5 – 7mm Drainage Aggregate

5-7mm Drainage Aggregate, also known as 5-7mm Crushed River Gravel or CRG, is a natural product used for back-filling trenches, around PVC and Ag-Pipe, and for drainage behind retaining walls. As this is a natural construction product, the colour of the rock varies from a light grey, to blue, to brown in colour.

One of the main uses of 5-7mm Drainage Aggregate, is as a drainage layer for Bio-Retention Pits, also commonly known as Rain Gardens.

These products can also be used for a base underneath concrete and can even be blended into concrete mixes due to their high compressive strength.

5-7mm Drainage Aggregate is available by the tonne.

Unsure of how much material you need?

To assist you in your latest project we have provided a convenient Quantity Calculator that will guide you through any job. Please note that this is only to be used as a guide.

Length in metres
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5-7mm Drainage Aggregate Tonnes
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5-7mm Drainage Aggregate Tonnes
(Measure the two sides that meet at the 90° angle)
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5-7mm Drainage Aggregate Tonnes