Metacaulk Box Guard

DESCRIPTION: Precured dry intumescent one-component fire-rated pad for use in electrical boxes to maintain the integrity of fire-rated wall assemblies.


  • 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; adheres to back of electrical box
  • Economical, labor-saving (compared to putty pads); great for retrofit jobs
  • Reduces sound transmission

PERFORMANCE: UL Classified system; tested in accordance with ASTM E90 (UL 411), and ASTM E119 (UL 263); tested by a third party independent laboratory to the ASTM G21 standard with Fungal Growth Rating results of zero; VOC compliant (CDPH Standard Method v1.2); STC Rating 53

Product Variations

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



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