Metacaulk Putty is a non-curing, moldable, one-component firestop material designed to seal through-penetration systems in fire-rated assemblies.

When exposed to high temperatures, the intumescent formula expands to form an insulating char that helps prevent the spread of flames, smoke, gas, and water through penetrations.

Easy to install by hand with no mixing or special tools required, Metacaulk Putty provides reliable fire protection while maintaining flexibility for future cable or conduit changes. Its non-hazardous, solvent-free formulation makes it suitable for use in occupied and confined spaces.

Key Features

• Non-curing, moldable, one-component firestop putty.

• Intumescent technology expands when exposed to fire.

• Helps block the spread of flames, smoke, gas, and water.

• Hand-applied with no mixing or special tools required.

• Strong adhesion to common building materials.

• Suitable for occupied and confined spaces.

• Contains no volatile solvents.

• Provides up to a 3-hour fire rating in approved systems.

• STC rating of 60 for excellent sound reduction (putty pads).

• Single 1/8-inch pad thickness provides 1–2 hour fire ratings in approved applications.

• No asbestos fillers.

• D.O.T. Classification: Not Regulated.

• Meets applicable building code firestop requirements.

Common Applications

• Through-penetration firestop systems.

• Electrical outlet boxes.

• Conduit penetrations.

• Electrical metallic tubing (EMT).

• Fire-rated walls and partitions.

• Commercial buildings.

• Residential construction.

• Institutional facilities.

• Healthcare facilities.

• Renovation and retrofit projects.

Ideal For

• Electrical boxes.

• Conduit penetrations.

• Cable penetrations.

• Fire-rated walls.

• Fire-rated partitions.

• Through-penetration sealing applications.

Key Benefits

Reliable Fire Protection

The intumescent formula expands during fire exposure to help maintain the integrity of fire-rated assemblies.

Simple Installation

The moldable putty installs quickly by hand without mixing, additives, or specialized equipment.

Excellent Sound Control

Putty pads offer an STC rating of 60, helping reduce sound transmission through wall penetrations.

Code-Compliant Performance

Designed to help meet firestop requirements in rated wall assemblies, including electrical box installations where required by building codes.

Safe & Non-Hazardous

Contains no volatile solvents or asbestos fillers, making it suitable for use in occupied spaces.

How to Use

Surface Preparation

• Ensure surfaces are clean, dry, and free of loose debris.

• Verify that the firestop system complies with the applicable tested assembly.

• Always follow approved installation details for the specific application.

Application Instructions

1. Remove the required amount of putty from the package.

2. Mold the putty by hand to fit the penetration or opening.

3. Apply directly around cables, conduits, electrical boxes, or other approved penetrations.

4. Press firmly to ensure complete contact with surrounding surfaces.

5. Confirm that the penetration is fully sealed according to the tested firestop system.

Important Notes

• Install only in accordance with tested and approved firestop systems.

• Follow all applicable building codes and manufacturer installation instructions.

• Designed for passive fire protection applications only.

• Always verify compatibility with the intended fire-rated assembly.

• Store in a clean, dry location until use.

Frequently Asked Questions (FAQ)

Q1. What is Metacaulk Putty used for?

Metacaulk Putty is used to seal through-penetrations in fire-rated walls and assemblies, helping prevent the spread of fire, smoke, gas, and water.

Q2. How does Metacaulk Putty work?

When exposed to high temperatures, the intumescent material expands to form an insulating char that helps maintain the fire-resistance of the assembly.

Q3. Does Metacaulk Putty require mixing or special tools?

No. It is a one-component, moldable putty that can be applied by hand without mixing or specialized equipment.

Q4. Is Metacaulk Putty safe for occupied spaces?

Yes. It contains no volatile solvents or asbestos fillers, making it suitable for use in occupied and confined spaces.

Q5. What fire rating can Metacaulk Putty provide?

When installed as part of an approved firestop system, Metacaulk Putty can provide up to a 3-hour fire rating and putty pads offer an STC rating of 60 for sound control.