When you need rocks for a hardscape project but don’t want the weight, expanded polystyrene is an excellent choice
Geofoam - Wikipedia
kwangho lee carves foam for EPS grotto / seoul pavilion project
Eps Geofoam Overview, PDF, Polystyrene
Expanded polystyrene (EPS) geofoam vs. traditional fill
5 Differences Between Styrofoam Blocks and EPS Foam Blocks
EPS Foam used to create realistic Rock Formation
From Time to Cost Savings, Here Are 5 Reasons Contractors Need EPS
Can Foam Insulation Be Too Thick? - GreenBuildingAdvisor
What is Geofoam - Geofoam International
Geofoam and Void Fill Solutions, Pacific Northwest: Airfoam EPS
EPS Foam blocks to create giant rock formation
What is Geofoam - Geofoam International
Create Rocks and Caves using EPS Foam