Rutland Castable Refractory Fireplace Cement - 12.5 Pound Tub

For mortar joints and worn areas around 1/2 inch deep, the castable refractory cement on this page is the right choice. Rutland's directions for cartridge-style fireplace mortar suggest layering for joints deeper than 1/8 inch and recommend castable products for deeper repairs. Since your depths are 1/2 inch, this is beyond the single-pass capability of a cartridge mortar. The Rutland Castable Refractory Fireplace Cement - 12.5 Pound Tub is designed to fill large holes and worn areas in masonry fireboxes, replace missing mortar, and tuckpoint brick. It can also be cast into custom shapes where a brick has eroded away. This product is rated to 2200 degrees F, cures without heat in approximately 24 hours, and can be painted once dry. The application thickness ranges from a 1/4 inch minimum to a 1.5 inch maximum per pass, with layering allowed for deeper repairs, so your 1/2 inch depths are well within its range. To mix, combine one quart of cool, clean water per 12.5 pounds of dry mix. Only mix what you can use within 20 to 30 minutes, as it sets up quickly. A 12.5-pound tub will cast an area approximately 12 inches x 12 inches x 1.25 inches, providing a reference for coverage. If you have a larger floor or need to rebuild several bricks, consider the Castable Refractory Cement for Fireplaces by Rutland (25 Pound Tub), which is the same material in a larger quantity. For any remaining joints that are shallow (under 1/8 inch), the Rutland Fireplace Mortar - 10.3 Ounce Cartridge is suitable. It loads into a standard caulk gun and is specifically for repointing firebox joints. It's rated to 2000 degrees F and is available in black, gray, and buff. However, if color matching is critical, using the castable refractory cement for the entire repair might be preferable. If you only have a few deep joints, you could apply multiple layers of the cartridge mortar, approximately 1/8 inch each, allowing 24 hours to dry between layers, instead of using the castable refractory cement. Before applying either product, ensure the area is prepared by chiseling or raking back loose and crumbling mortar to sound material. Use a vacuum and brush to remove all dust and debris. Keep the repair from drying out during the first 24 hours while the castable sets. Both products contain cement, so wear safety goggles, rubber gloves, and a NIOSH-approved dust respirator during mixing and application.

It is recommended to use the Stovo product to seal the gap where the gas line was and to repair any minor cracks in the panel measuring less than 1/8" in width. Any cracks wider than 1/8" would require a replacement of the refractory panel.

This product is designed for brick to brick repairs and adhesion, or casting bricks.

No, this is not intended for use with wood.