It'll be about 3-4m wide and a drop from concrete to floorboards of approx 2 inches at most. Though it's angled so starts at 2 inches one end, down to about an inch at the other.
Can I ask if there's any reason for hardboard over ply? Happy with whatever's most appropriate. I'd have assumed ply is more flexible/can tolerate changes in angle better?
I would probably chisel the concrete unless you can handle the dust from an angle grinder. It's possible you won't get a clean edge with a chisel though.
If you need to fill 1-2 inches across 3-4m how far into the floor will the slope stretch?
It'll be about 3-4m wide and a drop from concrete to floorboards of approx 2 inches at most. Though it's angled so starts at 2 inches one end, down to about an inch at the other.
Can I ask if there's any reason for hardboard over ply? Happy with whatever's most appropriate. I'd have assumed ply is more flexible/can tolerate changes in angle better?