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FREE SHIPPING ON ALL CONTINENTAL US ORDERS OVER $100
FREE SHIPPING ON ALL CONTINENTAL US ORDERS OVER $100

Firebrick Mortar Refractory - 50lb bag

$149.98
SKU HS-50B-3
Size

Firebrick Mortar from Heat Stop is the ideal mortar mix for high temps and is engineered for use in laying fire brick. Popular applications include clay flue linings, fireboxes, furnaces, masonry ovens, kills, boilers, and both interior and exterior chimneys, among other applications.

This 50-pound pail of dry compound is mixed with water to create 60 lbs of mortar that will lay up to 100x 2-1/2" thick bricks with joints of 1/16 to 1/8" thick and can accommodate joints up to 1/2" thick.

This refractory mortar meets ASTC C-199, ASTM C-1283, & ASTM E-136 standards and the NFPA-211 residential building code.

Handles extremely high temps, more than 2,000 degrees F.

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50 lb Bags sold individually

PRODUCT SPECS

Details: 

  • Made in the USA 

HEAT STOP REFRACTORY MORTAR

Rubber Playground Border Landscape Timber

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Call (800) 567-5358 for pricing and logistics questions 

Note by default all Heat Stop orders ship from our centrally located Ohio warehouse where a full stock of Refractory Mortar and Castable products are maintained.

Most orders ship out 1-2 business days following the order depending on stock levels. Delivery times shown on the shipping map are typical, though not guaranteed.  

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HEAT STOP INSTALL VIDEO

PRODUCT OVERVIEW 

Where Is Refractory Mortar Used?

The simple answer would be chimneys and fireplaces. Using common sense, it's used anywhere that is exposed to very high temperatures. There have been failures in parts of the chimney and fireplace firebox because someone did not use the right kind of mortar for the application. 

The National Fire Protection Association or NFPA is a self-funded nonprofit organization that was established in 1896. They recommend the use of tested, medium-duty refractory cement in the construction of fireplace fireboxes, in coating smoke chambers, and in the setting of clay flue liners. They also recommend cement and its agents be non-water-soluble and this is where calcium aluminate comes into play. The calcium aluminate binder will be set hydraulically which will meet the requirements. Without calcium aluminate, or something similar, someone will build a chimney, and even after it cures, it's exposed to moisture, so the joints will soften and wash out.

Heat Stop 50 Refractory Mortar

If you have a well-designed masonry fireplace or a bake oven, you will add value to your home along with charm and needed warmth in the winter months. Studies have shown that masonry fireplaces are no the top of the list among home buyers. If you are considering adding a fireplace to your home, you need to ensure it's designed and installed properly. The concrete masonry industry has offered an easy-to-follow guide to help you out.

These instructions have been contributed by engineers, manufacturers, contractors, building code officials, and technical agencies. If you follow their instructions and advice, you can have a safe, quality outcome that is compliant with local and national building codes. Always check with your local code enforcement before starting construction.

Frequently Asked Questions

Once Heat Stop has been installed, how long do I need to wait before applying heat? 

It's best to wait one day after the masonry is installed in a chimney or fireplace for a firebrick or clay flue lining before applying heat.

Can Heat Stop be mixed with standard concrete and still provide refractory properties?

Heat Stop is not meant to be mixed with any other products. The application would lose any refractory capabilites if Heat Stop is mixed with other non-refractory products.

What is the best Heat Stop solution for joints in clay flue lining and firebrick?

The Heat Stop ii and Heat Stop 50 products are the best refractory mortar products for installing clay flue lining and firebrick because they are completely non-water soluble in service after the initial set. They have an indefinite shelf life, and excellent drying characteristics no matter the humidity. These products are specified by NFPA-211 (National Fire Protection Association), in addition to meeting all local, regional and national building codes.

What ASTM specs and building codes are in place for fireplace and chimney construction?

Building codes require refractory products that meet ASTM C-199 (medium duty) for fireplace and chimney construction. All Heat Stop products (including the castable products Insul Stick, Insul Cast and Heat Cast 40) meet or exceed this ASTM C-199 (medium duty) requirement. Firebrick must meet the ASTM C-27 requirement, and clay flue lining must meet the ASTM C-315 and ASTM C-1283 requirements. ASTM C-105 is a discontinued specification for fireclay and should NOT be used in fireplace and chimney construction. Fireclay mixes with regular mortar do not meet current building codes.

What is the ideal thickness for joints when using Heat Stop refractory mortar?

It is recommended to apply between 1/16" and 1/8" thick joint for all of the Heat Stop refractory products. Should a thicker joint be required then its best to use the Heat Stop ii or Heat Stop 50 dry mix rather than the wet premix product. It taxes approximately 50 lbs. of product to lay 100 firebrick.

Which applications are commonly used for this refractory cement?

Heat Stop is used for a variety of projects. Here's a list of some of our clients common applications:

  • Fireplace chimneys
  • Indoor and outdoor fireplaces & firepits 
  • Firebrick and clay flues
  • Forges
  • Crematorium Furnaces

It is recommended to apply between 1/16" and 1/8" thick joint for all of the Heat Stop refractory products. Should a thicker joint be required then its best to use the Heat Stop ii or Heat Stop 50 dry mix rather than the wet premix product. It taxes approximately 50 lbs. of product to lay 100 firebrick.

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Refractory Cement is a heat-resistant material designed to line fireboxes and withstand very hot environments (2,000-3,000*F) such as firebox linings, forges, kilns, ovens, incinerators, crematoriums, and other high temperature equipment. Refractory cement is commonly combined with other products like firebrick

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