3M Fire Barrier Block B258 Instruction Manual

1. Introduction

The 3M Fire Barrier Block B258 is an intumescent firestop product designed to help prevent the spread of fire and smoke through openings in fire-rated constructions. This manual provides detailed instructions for the proper handling, installation, and application of the B258 Fire Barrier Block to ensure effective fire protection in accordance with applicable building codes and safety standards.

2. Safety Information

Always prioritize safety during installation. Read and understand all instructions before use. Observe local building codes and regulations. Personal protective equipment (PPE) such as gloves and eye protection is recommended. Ensure adequate ventilation in the work area. Keep out of reach of children. In case of contact with skin or eyes, rinse thoroughly with water. Consult the product's Safety Data Sheet (SDS) for additional safety information.

3. Product Overview

The 3M Fire Barrier Block B258 is a pre-formed, intumescent block that expands when exposed to heat, creating a fire-resistant seal. It is designed for use in various firestop applications, including through-penetrations and construction joints. Its maroon color helps in easy identification. The block is typically used to seal openings around cables, pipes, and other penetrants in fire-rated walls and floors.

Image 1: The 3M Fire Barrier Block B258, a maroon-colored rectangular block used for firestopping applications.

4. Setup and Installation

4.1 Preparation

• Inspect Opening: Ensure the opening in the fire-rated assembly is clean, dry, and free of debris, dust, and loose materials.
• Measure: Accurately measure the dimensions of the opening and the penetrants to determine the required size and quantity of B258 blocks.
• Tools: Gather necessary tools, which may include a utility knife, measuring tape, and appropriate PPE.

4.2 Installation Steps

1. Cut to Size: If necessary, cut the 3M Fire Barrier Block B258 to fit snugly into the opening around the penetrants. Use a utility knife or saw for precise cuts.
2. Insert Blocks: Insert the cut blocks into the opening, ensuring a tight fit around all penetrants and the perimeter of the opening. The blocks should be installed flush with the surface of the fire-rated assembly.
3. Fill Gaps: For irregular openings or to fill small gaps, additional pieces of the B258 block can be used. Ensure no voids remain that could compromise the firestop seal.
4. Secure (if required): In some applications, the blocks may need to be secured in place using appropriate fasteners or firestop sealants as specified by local codes or engineering judgments.

5. Application Guidelines

The 3M Fire Barrier Block B258 is suitable for various firestopping applications. Always refer to specific UL, Intertek, or other third-party listings for approved applications, maximum opening sizes, and allowable penetrant types. Common applications include:

• Electrical cable penetrations through fire-rated walls and floors.
• Metallic pipe penetrations (e.g., steel, copper) through fire-rated assemblies.
• Combination penetrations involving multiple types of services.
• Construction joints where movement is expected.

Ensure the blocks are installed to the specified depth and configuration as per the firestop system design.

6. Maintenance

Once installed correctly, the 3M Fire Barrier Block B258 requires minimal maintenance. Regular visual inspections are recommended to ensure the integrity of the firestop system. Check for:

• Damage: Look for any physical damage to the blocks or surrounding fire-rated assembly.
• Gaps or Voids: Ensure there are no new gaps or voids that have formed due to building movement or alterations.
• Alterations: Verify that no new penetrations have been made without proper firestopping.

Any identified issues should be addressed promptly by repairing or replacing the affected firestop materials according to 3M guidelines and local codes.

7. Troubleshooting

Most issues related to fire barrier blocks stem from improper installation. If you encounter problems, consider the following:

• Loose Fit: If blocks are not snug, they may not provide an effective seal. Remove and re-cut for a tighter fit, or use additional material to fill voids.
• Incomplete Seal: Ensure the blocks completely surround the penetrant and fill the entire opening. Any gaps, even small ones, can compromise fire resistance.
• Incorrect Application: Verify that the B258 block is being used in an application for which it is listed and approved. Using the wrong product for a specific firestop scenario can lead to failure.
• Surface Contamination: Ensure surfaces are clean and dry before installation. Contaminants can affect adhesion or the overall integrity of the firestop system.

For complex issues or if you are unsure about proper installation, consult a qualified fire protection engineer or contact 3M technical support.

8. Specifications

9. Warranty and Support

For specific warranty information regarding the 3M Fire Barrier Block B258, please refer to the documentation provided with your purchase or visit the official 3M website. 3M stands behind its products and offers technical support for installation and application queries. For assistance, please contact 3M customer service or a local 3M representative.

Online Resources: For additional product information, technical data sheets, and safety data sheets, please visit the 3M Industrial Store on Amazon or the main 3M website.