Archicad — Hatch

Archicad treats insulation (like fiberglass) as a special "Air space" or requires a specific Building Material named "General Insulation." Solution: Assign the pre-installed "Glass Wool" hatch (which has a zigzag pattern) to your insulation layer's Cut Fill.

Even experts get frustrated when hatches behave weirdly. Here is your checklist: archicad hatch