Where spray foam goes
Attics and roof decks, crawl spaces, basement walls, rim joists, exterior walls and barndominiums.
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Attic Spray Foam Insulation: Cost, Foam Types & Roof Deck Risks
Attic spray foam explained: attic floor vs roof deck, open- vs closed-cell, thickness, moisture risks, cost per board foot and what to ask before you hire.
Read the guide Updated October 19, 2026 -
Spray Foam Roof Deck Insulation: How It Works, Costs & Risks
How spray foam under the roof deck works: unvented attic rules, open- vs closed-cell by climate, moisture and leak risks, thickness and retrofit planning.
Read the guide Updated October 19, 2026 -
Vented vs Unvented Attic: Which Is Better With Spray Foam?
Vented vs unvented attics compared: how each works, when each is better, moisture risk, energy, cost and what converting an existing attic involves.
Read the guide Updated October 19, 2026 -
Crawl Space Spray Foam Insulation: Where to Apply It, Cost & Moisture Risks
Crawl space spray foam explained: walls of a sealed crawl space vs the floor above a vented one, closed- vs open-cell, moisture, thickness and cost.
Read the guide Updated October 19, 2026 -
Spray Foam Basement Walls: Best Foam, Cost & Moisture Risks
Can you spray foam basement walls? Closed- vs open-cell on concrete, moisture first, thickness, thermal barrier, cost per board foot and finished walls.
Read the guide Updated October 19, 2026 -
Spray Foam Rim Joists: Cost, Thickness & How to Insulate Them
How to insulate rim joists with spray foam: closed- vs open-cell, air-barrier thickness, where to spray, condensation risk, fire rules, DIY and cost.
Read the guide Updated October 19, 2026 -
Spray Foam Insulation for Exterior Walls: Types, Cost & Installation
Spray foam in exterior walls: open- vs closed-cell in 2x4 and 2x6 walls, new construction vs retrofit, moisture and vapor control, and how to specify the job.
Read the guide Updated October 19, 2026 -
Barndominium Spray Foam Insulation: Best Type, Cost & Condensation Control
Barndominium spray foam guide: closed- vs open-cell on metal panels, condensation and thermal bridges, living vs shop zones, thickness and cost.
Read the guide Updated October 19, 2026
More spray foam topics
- Foam types
- Costs & calculator
- Spray foam vs other insulation
- Problems & safety
- DIY spray foam
- Hiring a contractor
- Codes & technical
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