About #4 stone
#4 stone is large, clean, angular crushed limestone running 1 to 2.5 inches. The pieces are washed, so there's no dust filling the gaps. Those big open spaces are the point: water runs straight through instead of pooling, which is why #4 is the stone you reach for when the job is about drainage.
It goes in drainage beds and dry wells, in large French drains, and along slopes and ditches where you need rock heavy enough to stay put and control erosion. It also shines on soft, wet ground. The stones are too big to sink in and press down, so they bridge into a stable mat you can drive equipment over, and the same idea makes #4 a good first layer under a driveway built over poor soil. If you're clearing out a wet, mucky area first, we rent roll-off dumpsters too.
Roll-Off Dumpster Rental