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MinWool® Window Wall Insulation

MinWool® Window Wall Insulation

Johns Manville MinWool Window Wall Insulation is a lightweight, flexible, sound-absorbing, fire-resistant mineral wool batt designed primarily for use in glass and metal window wall systems. It offers superior fire resistance plus excellent thermal and acoustical insulating properties for the framed cavities found in window wall spandrels and shadow boxes.

Made from inorganic basalt fibers, the product is non-combustible, moisture-resistant, and resists the growth of mold and mildew. Its flexible batt form makes it well suited to friction-fit installation between window-wall framing members, where lower density than a full curtainwall product is acceptable.

Specification
  • Form: Flexible batt; available unfaced or foil-faced.

    Fire: ASTM E136 non-combustible; melting point >2000°F. Refer to JM data sheet for full thickness / R-value table.

Technical specification
  • Unique ref.minwool-window-wall-insulation
  • Product familyInsulation
  • Product groupMineral Wool Batt
  • TypeObject (single object)
  • Date of publishing2026-07-15
  • Edition number1
Related
  • Designed inUnited States
  • Manufactured inUnited States
Classification
  • BIMobject CategoryConstruction Materials - Insulation

Region availability

North America
Anguilla
Antigua and Barbuda
Aruba
Barbados
Belize
Bermuda
British Virgin Islands
Canada
Caribbean Netherlands
Cayman Islands
Collectivity of Saint Martin
Costa Rica
Cuba
Curaçao
Dominica
Dominican Republic
El Salvador
Greenland
Grenada
Guadeloupe
Guatemala
Haiti
Honduras
Jamaica
Martinique
Mexico
Montserrat
Nicaragua
Panama
Puerto Rico
Saint Kitts and Nevis
Saint Lucia
Saint Pierre and Miquelon
Saint Vincent and the Grenadines
Saint-Barthélemy
Sint Maarten
The Bahamas
Trinidad and Tobago
Turks and Caicos Islands
U.S. Virgin Islands
United States
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