**Europe**:
- Builders' merchants (Hornbach, Bauhaus, Praxis, Brico Dépôt) for XPS insulation panels
- Local packaging suppliers for EPS — search "EPS blok" / "Styropor block" + your city
- Modulor (DE), Krick (DE), Brouwers (NL) for model-quality blocks
**US**:
- Lowes / Home Depot for XPS "Foamular" insulation
- FoamFactory.com, FoamOrder.com for big custom blocks
- Local packaging supply houses for EPS — they often sell direct
Rule of thumb: any foam labelled for building insulation is cuttable. Avoid anything labelled "closed-cell PU" — that's the polyurethane stuff that chars.
- Builders' merchants (Hornbach, Bauhaus, Praxis, Brico Dépôt) for XPS insulation panels
- Local packaging suppliers for EPS — search "EPS blok" / "Styropor block" + your city
- Modulor (DE), Krick (DE), Brouwers (NL) for model-quality blocks
**US**:
- Lowes / Home Depot for XPS "Foamular" insulation
- FoamFactory.com, FoamOrder.com for big custom blocks
- Local packaging supply houses for EPS — they often sell direct
Rule of thumb: any foam labelled for building insulation is cuttable. Avoid anything labelled "closed-cell PU" — that's the polyurethane stuff that chars.