• Product Details
    GREAT STUFF PRO™ Gaps & Cracks Polyurethane Foam Sealant is a gun-applied, insulating foam sealant that expands up to 3 inches to take the shape of gaps, creating a long-lasting, water-resistant and fireblock seal around plumbing and electrical, in basements, attics, and more.
    • Expands to fill, seal, and insulate gaps up to 3 inch (76mm)
    • Reusable for 30 days when left attached to GREAT STUFF PRO™ Dispensing Gun
    • Forms a long-lasting, airtight, weather-resistant seal
    • Helps keep insects, moisture/condensation and allergens out
    • Adheres to wood, metal, masonry, glass and most plastics
    • Fireblock formulated
    • Interior/exterior use1
    • Tack-free in 3-10 minutes2; trimmable in one hour
    • Paintable, stainable and sandable
    • Orange-colored foam for easy inspection identification
    • UL classified

     1 Skin of cured foam can discolor if exposed to natural light. Paint or coat foam for the best results. 

    2 70 ± 5°F and 50 ± 5 % RH, 1-inch bead diameter, 6-inch length. The cure rate is dependent on temperature, humidity, and size of the foam bead. 

  • Q.

    Where can I use Great Stuff™ and Great Stuff Pro™ products?


    Great Stuff™ and Great Stuff Pro™ products can be used in a variety of interior and exterior applications, most commonly in air sealing and home retrofit applications.

    Where to use Great Stuff™ Big Gap Filler

    • Exterior openings
    • Hard to reach spaces
    • Rim joist
    • Pipe penetrations


    Where to use Great Stuff™ Fireblock

    • Pipe penetrations
    • Exterior of electrical outlets
    • Exterior of electrical penetrations
    • Pipe penetrations
    • Bathroom fans
    • HVAC penetrations


    Where to use Great Stuff™ Gaps & Cracks

    • Rim joists
    • Attic penetrations
    • Dryer vents
    • Pipe penetrations
    • Sill plates
    • Exterior of electrical outlets


    Where to use Great Stuff™ Multipurpose Black

    • Exterior of Electrical lines
    • HVAC penetrations
    • Small gaps and cracks in the attic or garage
    • Air conditioning lines, refrigerant lines, gas lines – service penetrations
    • Repair of masonry walls, sidewalks, and porches
    • Outdoor landscaping applications
    • RV and vehicle undercarriages3
    • Trailer/transportation repairs3
    • Marine sealing applications*

    *Note: Great Stuff™ Insulating Foam Sealants are not for use in aviation, or food/beverage contact, or as structural support in marine applications.

    Where to use Great Stuff™ Pestblock

    • PVC Pipe Penetration
    • Exterior of electrical cable lines
    • Water faucet penetration
    • Attic hatch frame
    • Rim joists
    • Sill plates


    Where to use Great Stuff™ Pond & Stone

    • Cap stones in retaining walls
    • Cracks and holes in trees
    • Rocks with direct water flow, such as waterfalls


    Where to use Great Stuff™ Window & Door

    • Doors and their rough openings
    • Windows and their rough openings


    Where to use Great Stuff Pro™ Gaps & Cracks

    • Electrical wire penetrations
    • Gas line penetrations
    • Plumping and pipe penetrations


    Where to use Great Stuff Pro™ Pestblock

    • Under baseboards and attic hatch frames
    • Hose bibs
    • Dryer vents
    • PVC pipe penetrations
    • Plumbing penetrations


    Where to use Great Stuff Pro™ Wall & Floor

    • Bonding Plywood and OSB subflooring to wood joists
    • Bonding foam panels, drywall, OSB and plywood to wood framing
    • Bonding masonry, tile and concrete substrates to OSB, plywood, foam panels and drywall


    Where to use Great Stuff Pro™ Window & Door

    • Windows and their rough openings
    • Doors and their rough openings

    What is the difference between Great Stuff™ and Great Stuff Pro™ products?


    There are two key differences between Great Stuff™ and Great Stuff Pro™ products:

    • Great Stuff™ uses a straw dispenser; Great Stuff Pro™ has both straw- and gun-applicator options to dispense foam.
    • Can sizes are larger with Great Stuff Pro™ series, so yield is greater.

