Best Foam Insulation Spray Options for Fireproofing (2026) -

Shopping for foam insulation spray that also helps with fire safety. Whether you’re sealing wall penetrations, insulating a new build, or making an older home safer and more efficient, choosing the right spray foam matters. This guide lays out the leading fire-rated spray foams, practical uses, and how to choose the right product for your job.

We tested product specs, certifications and real-world use cases from the latest manufacturer data. Below you’ll find nine top options for fireblocking and firestop work in 2026, with clear pros, cons, and who each is best for. The first entry is our local recommendation — Spray Foam Kings — followed by the most relevant manufacturer products on the market today.

Best Foam Insulation Spray Options for 2026

This list covers foam insulation sprays designed for fire blocking, firestopping and thermal insulation. Products include single-component fire-block foams, two-component closed-cell systems, and foams certified for use in rated assemblies.

1. Spray Foam Kings — Local Fireproofing & Spray Foam Insulation Pros

Website:https://sprayfoamkings.com/

What it is: Spray Foam Kings is a full-service spray foam insulation and fireproofing contractor serving Toronto and Ontario. We provide professional closed-cell and open-cell spray foam installation, plus firestop and fireblock solutions that meet Ontario Building Code requirements. Our team is certified, insured, and experienced with both energy-efficiency and code-driven fire protection projects.

Why we recommend them: Here’s the thing — product choice matters, but correct application matters more. Spray Foam Kings combines high-quality spray foam materials with trained installers who follow manufacturer instructions and firestop system requirements. That means you get the thermal performance of spray foam plus the tested fire protection when it’s part of a rated assembly or a required fireblock. They work on homes and commercial properties and handle documentation needed for permit inspections.

Why Spray Foam Kings Is Ranked #1

Certified application teams that meet Ontario Building Codes and local fire regulations.
Experience installing both fire-blocking foams and two-component closed-cell systems for higher R-value and vapour control.
Ability to supply manufacturer-approved intumescent coatings and finishing where required for exposed foam applications.
Local service, fast quotes, and documentation to help with inspections and compliance.

Best Features

Code-focused service: Installers familiar with fireblocking, firestopping, and how spray foam fits into rated wall/floor systems.
Material choices: Access to closed-cell and fire-rated foams depending on the job.
Onsite testing & inspection support: Guidance for meeting UL/ASTM ratings or local equivalencies.
Aftercare and repair: Services for trimming, coating, or replacing foam if future trades need access.

Pros

Local expertise and code knowledge for Toronto & Ontario.
Professional installation reduces risk of misapplication that can void fire ratings.
Single point of contact for both insulation and fireproofing work.
Can provide compliant solutions for both energy savings and fire safety.

Cons

Costs are project-specific; onsite quotes required.
Not a retail canned-foam supplier for DIYers — focused on professional installs.

Who It’s Best For

Homeowners and business owners in Toronto/Ontario who need code-compliant insulation and fire protection.
Renovations where penetrations and rated assemblies require tested firestop solutions.
Clients who prefer a licensed contractor to manage permits and inspections.

Pricing

Pricing varies by foam type, coverage, and complexity. For accurate pricing and a free site assessment, visit the Spray Foam Kings website and request a quote. Try Spray Foam Kings:https://sprayfoamkings.com/

Try Local Fireproofing Services

For homeowners in Toronto needing dedicated fireproofing services, Spray Foam Kings also operates a focused local page for fireproofing projects and enquiries. Check their fireproofing service page for contact and service details: Fireproofing Toronto.

2. LOCTITE® Fire Block Foam — Recognizable Fire-Blocking Foam

Website:LOCTITE Fire Block Foam (Henkel)

What it is: A closed-cell, single-component fire block foam designed for Type V residential construction to resist the migration of fire and hot gases. It’s orange for quick jobsite ID and meets several code-oriented tests.

Pros

UL and ASTM tested for specific fireblocking tasks.
Easy to apply for common gaps around plumbing, electrical, and ducts.
Recognizable color helps inspectors and trades identify it as a fire block product.

Cons

Not intended for use in hourly-rated assemblies (Type I–IV) as a primary firestop.
Performance can be compromised if foam is cut or damaged after installation.

