insulation
Rigid XPS foam (extruded polystyrene)
Closed-cell extruded polystyrene foam boards, typically pink/blue/green. Used as continuous insulation outside the framing or below slabs.
Cost tier
MID
Cost / sqft
$0.7–$2
Install
trade
Durability
high
Maintenance
low
Moisture
excellent
Cost notes
1" or 2" boards taped at seams provide continuous insulation outside studs — major thermal-bridge reduction.
Aesthetic
- Finish: concealed
- Color range: pink, blue, green
- Visual weight: light
Climate suitability
✓ Hot-humid
✓ Hot-dry
✓ Mixed-humid
✓ Mixed-dry
✓ Cold
✓ Arctic
Source
Architectural Graphic Standards — Architectural Graphic Standards (Ramsey/Sleeper) — Materials chapter
Tags: XPS, rigid-foam, continuous-insulation