At a Glance

Dry Time: 60-minute

Mold Resistant

Use Location: Indoor/Outdoor

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How do I install this sealant?Is it safe for indoor use?Will this impede fire and smoke?What is the warranty on this product?Can I use it in walls and ceilings?

GREAT STUFF Fireblock 12-oz Smart dispenser Indoor/Outdoor Spray Foam Insulation Canister

Name: GREAT STUFF Fireblock 12-oz Smart dispenser Indoor/Outdoor Spray Foam Insulation Canister
Brand: GREAT STUFF
SKU: 1000645183
Price: 10.98 USD
Availability: InStock
Rating: 4.5 (368 reviews)

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4.5

368

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GREAT STUFF (1-Pack) Fireblock 12-oz Smart dispenser Indoor/Outdoor Spray Foam Insulation Canister

GREAT STUFF FIREBLOCK ELECTRICAL OUTLETS

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GREAT STUFF™ Fireblock Insulating Foam Sealant is a ready-to-use, minimal-expansion insulating foam sealant that fills and insulates gaps up to 1 inch to restrict airflow. This distinctly orange-colored foam seals electrical wiring run through wall studs as well as service penetrations in walls and between floors. *Intended for use in residential application to maintain the continuity of an approved fire block material

Approved Fireblock penetration sealant
Impedes spread of fire and smoke through service penetrations
Reusable for up to 30 days
UL Classified - Bright orange in color for easy code identification
Tested according to ASTM E84, ASTM E814 (modified), UL 1715
Smart Dispenser™ provides precision, control, reusability
Adheres to wood, metal, masonry, glass and most plastics
Forms a long-lasting, airtight and water-resistant barrier
Tack-free in 5-15 minutes; trimmable in one hour

General
Dry Color	Orange	Insulation Type	Closed cell
Series Name	Fireblock	Net Contents (oz.)	12
Type	Canister	Dry Time	60-minute
Use Location	Indoor/Outdoor	Dispenser Type	Smart dispenser

Features
Fire Resistant	No	Sound Barrier	No
Formaldehyde Free	Yes	Vapor Retardant	Yes
Mold Resistant	Yes	Water Resistant	Yes
Paintable/Stainable	Paintable/Stainable

Certifications
CA Residents: Prop 65 Warning(s)	No	GREENGUARD Gold Certified	No
ENERGY STAR Certified	No

Warranty
Warranty	None

Compatibility
For Use in Basements	Yes	For Use in Floors	Yes
For Use in Crawlspaces	Yes	For Use in Garage Doors	No
For Use on Plastic	Yes	For Use in Masonry	Yes
For Use on Metal	Yes	For Use in Plumbing	Yes
For Use on Wood	Yes	For Use in Vents	Yes
For Use in Ceilings	Yes	For Use in Walls	Yes
For Use on Insulation	Yes	For Use in Windows	No
For Use in Attics	Yes	Fits 2 x 4 Walls	Yes
For Use in Doors	No	Fits 2 x 6 Walls	Yes
For Use in Duct	Yes	For Use on Glass	Yes
For Use in Electrical	Yes

Dimensions
R-Value per Inch	3.7	Maximum R-Value	3.7

Miscellaneous
UNSPSC	30141500

Check out the Best Selling Spray Foam Insulation on Lowes.com

Review

4.5 out of 5

368 Reviews

93% Recommend this product

Ratings may include incentivized customer reviews.

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+ 10

What Customers Are Saying

The insulation is effective at sealing gaps and holes, especially around electrical wiring and vents. It is praised for its fireblock properties, providing added safety and security. The product expands well to fill spaces, and many find it easy to apply. However, some users experienced issues with the nozzle or dispenser clogging, and a few found the application process to be messy or wasteful. Overall, the insulation is considered a reliable and effective product, particularly for fire-related applications, though users should be mindful of the application process.

Customer review summary generated by AI, including incentivized reviews.

368 Customer Reviews

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++++

hope i never use it

HooksJune 22, 2026
Verified Purchaser

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Good

No fires yet

SteveJune 21, 2026
Verified Purchaser

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Works as expected

Would Recommend

Easy to use, more able to reuse than regular great stuff.

SlickJune 12, 2026
Verified Purchaser

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Easy to use and reuse.

Would Recommend

Works exactly as advertised.

T JonesJune 12, 2026
Verified Purchaser

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Good hole filler

Would Recommend

StretchJune 10, 2026
Verified Purchaser

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Great

Would Recommend

Great product and easy to use

Adam857May 26, 2026
Verified Purchaser

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GREAT STUFF Fireblock 12-oz Smart dispenser Indoor/Outdoor Spray Foam Insulation Canister

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