Bardon DrainAgg 20 sub-base material consists of crushed rock, concrete or blast furnace slag with well defined edges and free from clay or other deleterious material. Crushed gravel is not permitted. It is non-plastic when tested in accordance with BS1377, test no. 4.
R12/497 Granular material – manufactured
Bardon DrainAgg 20
Standard product features
4/ 20 mm granular stone to BS EN 13242:2002.