/ Through Penetrations firestop wall / floor

Firestop Silicone | Metacaulk MC 835 | RectorSeal

Firestop Product Information:

Metacaulk® 835+ is for applications that require a silicone-based firestop. Designed for use with PVC pipe on closed (pressure) systems, EMT, insulated and uninsulated steel pipe, construction and control joints and interior expansion joints. Flexible, non-sag and low odor sealant for exterior or interior use. Used in systems where dynamic movement is expected. Sound Transmission Class (STC) rating 55, Tested in a UL 411 wall assembly/section to ASTM E90.Ready-to-use, high-performance, single component, neutral cure, silicone firestop that also acts as a barrier to water leakage and airborne sound transmission. Provides up to 4-hour fire protection. Light gray color with black flecks, no mixing required.

Firestop Additional Information:

When properly installed, product provides up to 4-hour protection against the spread of fire, smoke and noxious gas in tested and listed systems. Metacaulk 835+ meets UL Water Leakage Test, W Rating - Class 1 requirements for systems tested and listed in accordance with ANSI/UL 1479, provides acoustic benefits by minimizing noise transfer (STC-Rating of 53 when tested in a STC 54-rated wall assembly) and acts as a smoke seal for installations requiring the optional L-Rating. Meets the intent of LEED® VOC environmental regulations, meets International Building Code (IBC) and other key life safety building code requirements.

Firestop Product Document Downloads:


Firestop Key Features:

  • Firestop tested up to 4 hours in accordance with ASTM E 814 (UL 1479) &CAN/ULC S115
  • Fire Resistance tested for static construction joint systems in accordance with ASTM E 1966 (UL 2079)
  • Meets UL Water Leakage Test, W Rating - Class 1 requirements
  • FGG/BM system CPVC compatible
  • Tested in accordance with ASTM G 21 standard practice for determining resistance of synthetic polymeric materials to fungi
  • L-rated smoke seal
  • Minimizes noise transfer (STC-rating of 53 when tested in STC 54-rated wall assembly)
  • Sag-resistant, halogen-free formulation
  • Applied with conventional caulking equipment (excellent adhesion and caulk rate)
  • Excellent weatherability during construction
  • Re-enterable/repairable

Firestop Typical Applications:

Used in mechanical, electrical and plumbing applications to firestop openings created by the following penetrations in fire-rated floors, floor/ceilings or walls: metallic pipe, non-metallic pipe (FGG/BM system CPVC compatible), conduit, power and communication cable, cable trays, busways, combos, insulated pipe and HVAC duct penetrations. Metacaulk 835+ is also used to firestop blank openings and bottom-of-wall static construction joints.