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Internet #207077797

Model #99053992

Store SKU #1001869301

16 oz. Fireblock Insulating Foam Sealant with Quick Stop Straw

  • Mess-free dripping is ensured with quick-stop straw technology
  • Specially formulated for curbing fire spreads and smoke
  • Provides excellent adhesion to building materials
  • See More Details

Frequently Bought Together


Product Overview

GREAT STUFF Fireblock Insulating Foam Sealant with Quick Stop Straw Technology can save much more than energy costs. By sealing the pipe, cable and duct penetrations, you minimize airflow. During a fire, that means flames, harmful gasses and toxic smoke cannot spread as quickly. And in an emergency, that could make all the difference. The fact that it helps you conserve energy, reduce drafts and save on heating and cooling costs is great too.
  • New quick stop straw technology - helps stop messy foam drips
  • Impedes spread of fire and smoke through service penetrations
  • Recognized as an alternate fire blocking material for residential construction; tested according to ASTM E84, ASTM E814 (modified), UL 1715
  • Seals service penetrations between floors and electrical runs through wall studs
  • Airtight, water-resistant and has exceptional adhesion to building materials
  • Tack free in 6 minutes; trims in 30 minutes; cures rigid in 8 hours
  • Bright orange colored foam for easy code identification
  • Click here to learn more about Eco Options and Energy Efficiency

Info & Guides

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Coverage Area (sq. ft.)
Product Height (in.)
Product Width (in.)


Compatible Install Surface
Cement,Concrete,Existing Insulation,PVC/CPVC Pipes,Plywood,Wood
Cure Time (hours)
Dry to touch (min.)
Install Temperature (F)
Insulation Features
Fire Block Rated,Paintable,Stainable
Insulation R-Value
Insulation R-Value per Inch
Insulation Type
Spray Foam Insulation
Number of Pieces
Product Weight (oz.)
16 oz

Warranty / Certifications

Warranty Information

Questions & Answers


Is it ok to use this around a door frame or will it expand too much and bow the frame? I know th...

Asked by Grillman May 19, 2021

Excessive application around the door frame will greatly expand and will definitely do some bow bending. So therefore, limit and slowly apply very little foam.

Can I use this to seal around recessed lights in the attic?

Asked by Christopher March 17, 2021

Got the job done.

Can Great Stuff Fireblock be used to seal the gap around a bathroom ceiling vent fan sheet metal ...

Asked by Bones March 13, 2021

You can use Great stuff fire to seal the gap between the housing and the Sheetrock.

How much is a case of spray insulation fire block

Asked by madness March 7, 2021

Dear Madness: Please be aware that the "Fireblock" version of Great Stuff is just as flammable as all of the other versions of Great Stuff. The cured foam will ignite at just 240 degrees F -- which is much lower than the ignition temp for paper or wood. This is also true for other canned spray foams with "Fireblock" on the label, e.g. 3M. If you use this foam to seal penetrations in framing, e.g. around holes drilled for pipes or electric lines, it will catch fire before the wood does. In short, it will promote fire. This type of foam is banned for fire blocking in commercial buildings, and is only permitted in residential buildings due to a 'gap' in the building code. If the local inspector approves, it is "OK". If the inspector is aware of the problems, you could spend costly hours digging out foam and replacing it with real fire resistant sealant. Much better to start with the right stuff. We recently finished a job and when the inspector walked though he just smiled, "You avoided a common problem!" Use real fire resistant sealant for fire blocking, e.g. 3M Model # CP25WB+10, Home Depot Internet #100166701,UPC Code # 051115116384, Store SKU #163096 If the gap is too big for sealant alone, pack it with rock wool, then cover it with the 3M sealant. I hope this is helpful. Mark

Hi. Which foam can i safely use around heating pipes? Thanks

Asked by Vas February 12, 2021

Dear Vas: DO NOT use Great Stuff spray foam, despite "Fireblock" on the label. These canned spray foam products are very flammable. The cured foam will ignite at just 240 degrees F - which is signifcantly lower than the ignition temp of paper or wood. This means the the foam will ignite first and promote combustion. The hole that heating pipes pass through are typically penetrations that must be "fireblocked". The best solution is fire resistant caulk, which is easy to apply. See: 3M CP 25WB, Home Depot Internet #100166701, UPC Code # 051115116384, Store SKU #163096 You will need a cheap caulk gun to apply it; Home Depot sells them for $4. If the gap is larger than ~1/4", pack it first with rock wool or steel wool, pushed a bit below the surface. Then cover the wool with 3M sealant. Steel wool will also keep mice from chewing through the hole. I hope this is helpful. Mark

I asked this question earlier today: I live in a 1st floor apartment where plaster dust constant...

