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16 oz. Fireblock Insulating Foam Sealant

  • Save money and time by using this fire code approved formula
  • Air-sealing and insulating saves up to 20% on home energy costs
  • 16 oz. Fireblock Insulating Foam Sealant
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Product Overview

GREAT STUFF Fireblock Insulating Foam Sealant 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.

Specifications

Dimensions

Product Height (in.)9.5Product Width (in.)3

Details

Insulation FeaturesFire Block Rated,Paintable,StainableInsulation R-ValueR2
Insulation TypeSpray CanNumber of Pieces1
Product Weight (oz.)16 ozReturnable90-Day

Warranty / Certifications

Warranty InformationNA

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
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  • What are the dimensions of the product?

Customer Reviews

  • 2.4
    out of 9 reviews
  • 38%recommend this product
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Showing 1-9 of 9 reviews
When opening the nozzle from red to green, it just loosely dangles, it's not firmly open... The p...
When opening the nozzle from red to green, it just loosely dangles, it's not firmly open... The product dispenses in a pathetic stream, with a significant delay. it sticks to the nozzle and smears around, barely sticking to anything else. Be prepared to spread it as desired using a putty knife or some similar applicator. I needed something for "firestopping" (what a waste of time! I guess the code writers need work too) and this was almost useless, you're better off buying something in a tub and applying. How could 1 star signify "poor"? There should be negative stars, in which case, on a scale of -10 to 10 (a REAL scale) I give this product a -8
by
Response from DowGreatStuffDec 3, 2018
Hi SimonPheonix, this is an atypical result from this product. We apologize for any inconvenience you may have encountered. GREAT STUFF™ Fireblock cannot be used for firestop applications. Cured foam is combustible and may present a fire hazard if exposed to flame or temperatures above 240°F (116°C). GREAT STUFF™ Fireblock Insulating Foam Sealant does not prevent or stop fires. It is designed to seal penetrations through and between floors and electrical runs in wall studs, minimizing air flow and impeding the spread of fire and smoke. GREAT STUFF™ Fireblock complies with the International Building Code, which defines “fireblocking” as the use of approved building materials installed in concealed spaces to resist the migration of fire and hot gases, and requires that such materials be tested according to ASTM E84, ASTM E814 (modified), and UL 1715. Please call the Technical Service Cetner at 1-800-441-4369. for additional assistance.
    this product is great
    Genaral question about all the Great Stuff Products can any of the products can be used around the ducking for exaust leading ouside from an eletric dryer? reason i ask is becouse i have a coold draft coming in. Thanks
    by
      • Recommended
      Question for Dow
      Can this foam be used to fill the gaps around a hot radiator pipe? Hot steam goes through it. Thanks.
      by
      Response from CIGNov 1, 2013
      GREAT STUFF (TM) Insulating Foam Sealant products should not be used around heaters, furnaces, fireplaces, or recessed lighting fixtures where it contacts heat conducting surfaces. Cured foam is combustible and may present a fire hazard if exposed to flame or temperatures above 240F. This product is flammable during dispensing. Do not smoke or use near open flame. Shut off pilot lights and sources of ignition until tack free.
        • Recommended
        "One time use" not mentioned on packaging
        I had a very small job (blocking cracks and holes to deter mice) and bought a 12 oz can. It worked pretty much as-advertised ... EXCEPT: There is no way to clean the nozzle, and according to DOW on this website, DOW does not offer replacements for the "straw applicator". I'm sorry, but that's just plain deceptive. The can and packaging should have a PROMINENT "One Time Use" label. I have more cracks to fill -- I'll be looking for something else.
        by
        Response from CIGOct 17, 2013
        GREAT STUFF (TM) polyurethane foam sealant products are one-component foams and do not lend themselves to re-use. Once a can has been used and allowed to sit, it will seal itself shut. One time use should be expected, which is stated on back of can. Here is a tip on how to prolong the use of a can: before starting your project, have a long nail or pipe cleaner with some WD40 handy. Once you are done using the product, saturate the long nail or pipe cleaner with the WD40 and slide that into the straw applicator. Leave the straw attached to the can and store it upright. That can may then restart for you for up to 30 days.
          Messy & wasteful
          I used Pestblock to stop honeybees from getting between the siding and wall of house. The screw-on applicator quickly became clogged and the sticky foam came out in gobs that would not stay in place. Luckily I think there is enough in the one spot where the bees were entering that it might accomplish the job, but I am greatly unhappy with the product. The applicator straw, after having to use a coat hanger wire to clear the clogs, broke and the canister is more than 1/2 full of liquid, so you probably should make it in smaller containers and state on the label it is a one-use item. What a messy, wasteful product!!!!!!
          by
          Response from The GREAT STUFF TeamSep 3, 2013
