• Product Details
    GREAT STUFF™ Gaps & Cracks Insulating Foam Sealant is a ready-to-use, minimal-expansion insulating foam sealant that expands up to 1 inch to take the shape of gaps, creating a long-lasting, airtight and water-resistant seal around plumbing and electrical, in basements, attics, and more.
    • Expands to fill, seal, and insulate gaps up to 1” (25mm).
    • Forms a long-lasting, airtight, water-resistant seal.
    • Helps keep insects, moisture/condensation and allergens out (GS-121)
    • Adheres to wood, metal, masonry, glass and most plastics
    • Interior/exterior use1
    • Tack-free in 5-15 minutes2; trimmable in one hour
    • Paintable, stainable and sandable (GS-120)
    • Cream-colored foam
    • 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.

    What is Great Stuff™?


    Great Stuff™ is the brand name for a line of one-component insulating foam sealants that can help make your home more comfortable and energy efficient by sealing the gaps and cracks where air conditioned and heated air escape. Great Stuff Pro™ Polyurethane Foam Sealants can be used for both small and large air sealing and retrofit applications by DIY’s or professionals. Great Stuff™ comes in cans with a straw applicator or the new patented Smart Dispenser™.  Cans are in 12, 16, and 20 oz sizes. Great Stuff Pro™ series is available in larger cans (20,24, & 30 oz sizes) and use the dispensing guns to apply.


    Can Great Stuff™ products be used outdoors?



    Great Stuff™ and Great Stuff Pro™ products can be used outdoors. However, cured foam will discolor if exposed to ultraviolet (UV) light. If left exposed, the foam will eventually crumble. Paint or coat foam for best results in outdoor applications.

    Great Stuff Pro™ Gasket is not approved for used outdoors


    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.


    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 Great Stuff Smart Dispenser™?


    The Smart Dispenser™ from the Great Stuff™ brand is a game-changing, industry best dispenser for one component can sealants.

    Addressing all of the pain points of standard straw dispensers, the Smart Dispenser™ uses integrated mechanical parts to improve the user experience with Great Stuff Insulating Foam Sealants:

    • Reusable up to 30 days; use it again and again!
    • No dripping; the foam stops as you stop, as the trigger is released the foam ceases to dispense.
    • Increased precision with more control and less mess, air seal with ease with the Smart Dispenser™.
    • 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.
    • Great Stuff ™ cans featuring the straw tube applicator will seal shut if left to sit for more than 2 hours after its last use.

    If using GREAT STUFF™ SMART DISPENSER™, follow these additional steps before application:

    • Great Stuff™ cans featuring the Smart Dispenser™ may be reused up to 30 days with the straw left attached to the canister, just clean the tip after your first use. 
    • For best results:
      • Thread the SMART DISPENSER™ onto the valve until it is secure, ensuring there is no gap between the dispenser and the valve.
      • Do not unwind the dispenser after you have started using it.
      • Let up on the trigger slowly to release pressure in the straw and prevent spurts during the next use and to achieve the most consistent bead.

When to Use

Attic Penetrations


Electrical Penetrations

HVAC Penetrations

Indoor/Outdoor Use

Pipe and Plumbing Penetrations

Rim Joists

Sill Plate



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Expands to fill gaps up to 3”. Use inside or out to fill big gaps and cracks around plumbing lines and rim joists, in attics and basements, and more


A flexible, low-pressure formulation for sealing between window and door frames and their rough openings. When applied properly, it won’t bend or bow the framework. 


Blocks critters, pests and insects. Seals gaps and cracks up to 1" where pests typically enter such as pipe and plumbing penetrations, dryer vents and more.


Helps impede the spread of fire and smoke through service penetrations between floors, electrical outlets and runs through wall studs, pipe, cable, duct penetrations and more.