Asked by GB January 12, 2021

It worked great for what I needed. I am redoing my chimney and used it to cover some open spots. Dried fast and cleaned off what I didn't need. Would suggest it to anyone.

I live in a 1st floor apartment where plaster dust constantly accumulates on whatever is undernea...

Asked by GB January 11, 2021

Dear GB: Without a photo of the pipes in your apartment, it is difficult to offer a solution. Please post another question with a photo of the pipes. For now, if the plaster dust accumulates only under the holes where the pipes enter the ceiling, sealing the gap around this hole should be helpful. Great Stuff is not the solution, however. It expands aggressively, sticks to everything and cannot be removed with any standard solvent. Depending on the width of the gap, DAP 230 sealant would be best. This water-based sealant is easy to apply with a cheap caulk 'gun', and easy to clean up. It is available in white, which will probably match the color of your ceiling. If the gap around the pipes is larger than ~1/4", pack the space first with steel wool - pushed in so that you can cover it with DAP 230. All of these products are carried by Home Depot, and are not expensive or difficult to use. If you have never used a caulk gun, they are very simple. Look up "How to use a cuilk gun" on the web. They include a trimmer to cut the top off the DAP 230 tube, and a fold-out wire to poke in the seal inside. Wipe the wire clean with a paper towel before you move it back in place -- or it will be glued in place by the sealant. A photo of a caulk gun is attached below; they cost $4. I hope this is helpful. Mark

Can this be used to replace the insulation in an electric stove? Mice have gotten in the insulati...

Asked by Minne January 4, 2021

I think that you will need to replace the stove. The heating will cause the odor and it will not stop until it is completely burned away. Good luck with that.

Would this work to insulate a 20 lb. propane tank to keep it from freezing? I want to build a bo...

Asked by Eric December 28, 2020

Yes. Tighter the box, the better.

Can this be used to fill a door to make fire resistant?

Asked by Nick December 20, 2020

Great question. This would make the door a little more fire resistive than what it currently is now. But as an architect, I can tell you that there is much more that goes into it than filling the door with foam. This jury-rigged door would resist fire slightly longer than the existing hollow core door, but would melt and burn through. I would rather suggest that you buy yourself a sold core door, quality door hardware, quality fire door seals, and a closer. That would give yourself some quality fire protection.

16 oz. Fireblock Insulating Foam Sealant with Quick Stop Straw - page 2

Customer Reviews

  • 4.2
    out of 337 reviews
  • 86% recommend this product
Filter by:
Showing 1-10 of 337 reviews
Help to protect
Help to protect
by Thebatzon78
useing this was better than old straight through nozzle ....secured a electric fireplace insert s...
useing this was better than old straight through nozzle ....secured a electric fireplace insert strategically. blocked flume in chimney with pink and fireblock to secure
by 12mileman
Listen to control the flow; 1 oz./linear foot
I bought this a while ago, and finally found/made the time to use it. 1) mist all of your potential work areas first with water; although it is possible to reuse the same disposable spray straw with 2 cans, you need to empty the can once you start spraying, else the straw dries out; 2) plan on 1 oz./linear foot; I sprayed four 16 oz. cans on the 1st floor joists above our unfinished basement, and it covered about 58 linear feet (although I sprayed it on a bit thicker than planned/anticipated until I figured it out); 3) I found that the best way to regulate the flow was to listen for the sound of the propellant gas escaping—the slower it escaped (up to a 5-10 second delay before the foam started flowing), the better I was able to control it, especially when the pressure was high with a new can; 4) wear gloves and eye protection, and let it dry before you try to clean up (then spills just popped off the concrete floor); 5) fill in large gaps with wood scraps before spraying, and it may take a few sprays (allowing drying time in between) to fill in large gaps (e.g. between joists a couple of inches apart). I am very proud of the attached photo as “my best endeavor,” as most of the rest of the floor joists showed quite a bit of extra foam...
by WeedFarmer
9 people found this helpful
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
by HomeDepotCustomer
super sticky, and foams up more than expected. Really...
super sticky, and foams up more than expected. Really fills all those cracks and crevices. Can be razor bladed smooth and painted to match the surrounding material if you wish
by Rehabmom
Good stuff but very difficult to clean up....
Good stuff but very difficult to clean up.
by HomeDepotCustomer
Rating provided by a verified purchaser...
Rating provided by a verified purchaser
by HomeDepotCustomer
Showing 1-10 of 337 reviews