Fireplace Mortar | Castable Fire Brick Refractory Cement - 12-1/2lbs

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Our Castable Fire Brick is ideal for repairing larger areas of damaged masonry. The 12.5 pound bucket of refractory fire brick cement is just the right size to mold up to a 12 x 12 x 1.5 inch square. Our high temperature cement mix holds its shapes during the setting process so you can work vertically on overhead brickwork, horizontally at the base, or even cast into any shape. Try using this indoor-outdoor rate material to create solid floors for fire pits or ovens! This dry-mix formula reaches a full cure in 24 hours - no heat required - and will then withstand temperatures up to 2200°F. The non-water soluble refractory cement is tan-gray in color to blend in with fireplace masonry, and can be painted over if desired.

Not for direct food contact
Indoor and outdoor use

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  • Preparation:

    • ​​Make sure working area is clean and free of all dirt, rust, and debris.

    • Wear rubber gloves and safety goggles.

    • Protect the surrounding area with a drop cloth or tarp to prevent stains on carpet or flooring.

  • To use:

    • Mix dry contents with clean, cool water according to product directions in a plastic bucket.

    • Only prepare an amount that can be used within 20-30 minutes, as this mixture will set up quickly.

    • Follow directions on the product per the casting that you are attempting.

Size: 12.5 Pound Bucket
Color: Tan-Gray
Water-to-Cement Ratio: 1 Quart : 12.5 lbs.
Temperature Rating: 2200°F (1204°C)

Estimated Lead Time:

Please allow 1 week for shipping unless otherwise specified. 

Can I use this instead of firebrick to build the bed of a firebox in an indoor fireplace? I plan on using this over the existing rough stone and cement base to form a solid surface.

Asked by Kiril | 10-15-2017, 11:08 PM | 1 answer(s)

I am planning to build the throat (vertical part)of a 'j' shaped burn chamber for a rocket mass heater using this material. 12"" H x 12" W x 6" wall thickness w 6" throat. It will be cylindrical in shape with a hollow core of 6inches. How much will i need to do this project?

Asked by Sylvia Bodiford | 10-12-2017, 09:38 PM | 1 answer(s)

I need this for the inside of a coal furnace would this be appropriate?

Asked by Tessa | 07-24-2017, 05:37 PM | 1 answer(s)

I have an older home with a wood burning fireplace where there existing fire brick is starting to deteriorate, can I use this product to skim coat the existing firebox.

Asked by BRAD  | 07-17-2017, 03:25 PM | 1 answer(s)

I would like to use the cement to make decorative fire bricks with a mold for use in my fire pit. Would this product be suitable and what type of mold would you suggest? I was thinking of using latex or silicone molds. Thank you.

Asked by Sewwhat84 | 04-28-2017, 09:13 AM | 1 answer(s)

How many fire brick can I lay with one bucket of this product, 1/8 mortar joints, 700 fire brick masonry heater. Thanks

Asked by Michael | 03-29-2017, 06:13 AM | 1 answer(s)

Can I use this on the inside of my fire pit that is made of store bought retaining wall stone as a layer of protection? And if so can it be as thin as a half inch?

Asked by Evl65 | 03-25-2017, 10:14 AM | 1 answer(s)

Can this product be used to seal copper line penetrations on on exterior wall that is a fire stop wall? Thank you!

Asked by ahillkrc | 03-24-2017, 09:04 AM | 1 answer(s)

Will this product work to repair a pizza oven cooking stone. the stone is approx. 2" thick and has an approx. 1/4" to 1/2" crack running thru it. Can we use this as a patch?

Asked by Dave | 03-21-2017, 01:52 PM | 1 answer(s)

Hi, is this food grade chamotte or cement? I am building a bread and italian pizza oven, can you help, please. Thanks.

Asked by Graov7 | 02-25-2017, 09:25 AM | 1 answer(s)

Can I pour this as concrete for a base for a Outdoor Forge? I pour concrete and I know regular concrete will crack and pop and bust over time from heat. Thanks for the reply.

Asked by LaFatFury09 | 02-05-2017, 03:04 AM | 1 answer(s)

Hi, can i make a brick oven with this material? Thank you.

Asked by walabaddane | 01-15-2017, 10:53 AM | 1 answer(s)

I have a wood stove insert that appears to have a cement bottom inside. It has deteriorated and was wondering if this could be used to replace the areas that have broken as well as the areas that are pitted. Thanks.

Asked by TwoEagle | 01-03-2017, 04:37 PM | 1 answer(s)

Can this be used to make a panel insert?

Asked by Mark | 12-26-2016, 02:10 AM | 1 answer(s)

What is the total volume this can cover? The description says a 12 square foot area, but at what height? 12'x12'x1"? I would like to know this to estimate the number of 9"x4.5"x2.5" bricks I could make. Thank you.

Asked by Dan | 12-24-2016, 01:54 AM | 1 answer(s)

I'm looking to make fire bricks with this cement to line my firebox on my smoker. Will this work for my project?

Asked by C. Valenz | 12-08-2016, 01:53 AM | 1 answer(s)

I have a broken rear refractory panel in my wood burning fireplace insert in my living room. It measures 17.5" tall x 20.5" wide x 1" thick. If I make a mold, will this product work as a replacement refractory panel? If so, will one 12lb bucket pour a 1" thick 20.5" x 17.5" panel? If not, how many buckets will I need?

Asked by Bagotus98 | 12-06-2016, 07:02 AM | 1 answer(s)

I am building a coffee can forge for making small knives and other small items. I was wondering if this product would work as an inside lining?

Asked by James | 11-28-2016, 06:44 PM | 1 answer(s)

Can this be used to repair refractory wood burning fireplace panels. Very large 4 to 6 inch area deteriorated to internal steel mesh. Panels are very light cement color also. Please advise.

Asked by rventola | 10-24-2016, 11:35 AM | 1 answer(s)
Need some firebrick and was going to buy the standard size and cut it, but then I found this castable firebrick that I made a mold for the correct size. a little extra work but well worth it. thanks.
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Last updated on June 8th 2022.
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