised beds.