Metacaulk Box Guard Firestop
Manufacturer RectorSeal Fire Stopping Products
Metacaulk Box Guard Firestop

Metacaulk® Box Guard™ is a one-component fire-rated pad for use in electrical boxes. It is inserted on the inside back wall of an electrical box and is a highly intumescent firestop material. Saves labor costs. Box Guard™ is an economical alternative to putty pads. Great for use on retrofit jobs. 

Complies to Required Environmental Testing of Accelerated Aging and High Humidity as per UL 1479 Fire Test of Through-Penetration Firestops. US Patent Number 6,207,085.


Metacaulk® Box Guard™ Features

  • Easy to Install
  • Cost Effective
  • Highly Intumescent; expands when exposed to heat
  • Adheres to the back of electrical boxes
  • Non-Conductive
  • Sound Transmission Class (STC) 53*

*Tested in a UL 411 wall assembly/section to ASTM E90.


Product Information

Product Code Size Quantity Per Case
Single Box
Double Box
4-11/16" x 4-11/16"

Additional Product Literature
Data Sheet
Safety Data Sheet