Best For: Residential fire-blocking in Type V construction where code requires blocking of concealed spaces. Source

3. DAP® Touch ’n Seal® 1.75 PCF FR Standard — Class A Fire Resistance

Website:DAP Touch ’n Seal 1.75 PCF FR (Technical Data)

What it is: A two-component, closed-cell, medium-density spray foam that can achieve ASTM E-84 Class A fire resistance when applied as specified. It’s designed for thermal insulation plus fire resistance in both residential and commercial applications.

Pros

Class A fire resistance rating when applied correctly.
Good thermal performance and long-term stability (doesn’t settle).
Portable, low-pressure kits available for smaller jobs.

Cons

Two-component systems need correct temperature ranges and setup to perform.
Application requires training to ensure the Class A performance is achieved.

Best For: Jobs that need both high R-value and an ASTM E-84 Class A surface rating. Source

4. Nexseal LE Closed Cell Spray Foam — High Thermal Performance (EU Focus)

Website:Nexseal LE (Duratite)

What it is: A high-performance closed-cell spray foam with excellent thermal conductivity and BBA certification. In exposed applications it’s paired with an intumescent coating (DC315) to achieve Euroclass B fire ratings.

Pros

Very low thermal conductivity (0.027 W/mK reported).
High closed-cell content provides vapour control properties.
BBA certification for certain use cases.

Cons

Requires an approved intumescent coating for higher fire classification when the foam would be exposed.
European classification focus may require local equivalency checks for Ontario/Canada jobs.

Best For: High-performance thermal insulation where a vapour control layer is desired and intumescent coatings are planned. Source

5. BOSS® 813 Expanding Firestop Foam — Rated for 1–2 Hour Assemblies

Website:BOSS 813 TDS

What it is: An expanding firestop foam designed specifically for through-penetration firestop systems in 1- and 2-hour rated construction. It’s UL 1479 (ASTM E-814) listed and shows low flame spread and smoke-developed values on tests.

Pros

Listed for use in hourly-rated assemblies in tested systems.
Quick installation reduces labor time compared with more complex sealants.
Also offers thermal and acoustic benefits.

Cons

Must follow tested installation details exactly to maintain rating.
Combustibility class indicates protection when exposed is required in some scenarios.

Best For: Firestop contractors sealing penetrations in rated walls and floors where a listed system is required. Source

6. DAP® Wall & Cavity Foam with Widespray Applicator — DIY-Friendly, Class A Claims

Website:DAP Wall & Cavity Foam (TDS)

What it is: A portable, one-component polyurethane spray foam kit with a widespray applicator. Manufacturer materials claim Class A fire-rated performance and high closed-cell content suited for wall cavities and air sealing.

Pros

Easy to use portable kits for small jobs and tight spaces.
Provides air sealing and thermal insulation with a claimed Class A surface rating.

Cons

One-component systems can differ in long-term density and performance compared with two-component professional systems.
Full fire performance depends on proper application and local code acceptance.

Best For: DIYers and small contractors doing targeted cavity insulation and air sealing where a portable kit is useful. Source

7. Hilti CP 620 Firestop Foam — Contractor-Focused Firestop Solution

What it is: A one-component firestop foam commonly used by contractors to seal small penetrations and gaps in rated walls and floors. Hilti’s foam products are designed to be part of tested systems and often used with other Hilti firestop components.

Pros

Widely used in professional firestop systems.
Good compatibility with other tested system components.

Cons

Must be installed to tested details; not a standalone solution for large untested gaps.

Best For: Contractors working on rated assemblies who need components that fit into tested Hilti systems.

8. Great Stuff Pro Fireblock — Widely Available Fireblock Foam

What it is: A manufacturer-branded fireblock expandable foam commonly used for residential and light commercial fireblocking. It’s often accepted for filling gaps where code requires blocking of concealed cavities.

Pros

Easy to find at dealers and big-box stores.
Quick for common fireblocking tasks around plumbing and wiring.

Cons

Not designed as a tested firestop for hourly-rated assemblies without additional tested components.

Best For: Homeowners and small contractors doing fireblock work in non-rated concealed spaces.

