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Providing dust-free, itch-free installation, plastic-wrapped Johns Manville ComfortTherm® batts and rolls make projects easier to complete.

Johns Manville ComfortTherm® poly-encapsulated thermal and acoustical insulation offers R-Values up to R-30 and is available in precut batts to fit standard wall cavities or rolls for custom installation in any size of wall cavity. ComfortTherm® insulation is wrapped in plastic for dust-free, itch-free installation, and can be used in a wide variety of wood frame, engineered wood and steel frame construction applications, including new construction and retrofit.

CT_R13_15B_E002_PROD 190x122

Note: Color of product may differ based on the manufacturing location.


Thermally Efficient: Effective resistance to heat transfer, with R-values up to R-30.
Formaldehyde-free: Will not off-gas formaldehyde in the indoor environment.
Sound Control: Reduces sound transmission through exterior and interior walls, floor and ceiling assemblies.
Fire-Resistant: Can be left exposed where building codes permit. Flame Spread of 25 or less and and Smoke Developed of 50 or less.
Resilient Inorganic Glass: No rotting, mildew or deterioration. Also noncorrosive to pipes, wiring and metal studs.
Superior Performance: Stable bonded glass fibers will not slump within the wall cavity, settle or break down during normal applications.

  ASTM Standards   ASTM C665   Type II, Class A, Category 1 or 2
  [Standard ComfortTherm is Category 1 (vapor retarder).
  ComfortTherm for hot, humid climates is Category 2
  (non-vapor retarder).]
  Flame Spread   ASTM E84   ≤ 25
  Smoke Development   ASTM E84   ≤ 50
  Water Vapor
  ASTM E96   0.5 Perms (29 ng/Pa-s-m2)
  Water Vapor Sorption   ASTM C1104   5% or less by weight
  Odor Emission   ASTM C1304   Pass
  Corrosiveness   ASTM 665   Pass
  Fungi Resistance   ASTM C1388   Pass

Data Sheet

ComfortTherm Data Sheet


ComfortTherm SDS
ComfortTherm SDS (ES)

Certifications and Specifications

Fiberglass Batts EDP

Installation Instructions

Fiberglass Installation Instructions
Fiberglass Installation Instructions (ES)


Product Selector Guide


Limited Warranty


Installing Wall Insulation Video


Installating in Your Attic Video


Insulating Around Objects Video


Insulating Your Crawl Space Video

JM Overview Video


Insulating Floors or Ceilings Video

JM Fiberglass Video

Available Documents