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FREE SHIPPING ON ALL CONTINENTAL US ORDERS OVER $100
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Insulating Refractory Repair for Firebrick Woodstoves and Parging - Insul Stick

$149.99
SKU HS-IS20

Insul Stick is a medium-weight refractory castable product designed for high-temperature applications. It is an insulating compound ideal for casting custom shapes for woodstoves, fireplace hearths, walls, boilers, furnaces, and more.

Key Features

  • Versatile Application: Perfect for smooth parging over firebrick in fireplace smoke chambers. It can be cast, parged, troweled, or sprayed.
  • High Insulating Value: Combines insulation and strength, meeting ASTM E-136 requirements for sealing wall penetrations for utility passthrough.
  • Packaging Options: Available in 5-lb and 20-lb pails.

Specs

Coverage: Approximately 2.5 lbs covers one sq. ft at 1/2 inch thickness. 
A full 20 lb pail covers 8 sq. ft. at 1/2" thickness. 

Mixing Instructions: Add 3/4 to 1 quart of clean water per 5 lbs of dry mix and blend thoroughly. No additional additives are required. 

Practical Examples

  • Fireplace Restoration: Use Insul Stick to parge over firebrick, enhancing both insulation and strength.
  • Boiler Maintenance: Cast custom shapes to fit around boiler components, ensuring a durable and heat-resistant barrier.
  • Utility Sealing: Seal wall penetrations for utility passthroughs with confidence, knowing Insul Stick meets strict ASTM standards.

Insul Stick is conveniently shipped in 20-lb pails, making it easy to handle and store.

Meets ASTM E-136 and ASTM C-199 standards.

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PRODUCT SPECS

Details: 

  • Made in the USA 

INSUL STICK 

SHIPPING TIME

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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INSUL STICK PRODUCT VIDEO

USING INSUL STICK

Application Guidelines:

  • Thickness: Apply Insul Stick at a thickness of 1/4 to 1/2 inch.
  • Surface Adherence: Adheres to most non-slippery surfaces, strengthening any wall.
  • Temperature Resistance: Suitable for applications exceeding 2000°F.
  • Usage: Ideal for repairs to brick, block, stone, clay flues, and other clay products. Non-water soluble when in service.

Installation:

  • Prepare the Surface: Ensure the surface is clean and non-slippery.
  • Mix the Compound: Add 3/4 to 1 quart of clean water to each 5 lbs of Insul Stick. Mix thoroughly until you achieve a consistent texture.
  • Apply the Compound: Using your preferred method (casting, troweling, parging, or spraying), apply the compound at the desired thickness.
  • Cure and Use: Allow the compound to cure as needed, then use in applications where temperatures exceed 2000°F.

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Insulating Refractory Repair for Firebrick Woodstoves and Parging - Insul Stick

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$149.99
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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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