1 1/2 Inch Drain Rock (Size #4) Clean Wash Rock

Often called clean or wash rock, Size #4 Drain Rock runs from 1 1/2 inch down to 3/8 inch with no sand in the mix. Like all drain rock, the absence of fines is the whole point: the clean stone drains quickly and resists compaction, so it holds up in muddy ground and in any area affected by run-off or settling. The mid-range size makes it one of the most versatile drainage rocks for everyday use.

It is a popular all-around choice for driveways, parking areas, and landscaping, especially in spots that stay soft or wet. Spread over mud-prone ground, it gives a stable, free-draining surface that stops the churning and rutting you get when water has nowhere to escape. The clean, uniform size also leaves a neat, finished appearance wherever it is used on the surface.

Compared with the larger 2 1/2 inch drain rock, this grade is easier to spread and walk on and gives a tidier finish, while still moving plenty of water. That balance of drainage and a usable surface is why it suits both functional drainage layers and visible landscape areas. On wet Big Island sites where settling and run-off are common, it is a dependable fix.

Common uses:

• Driveways and parking areas
• Mud-prone and low, soft spots
• Run-off and settling areas
• Drainage layers and trenches
• Landscaping and ground cover

Good to know:

• Crushed rock from 1 1/2 inch down to 3/8 inch
• No sand, so it drains well and resists compaction
• Easier to spread and neater than 2 1/2 inch drain rock
• Doubles as a functional and a decorative surface

In stock now. Request a quote for 1 1/2 Inch Drain Rock delivery across the Big Island.