          GREAT STUFF (TM) polyurethane foam sealant products are one-component foams and do not lend themselves to re-use. Once a can has been used and allowed to sit, it will seal itself shut. One time use should be expected, which is stated on back of can. Here is a tip on how to prolong the use of a can: before starting your project, have a long nail or pipe cleaner with some WD40 handy. Once you are done using the product, saturate the long nail or pipe cleaner with the WD40 and slide that into the straw applicator. Leave the straw attached to the can and store it upright. That can may then restart for you for up to 30 days.
            Ignites at 240F ... Totally misleading
            Not sure why they call it fireblock when it is highly flammable--both solid and in the can. Yes, it keeps air from feeding a fire but under flame it ignites immediately. Don't expect Dow or 3M to change the name... It's an industry standard nomenclature.
            by
            Response from CIGJun 3, 2013
            GREAT STUFF™ FireBlock Insulating Foam Sealant is a minimal-expanding, single-component foam sealant for general purpose building envelope air sealing. This product is defined by the International Building Codes as the use of approved building materials installed in concealed spaces to resist the migration of fire and hot gases. GREAT STUFF™ FireBlock is tinted orange to be more recognizable to building code officials. This product is not approved for use in firestop systems. The Dow Chemical Company makes the GREAT STUFF™ products, if you are looking for other material other than GREAT STUFF™, please refer to 3M’s website.
              Good Luck Getting it from the can!
              I am an avid user of the standard "Great Stuff" products from the large gaps, door and window Jambs, and the standard foam. I have had great success with all that I have used to this point trying to insulate around my home. Recently, I have taken on the task of re-wiring and re-insulating my attic. The process in inherently arduous and frustrating due to the nature of the project alone. I bought all new IC rated fixtures to be installed from the attic side of the drywall. The intention was to install the fixtures and foam seal around them with the Fireblock foam. I bought 8 cans. Out of the 8 cans, I was only able to successfully use 2. Right off 2 cans the straw nozzle broke when screwing them to the can. The other 4 cans the nozzle on the can broke off when trying to get the foam to dispense... This leaves 4 "useable cans" with 6 nozzles right? Wrong, 2 more nozzles broke off of 2 more of the cans when I was able to get good nozzles onto them. First I had to drive all across town visiting 4 department stores, and 2 home centers to find enough of the fireblock to complete my job, but then ended up with only 2 useable cans... Major disappointment.
              by
              Response from CIGAug 9, 2012
              GREAT STUFF™ Fireblock Insulating Foam Sealant is considered a fire block not a fire stop. It Impedes spread of fire and smoke through service penetrations. Cured foam is combustible and will burn if exposed to temperatures above 240°F (116°C). Do not apply GREAT STUFF™ foam around heaters, high heat lamps or recessed lighting fixtures, radiators, furnaces or in places where it could contact heat conducting surfaces. Each can is marked with an expiration date, beyond which the contents may have cured and be unable to spray. Forcing the nozzle may break it open and allow the contents to escape. If the can has been used before, the foam will cure in the nozzle and straw and seal shut within two hours. One-time use of the can should be expected. We are sorry that you had a unfortunate experience with our product. GREAT STUFF™ products are sold at the below retailers, most of which will replace defective product as long as it is not expired. THE HOME DEPOT LOWE'S WALMART MENARDS ACE HARDWARE 84 LUMBER ACO HARDWARE ALLIED BUILDING PRODUCTS ANDERSONS BI-MART BLAINS FARM & FLEET CRAFTY BEAVER HOME CENTERS DIXIELINE LUMBER DUCKWALL-ALCO MANION'S WHOLESALE BUILDING SUPPLIES, INC. MCCOY MCLENDON HARDWARE MEIJER MILLS FLEET FARM MILLS SUPPLY SUTHERLANDS/CIMARRON LUMBER & SUPPLY TRUE VALUE VALU HOMECENTERS
                Works good for its designed usage
                The product information can be misleading if you are unfamiliar with the Building and Fire Code requirements for this type of material. This product is for RESIDENTIAL COMBUSTIBLE FIREBLOCK usage only. DO NOT use for penetrations of Commercial Fire Stop Systems where the Fire Barrier/Wall must be maintained to its designed rating. Polyurethane foam products ARE combustible even after "drying" into a solid foam and therefore can not be used as part of a required Commercial Fire Stop System. The appropriate Fire Seal or Fire Caulk should be used. Make absolutely sure you are using this product appropriately, DO NOT ASSUME.
                by
                Response from CIGAug 1, 2012
                We are sorry to hear that our products did not work properly. It sounds like you may have purchased defective or expired product. Expiration date information can be found on the bottom of the can. As with all items sold through retailers, defective product should be returned to the place of purchase for exchange or refund. These stores do receive credit from Dow for returning defective products. Sorry for the miscommunication this GREAT STUFF(TM) FireBlock is recognized as an Alternate Fireblocking material for residential construction only
                  fireblock
                  I picked this product because this one I used the most this year,I have used all of them in my 128 year old home and I am please with all of your product.
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                    Showing 1-9 of 9 reviews