Hi guys, I'm replacing an old upstairs chipboard floor - previous occupant had nailed it down and it didn't survive being taken up for re-wiring and plumbing. The chipboard was laid on 6x2 joists, 3m span, roughly 40cm separation. It will be carpetted once it's replaced, but room contains a sink, so some possibility of water spills. What I'm wondering about is why people generally use chipboard rather than plywood to lay such a floor? Is plywood actually a better material but chipboard is just cheaper?