Microlite L

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Designed for lamination to a wide range of custom vapor-retarding facings, Johns Manville Microlite® L blanket insulation features a smooth, uniform laminating surface.

Johns Manville Microlite® L Formaldehyde-free™ blanket insulation offers an R-Value of up to R-30 and comes in unfaced rolls designed for lamination to a wide range of vapor-retarding facings. Microlite L insulation provides excellent thermal and acoustical performance and can be used in new construction and retrofit applications in pre-engineered metal buildings.


Formaldehyde-free: Will not off-gas formaldehyde in the indoor environment.
Thermally Efficient: Provides effective resistance to heat transfer with R-values up to R-30.
Sound Control: Reduces transmission of sound through roofs and walls of metal buildings.
Fire Resistant: Flame Spread of 25 or less and Smoke Developed of 50 or less.
Durable Inorganic Glass: Will not rot, mildew or deteriorate and is noncorrosive to pipes, wiring and metal studs.
Superior Performance: Bonded glass fibers are dimensionally stable and will not slump within the wall cavity, settle or break down during normal applications.

  Flame Spread    ASTM E84   ≤ 25
  Smoke Developed   ASTM E84   ≤ 50
  Noncombustible   ASTM E136   Pass
  Sound Absorption   C423   Pass

Data Sheet

Microlite L Data Sheet


Microlite L SDS
Microlite L SDS (ES)


Metal Building Insulation Sell Sheet

Available Documents