Johns Manville (JM), a global manufacturer of energy-efficient building products and engineered specialty materials and a Berkshire Hathaway company, announced the release of the first-ever fiberglass duct wrap with an installed thermal resistivity rating of R-12: Microlite® FSK. This Formaldehyde-free™ duct wrap is designed specifically to meet new code requirements set forth by the IECC in 2015 that mandate the use of R-12 insulation on ducts in unconditioned spaces in climate zones 5-8.

The new 4.4-inch wrap is the newest addition to the JM R-12 insulation portfolio.

“We understand that installers and specifiers need multiple insulation solutions for the varied applications they encounter on a jobsite,” said Brennan Hall, JM’s HVAC Product Manager. “This is why we are offering two new R-12 solutions: Microlite, a Formaldehyde-free™ FSK-faced fiberglass duct wrap, and Linacoustic® RC, a fiberglass duct liner with an antimicrobial coating. Now, contractors can achieve R-12 thermal performance in a single layer of insulation, and they have the variety of insulation solutions they need to meet the unique requirements of varied applications. These two new R-12 products offer the same high-quality performance our customers have come to expect from Johns Manville’s duct wrap and duct liner.”

Johns Manville’s R-12 Microlite duct wrap comes with an FSK facing designed to help ensure a closed system that prevents moisture drive and offers condensation control. This design helps prevent damage to the insulation and surrounding areas. Additionally, the material is GREENGUARD® Gold certified.

R-12 Microlite and R-12 Linacoustic RC round out the JM R-12 duct insulation portfolio with two, high-quality insulation materials that are the only duct liner and duct wrap on the market to offer a single-layer R-12 thermal performance.

The full R-12 insulation portfolio from Johns Manville includes:

  • Microlite® FSK fiberglass duct wrap
  • Linacoustic® RC fiberglass duct liner
  • Linacoustic® R-300 fiberglass board
  • 800 Series Spin-Glas® fiberglass board
  • XSPECT® ISOfoam APF Board (polyiso foam)