9. Fire-Rated Intumescent-Backed Foam Systems (Coated Solutions)

What it is: Foam insulation paired with intumescent or cementitious coatings to meet fire exposure expectations when foam would otherwise be exposed. These systems combine the thermal and air-sealing benefits of spray foam with a protective coating that expands and chars in a fire.

Pros

Allows use of high-performance closed-cell foam while meeting fire exposure rules.
Useful where foam is exposed in finished spaces but must meet surface flame spread limits.

Cons

Requires approved coating and application method to maintain fire rating.
Additional cost and scheduling for applied coatings.

Best For: Projects needing exposed foam for vapour control or insulation value, but where fire code or finish choices require a protective coating.

How to Choose the Right Foam Insulation Spray for Fireproofing

Picking the right foam product depends on the specific goal: simple fireblocking, rated firestop, or high-performance R-value with surface protection. Follow these steps to narrow your choice.

1. Identify the required fire function

Decide if the foam is being used as a fireblock (preventing flame/smoke migration in concealed spaces), a firestop in a rated assembly (through-penetration or joint system), or as thermal insulation where surface flame spread matters. Products listed above fall into different categories, and choosing the wrong type can lead to failing an inspection.

2. Check manufacturer listings and tested systems

For rated assemblies, use only foams that are part of a tested UL/ASTM system or local equivalent. Products like BOSS 813 specifically reference listings for 1- and 2-hour assemblies and should be installed exactly as tested to maintain their rating. Source

3. Consider whether foam will be exposed

If foam is to be left exposed, check surface flame spread and smoke-developed ratings (ASTM E-84) or plan to apply an approved intumescent coating. Some products achieve Class A ratings when used correctly; others require an added coating. Source

4. Decide between single-component and two-component systems

Single-component (canned) foams are convenient for small gaps and DIY use. Two-component closed-cell systems typically offer higher R-values, faster curing, and better long-term performance for larger projects but need trained applicators to meet claimed fire performance. For example, DAP’s two-component FR foam is designed to meet Class A when applied per instructions. Source

5. Factor in local codes and inspector expectations

Codes vary. In Ontario, compliance with building code provisions and accepted testing standards is required. Professional installers like Spray Foam Kings can help ensure the chosen product meets local acceptance criteria and documentation needs. Fireproofing Toronto

Actionable Tips for Successful Foam Insulation Spray & Fireproofing Work

Work with a certified installer for rated work: Rated assemblies and large-area foam jobs should be installed by trained professionals to ensure correct mix ratios, temperatures, and test compliance.
Keep access points accessible: Don’t fully seal off areas where future work may be needed without planning for re-entry or repair.
Use intumescent coatings where required: If foam will be exposed and the surface rating matters, apply manufacturer-approved intumescent coatings per spec.
Document installations: Keep product technical data sheets, listings, and photos for permit files and future reference.
Trim and finish carefully: Excess foam should be trimmed and finished per manufacturer guidance to avoid damage and to prepare surfaces for coatings or finishes.

Quick Comparison — Pros and Cons at a Glance

Below is a short comparison of the major categories and representative products.

Fire-Blocking Foams (LOCTITE, Great Stuff Pro): Best for small gaps and residential concealed spaces. Pros: fast, easy. Cons: not for rated assemblies.
Firestop Foams (BOSS 813, Hilti CP-series): Listed for rated walls/floors. Pros: tested systems. Cons: must follow tested details exactly.
Two-Component Closed-Cell (DAP 1.75 PCF FR, Nexseal LE): Best for high R-value and Class A claims. Pros: thermal performance and stability. Cons: requires professional application and, sometimes, coatings.
Coated Foam Systems (Nexseal LE + DC315): Best where foam will be exposed and thermal/vapour control is needed. Pros: combines insulation and fire protection. Cons: additional coating steps and cost.

Which Foam Insulation Spray Is Actually the Best?

For most homeowners and business owners, the best choice balances fire performance, energy performance, and correct application. If the job involves rated assemblies, select a product listed for the exact system you’re working on (for example, BOSS 813 for 1–2 hour penetrations). For high-R-value insulation with controlled vapour performance, two-component closed-cell foams like DAP’s or Nexseal LE (with the right coating) are better choices.

