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Insulation - Spray Foam

Spray polyurethane foam insulation applied to walls, roofs, tanks, and building assemblies — expanding in place to insulate, seal air leaks, and, in closed-cell form, add moisture resistance and structural rigidity in a single application. Find spray foam insulation contractors near you and connect with local providers through Scaffold Exchange.

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What Is Spray Foam Insulation?

Definition: Spray foam insulation, or spray polyurethane foam (SPF), is an insulation made by mixing two liquid components at the spray gun, which react and expand to many times their original volume as they are applied. The foam fills cavities, gaps, and irregular surfaces and cures into a continuous layer that both insulates and seals air leaks. SPF is installed in open-cell and closed-cell formulations, as well as higher-density roofing foams.

Open-cell spray foam is lighter and softer, expands significantly to fill cavities, and is commonly used for interior walls, ceilings, and sound control. Closed-cell spray foam is denser and more rigid, provides higher insulating value per inch, acts as a vapor retarder at sufficient thickness, and adds stiffness to the assemblies it is applied to. Roofing-grade foam is applied over roof decks and protected with a coating to form a seamless, insulated roof system.

Because SPF is created on site through a chemical reaction, quality depends on trained applicators, properly calibrated equipment, and control of temperature, humidity, and substrate conditions. Spray application also creates exposure hazards, requiring ventilation, respiratory protection, and controlled access during spraying and curing, and foam plastics in occupied buildings generally require a code-compliant thermal barrier. Industry training and guidance are provided by the Spray Polyurethane Foam Alliance (SPFA). Through Scaffold Exchange, you can find spray foam insulation contractors across the U.S. and compare their capabilities and availability.

What Spray Foam Insulation Services Include

Service offerings vary by contractor, but most spray foam insulation firms provide the following capabilities.

Open-Cell

Open-Cell Spray Foam

Lightweight foam that expands to fill wall and ceiling cavities, sealing air leaks and reducing sound transmission.

Closed-Cell

Closed-Cell Spray Foam

Dense, rigid foam with high insulating value per inch that resists moisture and adds stiffness to walls and roof decks.

Roofing

SPF Roofing Systems

High-density foam sprayed over roof decks and finished with protective coatings to create a seamless, insulated roof.

Industrial

Tank & Cold Storage Insulation

Spray foam applied to tanks, vessels, freezers, and cold storage buildings where continuous insulation is critical.

Protection

Thermal Barriers & Coatings

Thermal and ignition barriers and protective coatings applied over foam to meet code and protect it from UV and damage.

Common Applications & Project Types

Spray foam insulation is used in commercial, industrial, agricultural, and residential buildings throughout the United States.

Commercial walls, roofs, and metal buildings

Warehouses and distribution centers

Cold storage, freezers, and food processing

SPF roofing over existing roof systems

Tanks, vessels, and industrial equipment

Agricultural and livestock buildings

Multifamily and residential construction

Air sealing in energy retrofits

Spray foam is one of several insulation services. Here is how it compares to related services and which situations each suits best.

Insulation - Commercial

Insulation for commercial buildings

  • HVAC and plumbing piping and ductwork
  • Energy code and fire and smoke requirements
  • Preformed and wrapped materials
  • Best for offices, hospitals, and schools
Insulation - Mechanical

Insulation for mechanical systems

  • Piping, ductwork, tanks, and equipment
  • Designed by temperature and environment
  • Removable blankets for maintenance access
  • Best for any facility with mechanical systems
Insulation - Spray Foam ← You are here

Spray-applied polyurethane foam

  • Insulates and air seals in one application
  • Open-cell, closed-cell, and roofing foams
  • Conforms to irregular surfaces
  • Best for walls, roofs, tanks, and cold storage
Dust & Overspray Containment

Control of dust and overspray

  • Protects surfaces from foam overspray
  • Enclosures, sheeting, and masking
  • Important near vehicles and finishes
  • Best for spray work near occupied areas
Firestopping

Sealing penetrations and joints

  • Seals openings in rated walls and floors
  • Uses tested, listed firestop systems
  • Standard spray foam is not a firestop
  • Best for penetrations through rated assemblies

Find Spray Foam Insulation Contractors Near You

Use the Scaffold Exchange map to search by location, filter by service type, and connect directly with local contractors that install open-cell, closed-cell, and roofing spray foam.

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OSHA Compliance & Safety Standards

Spray foam application releases isocyanates and other chemicals that can cause respiratory and skin sensitization. OSHA's respiratory protection standard, 29 CFR 1910.134, requires a written program, proper respirator selection, fit testing, and training when respirators are needed, and applicators need skin and eye protection. Work areas should be ventilated and access restricted during spraying and for the re-entry period specified by the manufacturer. Spray foam work at height also requires compliant scaffolds and lifts.

  • Respiratory protection program with fit-tested respirators
  • Skin and eye protection for applicators and helpers
  • Ventilation during spraying and curing
  • Work area restricted until the re-entry time has passed
  • Thermal or ignition barriers installed where required by code
  • Surrounding surfaces protected from overspray
OSHA Standard 29 CFR
1910.134

Respiratory Protection — U.S. General Industry Regulations

OSHA Interpretations & Rulings →

Frequently Asked Questions

Spray foam insulation is spray polyurethane foam made by mixing two liquid components that react and expand as they are sprayed. It fills cavities and gaps, insulates, and seals air leaks in one application, and cures into a continuous layer on walls, roofs, tanks, and other surfaces.
Open-cell foam is lighter, softer, and expands more, making it economical for filling cavities and reducing sound. Closed-cell foam is denser and more rigid, has a higher insulating value per inch, resists moisture, and can act as a vapor retarder at sufficient thickness. The right choice depends on climate, assembly, and moisture conditions.
In most occupied spaces, building codes require foam plastic insulation to be separated from the interior by an approved thermal barrier, such as gypsum board, or in some attic and crawl space conditions an ignition barrier. Exterior and roofing foams also need coatings to protect them from UV exposure.
Use the Scaffold Exchange vendor map to search by your location and filter by service type. You can see which local contractors install spray foam insulation and SPF roofing, compare their capabilities, and contact them directly through the platform.
Spray foam applicators can be exposed to isocyanates and other chemicals, so OSHA's respiratory protection standard, 29 CFR 1910.134, applies along with personal protective equipment requirements. Ventilation and restricted access during spraying and curing are also important. Visit the OSHA website for full interpretations and rulings.
Standard spray foam insulation is not a firestop. Penetrations and joints in fire-rated walls and floors must be sealed with tested, listed firestop systems. Some specialty foam products are part of listed firestop systems, but only when installed exactly as the listing specifies.

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