Foam Gap Filler and Fire Seal
Great Stuff Pro Gaps & Cracks (and Fire block)
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.amazon.com/Dow-Great-Stuff-Cracks-341557/dp/B0013WME6C $8.99 + $4.50 shipping (luckily shipping cost does not go up linearly)
Where you have lots of gaps to fill in one go then it is actually less expensive to use the one-use cans.
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.