I intend to concrete the rear yard of my old terrace house with a stormwater drain, to improve the drainage and prevent some of the moisture that currently seeps under the house.
I wish to build a raised garden bed in one section probably using sleepers in a rectangle. Does anybody know of any type of grating that I can use at the base of the bed that would be strong enough to support the sleepers off the ground but also hold pebbles and gravel to allow the soil to be drained but not lost?