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Foam Gap Filler and Fire Seal

Great Stuff Pro Gaps & Cracks (and Fire block)

Foam Great Stuff Pro Gaps Cracks 

GREAT STUFF PRO™ Gaps & Cracks Insulating Foam Sealant meets the following fire blocking standards:
• ASTM E84 – Standard Test Method for Surface Burning Characteristics of Building Materials
• ASTM E814 (modifed) – Standard Test Method for Fire Tests of Through- Penetration Fire Stops
• CAN/ULC S102 – Method of Test for Surface Burning Characteristics of Building Materials and Assemblies

Note that depending on your particular code jurisdiction there may be a limit on the size of hole that the foam can fire seal.  It could be limited to 1/2" gaps in some areas.

http://www.ebay.com/itm/Dow-Great-Stuff-Pro-Gaps-and-Cracks-24-oz-Gun-Foam-Case-of-12-341557/121858426621?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20131003132420%26meid%3De7c7298c18c44fc4822b357ac437b508%26pid%3D100005%26rk%3D4%26rkt%3D6%26sd%3D121858426726    $105 for 12  ($8.75 each)


http://www.amazon.com/Dow-Great-Stuff-Cracks-341557/dp/B0013WME6C    $8.99 + $4.50 shipping (luckily shipping cost does not go up linearly)

http://www.homedepot.com/p/GREAT-STUFF-PRO-24-oz-Gaps-and-Cracks-Insulating-Foam-Sealant-341557/202892471     $12.47



Where you have lots of gaps to fill in one go then it is actually less expensive to use the one-use cans.

GreatStuff Gap Filler 16oz 

http://www.homedepot.com/p/GREAT-STUFF-16-oz-Gaps-and-Cracks-Insulating-Foam-Sealant-162848/100003351        $3.98 for 16oz

Lowes has it for $3.68


I use three different types of foam depending on how much expansion I want...
    No expansion - Foam Adhesive
    Small expansion - Foam Windows and Doors
    Large expansion (and fire seal) - Foam Gap Filler and Fire Seal

This is for use with a Foam Gun .
You also need Foam Gun Cleaner .



GREAT STUFF PRO™ Gaps & Cracks - As the first foam sealant to be recognized as a fireblock, GREAT STUFF PRO™ Gaps & Cracks inhibits the spread of flames through concealed spaces. It’s a minimal-expanding, single component polyurethane foam sealant for general purpose building envelope air sealing.