    How do I get Great Stuff™ foam off of my skin?


    If the foam has not cured or hardened, use fingernail polish remover (with acetone); a polyglycol-based skin cleanser or corn oil may be effective. Then wash with soap and plenty of water. If the foam has hardened, there is no solvent that will remove it. It will not harm your skin and will wear off over time. To remove cured foam from skin, use a pumice stone (available at most drug stores) and warm, soapy water. Then apply petroleum jelly.


    Can I clean the Great Stuff™ Black gun?



    1. Unscrew used Great Stuff Pro™ from dispensing gun.
    2. Clean the gun basket and tip by generously spraying and removing uncured foam with Great Stuff™ Foam Cleaner.
    3. Invert the can and install the cleaner onto the dispensing gun.
    4. Press the trigger to flush the foam into waste receptable until only the cleaner is visible.
    5. Allow gun to sit for several minutes and repeat with a second flush.
    6. Remove the can from the dispensing gun and spray into waste receptacle without the can until the gun is completely empty.

    Can any Great Stuff Pro™ product be used as a fireblock for penetrations?


    Great Stuff Pro™ Gaps & Cracks Polyurethane Foam Sealant is a minimal-expanding, single-component polyurethane foam sealant for general purpose building envelope air sealing and retrofit applications. It has been tested and approved as an alternative fireblock material.

    • Great Stuff Pro™ Gaps & Cracks is bright orange colored foam for easy code identification.
    • Impedes spread of fire and smoke through service penetrations.
    • Recognized as an alternate fireblocking material for residential construction.
    • Tested according to ASTM E84, ASTM E814 (modified), UL 1715.
    • Seals service penetrations between floors.

    Fireblocking is defined by the International Building Code as the use of approved building materials installed in concealed spaces to resist the migration of fire and hot gases.

    Great Stuff™ Fireblock Insulating Foam Sealant impedes the spread of fire and smoke. It’s intended for use in residential application to maintain the continuity of an approved fire block material. Not to be used in firestop applications

    • Shake vigorously for a minimum of 60 seconds. If the can sputters, simply shake the can while held upside down.
    • Any uncured product that gets on the skin can be removed with acetone.  
    • Best results if used when product temperature ranges from 60-90°F (15-32°C). The can should not be exposed to temperatures more than 120°F. Cured foam should not be exposed to temperatures in excess of 240°F.
    • Firmly screw straw assembly onto valve and dispense SLOWLY.
    • Mist with water to speed cure.
    • Trim cured foam with serrated blade.
    • If applied outdoors, be sure to paint or cover foam to prevent discoloration and UV damage.

    If using GREAT STUFF PRO™ with the Foam Dispensing Gun, follow these additional steps before application:

    • With the can secured, set your desired bead size by adjusting the flow control knob on the back of the gun (bead can be adjusted from 1/8"-3"). Then, pull the trigger to fill the gun with foam, dispensing excess foam into an appropriate waste receptacle. Lastly, test the bead size before applying.
    • Tighten the flow control screw until fully closed for storage. Use can within 30 days of initial use.
    • Store upright with a foam dispensing gun attached.
    • Fill gaps <50%
    • Always leave a can of foam attached to the gun with the flow control screw closed.
    • When ready to change cans, shake the new can of foam for a minimum of 60 seconds.
    • NEVER leave a gun without a can of adhesive without a can of Great Stuff Pro™ attached unless the gun has been thoroughly cleaned with Great Stuff™ Foam Cleaner.

When to Use

Indoor/Outdoor Use

Attic Penetrations


Pipe and Plumbing Penetrations

Electrical Penetrations

Rim Joists

Sill Plate

HVAC Penetrations



There’s a solution for every seal. See what else GREAT STUFF™ has to offer. 

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Uses a flow-control mechanism that dispenses beads from 1/8” to 3” to provide greater precision and access to hard-to-reach areas..



Blocks critters, pests and insects. Seals gaps and cracks up to 3" where pests typically enter such as pipe and plumbing penetrations, dryer vents and more



Provides a fast-grab tack and long-term high-strength bond, even in conditions, leading to fast and reliable installations



Specifically formulated to stop drafts by air sealing the gap between the window or door frame and its rough opening