Closed Cell Spray Foam Insulation

Closed Cell Spray Foam Insulation for Shipping Containers

Closed-cell spray foam is one of the most effective ways to insulate a shipping container. Applied directly to the steel walls, cargo doors, and ceiling, it creates a seamless thermal and vapor barrier that helps control temperature, moisture, and condensation.

Choose between 2″ or 3″ insulation depending on how you plan to use your container.

Insulation Options

2″ Closed Cell Spray Foam — Approximately R-12 to R-14
A great choice for workshops, storage, and most conditioned spaces. Provides excellent insulation while keeping cost down.

3″ Closed Cell Spray Foam — Approximately R-18 to R-21
Recommended for offices, living spaces, and applications where maximum heating and cooling efficiency is important.

Closed-cell spray foam typically provides approximately R-6 to R-7 per inch.

Underfloor Insulation

Choose Interior + Underfloor for a more complete thermal envelope.

Underfloor spray foam helps:

• Reduce heat loss and heat gain through the container floor
• Keep floors warmer during cold weather
• Improve HVAC efficiency
• Reduce temperature differences between the floor, walls, and ceiling
• Improve comfort in offices and other regularly occupied spaces

For basic storage or applications where maximum climate control isn’t necessary, interior insulation without underfloor foam may be sufficient.

Key Benefits

• Excellent thermal performance
• Helps prevent condensation and moisture buildup
• Creates a continuous vapor barrier against the steel
• Adds rigidity and sound dampening
• Reduces heating and cooling demand
• Ideal for offices, workshops, studios, conditioned storage, and other container conversions

Professional Installation

Best value when installed before your container is delivered.

Installation on an existing container or mobile/off-site installation may also be available. Additional travel or mobilization charges may apply.

Need more than 3″ of insulation? Call or email us for pricing and recommendations.

Complete Your Build

We also offer framing, finished interior wall systems, electrical packages, HVAC, windows, doors, and other container modifications.