Over time, there's no reason it wouldn't. It's expanded polystyrene with an eco-friendly name, and anything that would degrade EPS would degrade these blocks. G

Over time, there's no reason it wouldn't. It's expanded polystyrene with an eco-friendly name, and anything that would degrade EPS would degrade these blocks. Groundwater is the big one I'd be concerned about. It being dug up and trashed by future earthworks projects would be the second big thing.