Product Summary

Rockfon® Plenum Barrier Board is a pliable stone wool that is able to conform into narrow spaces and around structure and mechanical obstacles such as electrical or plumbing elements. Plenum Barrier Board improves sound isolation and stops noise and speech from traveling between rooms. These boards are most commonly used in private offices, meeting rooms, patient or exam rooms , classrooms or new construction.

Merrimack Building Supply is proud to be New England’s leading Rockfon® Plenum Barrier Board distributor. With facilities in New Hampshire, Boston, Massachusetts and Connecticut we are able to deliver high quality Rockfon® products to your doorstep with our extensive fleet of boom trucks, box trucks and flat beds.

Features and Benefits

  • Improves sound isolation and privacy between rooms
  • Installs quickly above interior partitions
  • Lightweight and easy to cut
  • Conforms around pipes and ducts
  • Expands and contracts with deflection

Fire Performance

Fire Performance ? Surface burning characteristics:
UL723 (ASTM E84) Flame Spread Index: Less than 25
Smoke Developed Index (UL Labeled): Less than 50

CAN/ULC S102 Flame Spread Index: Less than 25
Smoke Developed Index: Less than 50

ASTM E1264 Classification


  • Combine with CAC 20-40 ceilings
  • Private offices & meeting rooms
  • Patient, exam & treatment rooms
  • Classrooms
  • Premanufactured/modular rooms
  • New construction or post occupancy remediation


Stone wool (mineral wool) semi-rigid insulation board with reinforced aluminum foil facing adhered on one side

Hygienic Properties


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