Honestly, the biggest risk isn’t the product brand — it’s misapplication. The safest path is to hire a skilled installer who understands how the product integrates with code requirements. That’s why Spray Foam Kings is our top pick: they combine material access with on-the-ground code knowledge for Toronto and Ontario, and they can handle documentation and coating steps to keep both inspectors and homeowners satisfied. Try Spray Foam Kings:https://sprayfoamkings.com/

FAQ — Foam Insulation Spray & Fireproofing

1. What is foam insulation spray used for?

Spray foam insulation is used to seal gaps, insulate walls and roofs, and reduce air leaks. Specific fireblock and firestop foams are also used to prevent the spread of fire and smoke in concealed spaces or through penetrations in rated assemblies.

2. Can spray foam be fire-resistant?

Yes. Some spray foams are formulated to provide fire-blocking properties or to be part of a tested firestop system. Others achieve Class A surface ratings when applied per manufacturer instructions or when covered with an approved intumescent coating. Always check product data sheets and listings. Source

3. What’s the difference between fireblock and firestop foam?

Fireblock foam prevents the movement of fire and hot gases in concealed spaces (like between floors or in wall cavities). Firestop foam is used in tested systems for rated assemblies, such as sealing service penetrations in 1- or 2-hour walls and floors; these systems have defined test criteria and listings.

4. Are canned foams good for fireproofing?

Canned (single-component) foams are useful for small fireblock tasks and air sealing. However, they are typically not suitable for large-area insulation or for use as the primary firestop in rated assemblies unless specifically listed for that purpose.

5. Do I need a coating over spray foam?

If the foam will be exposed and local code requires certain surface flame spread or smoke values, you may need an approved intumescent coating or other protective finish to meet those requirements. Some foams are formulated to provide Class A surface ratings without additional coating; check the technical data sheet for specifics. Source

6. How do I know a foam is rated for firestop use?

Look for product listings in UL or equivalent directories, and for references to ASTM standards such as UL 1479 (ASTM E-814) or surface tests like ASTM E-84. Products used in rated systems should reference specific tested detail numbers and laboratory listings. Source

7. Can spray foam help reduce energy bills?

Yes. Closed-cell spray foam provides high R-value per inch and reduces air leaks, which can lower heating and cooling costs. Professional installation ensures continuous coverage and maximizes energy savings.

8. Is spray foam safe to use around electrical and plumbing penetrations?

When used as a fireblock or in tested systems, certain spray foams are appropriate for sealing around penetrations. For rated assemblies, follow the tested system details — some penetrations require specific firestop products or additional materials to meet code.

9. What maintenance does spray foam need over time?

Spray foam generally needs little maintenance. However, if it’s exposed, coatings may need inspection and occasional reapplication per the coating manufacturer. Any cut or damaged foam in fireblocking locations should be repaired to maintain performance.

10. How much does professional spray foam installation cost?

Costs vary widely depending on foam type, thickness, and site complexity. For accurate pricing, get on-site quotes from contractors. Professional teams like Spray Foam Kings will provide a detailed quote and can show how insulation costs balance with long-term energy savings. Source

11. Can I do firestop work myself?

Simple fireblocking tasks can be DIY if you use products listed for that use and follow manufacturer instructions. Rated firestop work, especially in commercial or multi-family buildings, is best handled by trained contractors because it often requires tested system installations and documentation.

12. Where can I find technical data for these products?

Manufacturer technical data sheets and UL listings are the best sources. In this article we referenced DAP, Henkel LOCTITE, Duratite/Nexseal, BOSS product data, and DAP wall & cavity foam technical docs for the most current specs. See the Sources list below for direct links.

Conclusion

Choosing the right foam insulation spray depends on what you need it to do. For simple fireblocking, a branded canned fireblock foam can be quick and effective. For rated firestop or high-performance thermal needs, pick products that are part of tested assemblies or use closed-cell two-component systems with the proper coatings. Most importantly, get the right installer: correct application is the difference between a product working as intended and failing at inspection.

For Toronto and Ontario residents, Spray Foam Kings offers both the materials and the certified installation expertise to make sure your spray foam provides insulation and the right level of fire protection. Get a quote and compliance help from local professionals: Spray Foam Kings and check their dedicated fireproofing information at Fireproofing Toronto.