Tenon Refractory Mortar - High-Temp Mortar for Fireplaces & Chimneys, 10 lb, Up to 2550°F

High-Temperature Performance for Harsh Masonry Environments

Tenon Refractory Mortar is engineered for demanding, heat-exposed masonry setups. This preblended mix is designed to handle the inside of fire pits, fireplaces, and chimneys where durable joints and reliable sealing are important. By combining a ready-to-use formula with robust heat resistance, it aims to support you through common high-heat tasks without needing complicated preparation.

Whether you’re updating an old hearth or building a new one, this mortar focuses on practical performance and ease of use. Expect a strong, dependable result in spaces that experience direct flame, radiant heat, and rapid temperature changes. The product’s formulation seeks to stay intact under repeated heat cycling, which may help joints and interfaces maintain their integrity over time.

Key Benefits

• READY TO USE: Preblended and simply needs water to activate, saving setup time.
• INDOOR OR OUTDOOR: Suitable for fireplaces, fire pits, pizza ovens, and chimney work such as lining, parging, or repairs.
• EFFICIENT WORKING TIME: Provides about 1 hour of usable work time before hardening begins.
• HIGH STRENGTH: Upon curing, the mortar becomes water insoluble and resistant to acids, supporting durable joints.
• ASTM CERTIFIED: Meets ASTM C199 requirements, aligning with common building code expectations for fire-related masonry.

Typical Uses

• Setting clay flue liners inside chimneys for secure, heat-tolerant installations.
• Parging smoke chimney chambers to improve containment and finish.
• Repairing and reinforcing joints in firebrick assemblies, fireplaces, and fire pits.
• Indoor and outdoor applications where high-temperature exposure is a consideration.

How to Use

• Mix with clean water to a workable consistency, then apply within the product’s working time.
• Trowel into joints or surfaces, shaping as needed for a secure seal and uniform finish.
• Allow to cure according to surrounding conditions and manufacturer guidelines; ensure proper ventilation during curing.

Tenon’s Refractory Mortar aims to offer practical, high-temperature masonry support without promising specific performance results in every situation. For code compliance and project success, check local building requirements and follow best-practice masonry methods.