3M B258 Fire Barrier Block B25...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$133.06
$83.06
3M B258 Fire Barrier Block B258

3M B258 Fire Barrier Block B258

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Model: B258
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$133.06
$83.06
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3M Fire Barrier Block B258

  • Recommended Applications

    • Blank openings
    • Cable trays
    • Insulated pipes, combination penetrations
    • Cables
    • Metal pipes

  • Overview

    • When sealing larger cavities, use 3M™ Fire Barrier Block B258 to restore the integrity of the wall with a simple "stack, seal, and done" application, without the use of special tools. The blocks are engineered to remain securely in place, eliminating traditional wire mesh reinforcements. Pre-formed blocks help technicians fill large openings quickly . The material is easy to trim on site without special tools, achieving a tight, custom fit. No cure time is required, which means installation is completed faster, and the blocks are paintable with primer for a more seamless appearance.
    • Fits medium to large openings in wall and floor through-penetrations
    • Installation requires no special tools
    • Block is paintable with primer
    • Can be sealed with 3M™ Fire Barrier Rated Foam FIP 1-Step and other 3M™ fire barrier sealants (sold separately)
    • The blocks are fully re-enterable and reusable, saving time and money, while minimizing waste. Once the opening is filled, seal around the perimeter and any penetrating items with 3M™ Fire Barrier Rated Foam FIP 1-Step or other 3M™ fire barrier sealants (sold separately).
    • Can be repaired and reused as needed, saving time and labor
    • Pre-formed foam block maintains tight firestop seal to prevent fire, smoke and toxic gas transmission
    • 3M™ B258 Fire Barrier Blocks are firestop tested to the criteria of ASTM E 814/UL 1479 Standard Test Method for Fire Tests of Penetration Firestop Systems, ASTM E 84/UL 273 Standard Test Method for Surface Burning Characteristics of Building Materials, ASTM E 90 Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements, and ASTM E 413 Classification for Rating Sound Insulation.
    • No cure time means faster completion
    • Our 3M™ Fire Barrier Block B258 is a pre-formed foam block designed for easy installation to effectively seal larger openings against smoke, toxic gas and flame. It is simple to use and helps reduce sound transmission.
    • Effective and easy to install, 3M™ Fire Barrier Block B258 are part of our family of fire protection products that offer the broadest, long-lasting solutions for a variety of commercial, industrial and residential applications. As a trusted leader in the fire protection industry, 3M offers a broad line of affordable products designed to meet the most demanding firestop requirements. Find the solution you need from the industry-preferred line of fire protection products.
    • Firestop tested in accordance with ASTM E 814/UL 1479


B258 - spec sheet

Manufacturer Resources

Product Specs

3M B258 – Frequently Asked Questions

How fast can I get the 3M B258 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the 3M B258 come with a warranty?
Absolutely. The 3M B258 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the 3M B258?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the 3M B258 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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