The shallowest grid we make. Less digging, less stone, less muckaway. The IBRAN®-X30 is built to the same spec as our deeper grids: same recycled material, same closed-cell base, same 25 year warranty. It just holds a shallower layer of stone, which makes it the grid to reach for when you can't dig deep or don't need to. Finishes at around 50mm including overfill. Laying over existing concrete or tarmac? That 10mm saving against a 40mm grid is often the difference between clearing a garage door, threshold or DPC and not. Roughly a quarter less fill than a 40mm. Less to buy, less to cart away, less to top up. On a big drive that's real money off the quote. Fill it with a 6-20mm graded blend, angular and clean. A blend beds in tighter than a single size because the smaller stone fills the gaps. That's what you want: a full cell puts the load through the stone and into the ground, not through the plastic. Skip anything rounded or dusty. Push-fit, four to the square metre, cuts with a hand saw. Works just as well filled with a sand-based rootzone for grass parking and garden access. Which depth? IBRAN®-X30 if levels are tight or you're laying over an existing surface. IBRAN®-X40 for a standard driveway. IBRAN®-X50 if you're working to a drawing or the grass needs to properly recover between uses.