Metal Building Insulation

Metal Building Insulation

Knauf Insulation Unfaced Metal Building Insulation with ECOSE® Technology is a resilient, flexible unfaced blanket insulation made from inorganic glass mineral wool bonded by ECOSE Technology. The blanket is suitable for application of facings and has sufficient tensile and bond strength for normal handling by the fabricator and contractor. The blanket may also be used unfaced as additional insulation to fill voids in wall and roofs of metal buildings.

ECOSE® Technology

ECOSE Technology is a revolutionary binder chemistry that makes Knauf Insulation products even more sustainable. It is based on rapidly renewable bio-based materials rather than non-renewable petroleum-based chemicals traditionally used in glass mineral wool insulation products. ECOSE Technology reduces binder embodied energy and does not contain phenol, formaldehyde, acrylics or artificial colors.


When Knauf Insulation Unfaced Metal Building Insulation is faced with a suitable vapor retarder, it can be installed in exterior wall and roof surfaces of pre-engineered buildings. The product may be used unfaced to fill voids in walls and roof cavities of pre-engineered buildings.

Features and Benefits

Energy Conservation

  • Knauf Insulation Unfaced Metal Building Insulation has excellent thermal properties and reduces the building’s operating costs for heating and air conditioning.


  • Knauf Insulation Unfaced Metal Building Insulation is identified by manufacturer and R-value printed on the product.


  • Knauf Insulation Unfaced Metal Building Insulation will not rot, mold or deteriorate and will not provide sustenance for vermin, rodents or insects.

Specification Compliance

Knauf Insulation Unfaced Metal Building Insulation complies to the property requirements of the following specifications:

  • HH-I-558C Form B, Class 6
  • ASTM C 553 Type I, II
  • ASTM C 991 Type I
  • ASTM E 136
  • CGSB 51-GP-11M Type I
  • CAN/ULC S702-97 Type I

Technical Data

Surface Burning Characteristics

  • Does not exceed 25 Flame Spread, 50 Smoke Developed when tested in accordance with ASTM E 84, NFPA-255 and UL 723.

Odor (ASTM C 1304)

  • No objectionable odor emission.

Corrosiveness (ASTM C 665)

  • Does not accelerate corrosion on steel, copper or aluminum.

Corrosion (ASTM C 1617)

  • The corrosion rate in mils/yr will not exceed that of the 1 ppm chloride solution.

Resistance to Microbial Growth (ASTM C 1338)

  • Does not promote microbial growth.

Water Vapor Sorption (ASTM C 1104)

  • Less than 0.2% by volume or 5% by weight.

Noncombustibility (ASTM E 136)

  • Noncombustible.

Glass Mineral Wool and Mold

Glass mineral wool insulation will not sustain mold growth. However, mold can grow on almost any material when it becomes wet and contaminated. Carefully inspect any insulation that has been exposed to water. If it shows any sign of mold it must be discarded. If the material is wet but shows no evidence of mold, it should be dried rapidly and thoroughly. If it shows signs of facing degradation from wetting, it should be replaced. Air handling insulation used in the air stream must be discarded if exposed to water.


The chemical and physical properties of Knauf Insulation Unfaced Metal Building Insulation represent typical average values determined in accordance with accepted test methods. The data is supplied as a technical service and is subject to change without notice. References to numerical flame spread ratings are not intended to reflect hazards presented by these or any other materials under actual fire conditions.


If Knauf Insulation Unfaced Metal Building Insulation is compressed beyond a 5:1 ratio during or after lamination, the product can be damaged. Check with your Knauf Insulation sales representative to assure information is current.

GREENGUARD Certification
Knauf Insulation products with ECOSE Technology contain no phenol, formaldehyde, acrylics or artificial colors.  These products are certified by UL Environment for indoor air quality (IAQ) as low emitting products and where noted, have achieved the more stringent GREENGUARD Gold certification and verified to be formaldehyde-free. For more information, visit: