RUTLAND Fireplace Mortar is perfect for repairing small chips or cracked firebrick, re-pointing mortar joints between firebricks, and bonding firebricks together. Adheres masonry to masonry for brick, firebrick, and stone. Easy to apply with a caulking gun and will last for years. It sets as hard and as strong as firebrick after curing and can withstand the high temperatures produced by a wood fire.

Patch firebricks or repair masonry - versatile mortar is the perfect fit for a wide range of projects
Requires heat to cure; may be painted once cured
For indoor use only
Rated to 2000°F (1090°C)
Available in 3 colors: Gray (Rutland item# 63G), Black (Rutland item# 63) and Buff (Rutland item# 63B)
For large repairs, use Rutland Fireplace Patch (item# 62) or Castable Refractory Cement (item# 600)
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California residents

Additional Resources

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Questions & Answers

Q:will this product work to provide a smoke barrier between the framing of an inserts side windows and the insert?s metal cabinet?

by|Nov 24, 2022

1 Answer

Answer This Question

A: No, this product is designed to be used on masonry surfaces only. You should try using our High Heat RTV Silicone Sealants to seal this area.

by|Nov 28, 2022

Q:Want to seal between brick and metal and then paint. Will this product work for that purpose?

by|Nov 23, 2022

1 Answer

Answer This Question

A: If you can perform the heat-cure necessary, then e recommend using Furnace Cement to make the repair. Once heat-cured, it can be painted.

by|Nov 28, 2022

Q:Do you have to seal this with a paint after filling cracks with this in a brick gas fireplace? Or would the painting be just cosmetic? And if you do paint what paint do you recommend?

by|Nov 21, 2022

1 Answer

Answer This Question

A: Hi, thanks for your interest in Rutland 10.3 fl. oz. Fireplace Mortar Black Cartridge. Painting the surface would just be cosmetic, it is not required. I would recommed our 1200°F Hi-Temp Brush-On Paint. If you need further support, you can call us at 1-800-544-1307 Mon-Fri. You can also email us at sales@rutland.com. Feel free to visit our website at https://www.rutland.com for additional information on Rutland products, including training videos, safety information, and more! Rutland Customer Support Team

by|Nov 22, 2022

Q:Can this be used to seal a crack in the ceramic back panel of a insert fireplace? What is the temperature rating of this mortar?

by|Nov 18, 2022

1 Answer

Answer This Question

A: Hi Josh, thanks for your interest in Rutland Fireplace Mortar. Yes, Rutland Fireplace Mortar can be used to seal a crack in the ceramic back panel of an insert fireplace. The temperature rating is 2000°F. If you need further support, you can call us at 1-800-544-1307 Mon-Fri. You can also email us at sales@rutland.com. Feel free to visit our website at https://www.rutland.com for additional information on Rutland products, including training videos, safety information, and more! Rutland Customer Support Team

by|Nov 20, 2022

Customer Reviews

4.6 out of 5

(208)

4.6
out of 208 reviews
100%recommend this product

149

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Showing 1-10 of 208 reviews

Nov 26, 2020

As advertised... use as directed and you'll get the results. Was perfect for my job.

Verified Purchase

Recommended

Jan 25, 2023

Verified Purchase

Jan 4, 2023

It quickly sealed a leak on a stove pipe. Great product...

It quickly sealed a leak on a stove pipe. Great product

Verified Purchase

Dec 28, 2022

Verified Purchase

Dec 21, 2022

This is good stuff. I used it to fix...

This is good stuff. I used it to fix some small cracks in the fireplace. The only thing did not like is the package said it should dry 24 hours before curing. 36 hours before curing would have been better. It worked well and cured but there was one spot where it bubbled up.

Verified Purchase

Dec 15, 2022

Verified Purchase

Dec 8, 2022

piece or crap

This product is crap, i followed all the directions still it got cracking and bubbling. Does not work, dont waste your time or money on this.

Recommended

Dec 8, 2022

Rutland Fireplace Mortar worked exactly as advertised. I had significant...

Rutland Fireplace Mortar worked exactly as advertised. I had significant gaps between my firebox and the brick facade. After first filling these gaps with expanding foam firestop, I applied the fireplace mortar to provide a permanent fire-rated seal. This was one DIY home improvement project that worked out exactly as planned.

Verified Purchase

Dec 7, 2022

Worked

It worked to repair crack in fire box.

Verified Purchase

Recommended

Nov 28, 2022

Verified Purchase

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$548

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Internet #202218154

Model #63G

Store SKU #513805