FireRock Adhesive Fireplace Mortar - 25 Pound Bag

$65
95
Was $79.99
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Product Details

Manufacturer: FireRock
FireRock Part Numbers: MORTAR
Item Number: FRK-MORTAR
When adding a new fireplace to your outdoor living space, filling your cart with outdoor fireplace accessories is tempting. But have you covered the basics of building your new fire feature? There's no need to fret if not- FireRock makes the process easy with in-house formulas like the FireRock Adhesive Fireplace Mortar. This reliable mortar is just what you need to build your new FireRock masonry fireplace. The specially-formulated polymer creates a long-lasting bond that locks out water when properly applied, and it cures in only a day or two.

Please Note: FireRock masonry fireplaces must be installed with this mortar. FireRock masonry fireplaces installed with different brands and types of mortar will not be protected under warranty.

Customer Q&A with Product Specialists

Jessica B. from SW Colorado asked:
I'm planning to adhere 12x12 ceramic tiles to the exterior of a freezer unit that will be kept outdoors in Colorado. Would FireRock Adhesive Fireplace Mortar be suitable for bonding these tiles to the metal surface of the freezer, or to metal file cabinets that will be used as outdoor flower bed borders?
I'm planning to adhere 12x12 ceramic tiles to the exterior of a freezer unit that will be kept outdoors in Colorado. Would FireRock Adhesive Fireplace Mortar be suitable for bonding these tiles to the metal surface of the freezer, or to metal file cabinets that will be used as outdoor flower bed borders?
After reviewing the details of your project, FireRock Adhesive Fireplace Mortar is specifically formulated for bonding masonry units together, such as firebrick and stone veneer, in the construction of masonry fireplaces. Its intended application is for masonry-to-masonry construction, not for adhering ceramic tile to metal surfaces. Given that bonding tile to metal falls outside the product's designed use, and considering the additional stress from outdoor freeze-thaw cycles in Colorado, we cannot confirm its effectiveness for your project and do not recommend it for adhering tiles to your freezer or file cabinets. For this specific application, we suggest seeking an adhesive product explicitly rated for exterior tile-to-metal bonding.
Answered by: Nevins P. on Sep 01, 2026

Helpful?

0
Michael S. from Harrod Ohio asked:
Can it be used as a scratch mortar for veneer stone?
Can it be used as a scratch mortar for veneer stone?
Per FireRock, you can use the mortar for attaching stone veneer to the exterior of a fireplace.
Answered by: Kathy O.

Helpful?

0
Mike from Nashville Tennessee asked:
Can fire rock mortar be used on fire brick?
Can fire rock mortar be used on fire brick?

It could be used, yes, as this is its application with the FireRock fireplaces.

Answered by: Tyler M. - NFI Master Hearth Professional

Helpful?

0
Logan S. from asked:
Can this product be used as mortar for new firebox construction?
Can this product be used as mortar for new firebox construction?
It can be used for such a purpose, but it is intended for use only with the FireRock models.
Answered by: Tyler M. - NFI Master Hearth Professional

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Customer Reviews

FireRock Adhesive Fireplace Mortar - 25 Pound Bag
Star - 1 Star - 2 Star - 3 Star - 4 Star - 5
By Stephen L.
Oct 01, 2024

Fireplace Mortar That'll Last You Years

This FireRock Adhesive Fireplace Mortar did exactly as it stated it would when I bought it and sealed up the crack in my firebox perfectly. The crack has yet to reappear, and that was over 5 years ago. I bought this mortar again to repair another crack that appeared at the back of my firebox and I know it will work just as well as the first time I used it to seal another crack.
Star - 1 Star - 2 Star - 3 Star - 4 Star - 5
By James D.
Sep 09, 2024

FireRock Fireplace Mortar: A Dependable Repair Solution

FireRock Adhesive Fireplace Mortar has proven to be an effective and versatile repair material. Its precise instructions for curing and temperature management ensure durability while its ease of application saves time and effort.
Star - 1 Star - 2 Star - 3 Star - 4 Star - 5
By Paul L.

Reliable Mortar for Fireplace Repairs

This mortar applied smoothly and dried quickly, making it easy to patch damaged areas on my fireplace refractory panels. The instructions were clear, and I found using a torch to cure the material helpful. Just be sure to keep the flame away from the dried mortar to prevent bubbling.
Star - 1 Star - 2 Star - 3 Star - 4 Star - 5
By Nicole G.

FireRock Adhesive Fireplace Mortar: An Affordable Repair Solution

As a fireplace owner, I recently faced the challenge of repairing a damaged fake fireplace log. The mortar effectively held the log parts together, and with a touch of high-temp spray paint, I restored the log's original appearance.
Star - 1 Star - 2 Star - 3 Star - 4 Star - 5
By Joan D.

Mixed Results with FireRock Fireplace Mortar

This mortar effectively sealed small fireplace cracks but required longer curing time and had some bubbling issues.
Star - 1 Star - 2 Star - 3 Star - 4 Star - 5
By Renee G.

Rutland Fireplace Mortar: Excellent for Do-It-Yourself Firebox Repairs

I was extremely impressed with this Rutland Fireplace Mortar. It sealed gaps in my firebox perfectly, creating a fire-rated barrier as advertised. I highly recommend it for anyone looking to repair their fireplace themselves.
5.0
Star - 1 Star - 2 Star - 3 Star - 4 Star - 5
7 Reviews
Showing 6 of 7 Customer Reviews
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