Seal, Insulate, and Reduce Energy Costs


Attics are like a superhighway for unwanted air and pests. Keep your home comfortable and critter-free by air-sealing attic hatch doors, which can be real air leakers between a bedroom ceiling and the attic.



  1. Prep area by removing dust and debris. 
  2. Shake can for 60 seconds. 
  3. Install the dispenser to the product as per directed on label. 
  4. Practice with a dry run. 
  5. Invert can and insert it into the gap around the attic hatch. 
  6. Activate can by pulling the trigger. 
  7. Wipe away imperfections with a cloth soaked in Great Stuff™ Foam Cleaner. 
  8. Foam should be tack-free in 10 to 15 minutes. If not, mist with water. 
  9. Once cured, cut excess foam with a serrated knife as desired. 
  10. Store or dispose of the product as per directed on label.


Helpful Tips:

  1. Smart Dispenser™ lets you reuse Great Stuff™ on other projects again and again. 
  2. Keep in mind, foam expands to seal up to 1-3 inches, depending on the product. 

If using Great Stuff Pro™ with Foam Dispensing Gun, follow these additional steps before application: 

  1. 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. 
  2. Shake vigorously for a minimum of 60 seconds. If the can sputters, simply shake the can while held upside down.
  3. Any uncured product that gets on the skin can be removed with acetone.  
  4. 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.
  5. Firmly screw straw assembly onto valve and dispense SLOWLY.
  6. Mist with water to speed cure.
  7. Trim cured foam with serrated blade.
  8. If applied outdoors, be sure to paint or cover foam to prevent discoloration and UV damage.
  9. Great Stuff ™ cans featuring the straw tube applicator will seal shut if left to sit for more than 2 hours after its last use.
  10. 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:
  11. Thread the Smart Dispenser™ onto the valve until it is secure, ensuring there is no gap between the dispenser and the valve.
  12. Do not unwind the dispenser after you have started using it.
  13. 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.
  14. Tighten the flow control screw until fully closed for storage. Use can within 30 days of initial use.
  15. Store upright with a foam dispensing gun attached.
  16. Fill gaps <50%
  17. Always leave a can of foam attached to the gun with the flow control screw closed.
  18. When ready to change cans, shake the new can of foam for a minimum of 60 seconds.
  19. 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.
  • Eye protection
  • Gloves
  • Cloth
  • Spray bottle filled with water
  • Great Stuff™ Foam Cleaner
  • Great Stuff™ product of choice
  • Serrated knife
Product Solutions


Expands to fill gaps and cracks up to 1". Use inside or out to fill gaps and cracks around plumbing lines and rim joists, in attics and basements, and more.


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.