Metacaulk Cover Guard

DESCRIPTION: Precured dry intumescent one-component fire-rated gasket for use with electrical boxes when addressing steel electrical box penetrations in fire-rated assemblies (the “24 inch rule”).


  • Intumescent expands at the exposure of heat, forming a refractory char that tightly seals preventing the spread of flame, smoke and toxic fumes
  • Easy to install; applied by hand; mounted on inside of cover plate & installed simultaneously
  • Covers opening; does not take up volume in electrical box
  • Economical, labor-saving (compared to putty pads); great for retrofit jobs
  • Reduces sound transmission

PERFORMANCE: Tested in accordance with ASTM E119 (UL 263), ASTM E814 (UL 1479) and ASTM E90; VOC compliant (CDPH Standard Method v1.2); complies to Required Environmental Exposure Testing of Accelerated Aging and High Humidity as per UL 1479 Fire Test of Through-Penetration Firestops; STC Rating 54


Revit Details

Product Variations

  • 66265 - Metacaulk Cover Guard Single Decor
  • 66266 - Metacaulk Cover Guard Double Decor
  • 66270 - Metacaulk Cover Guard Double Gang Receptacle
  • 66272 - Metacaulk Cover Guard Single Gang Receptacle
  • 66274 - Metacaulk Cover Guard Double Gang Switch
  • 66276 - Metacaulk Cover Guard Single Gang Switch



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