insulation

Closed-cell spray foam

Two-part polyurethane foam sprayed in cavities, expanding to fill every void. Highest R-value per inch (R-6.5-7); functions as air barrier + vapor retarder.

Cost tier

PREMIUM

Cost / sqft

$3–$7

Install

specialty

Durability

premium

Maintenance

low

Moisture

excellent

Cost notes

Dramatic envelope improvement; specialty crew + careful install to avoid off-gassing issues. Required vapor management strategy.

Aesthetic

Finish: concealed
Color range: beige to amber
Visual weight: light

Climate suitability

✓ Hot-humid

✓ Hot-dry

✓ Mixed-humid

✓ Mixed-dry

✓ Cold

✓ Arctic

Code notes

Class A or Class I fire-rated thermal barrier required (15-min fire barrier per IRC R316).

Source

Architectural Graphic Standards — Architectural Graphic Standards (Ramsey/Sleeper) — Materials chapter

Tags: spray-foam, closed-cell, air-barrier, premium