Certified Faced Insulation Standard

Thermal Standard For Flexible Faced Insulation Used in Metal Buildings


A standard product specification for use by manufacturers, laminators, designers, and users of metal building insulation systems.

NIA is a nonprofit service organization dedicated to mechanical and specialty insulation contractors, distributors, and fabricators, and metal building insulation laminators.

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1.0 Scope

1.1 This specification covers the classification, composition, and the physical properties of flexible faced fiberglass insulation intended for use in the walls and roofs of manufactured metal buildings.

1.2 The thermal insulation values in this specification are for the insulation only and do not include the effects of facings, air film surface resistances, compression of insulation at the framing members of the building, through-metal conductance of fasteners, and other parallel heat transfer paths due to design or installation techniques.

2.0 Applicable Documents

2.1 North American Insulation Manufacturers Association

NAIMA 202-96® (Rev. 2000) Standard Product Specification for Fiber Glass Designed to be Laminated

2.2 American Society for Testing and Materials

  • C 167CTest Methods for Thickness and Density of Blanket or Batt Thermal Insulations
  • C 168-Terminology Relating to Thermal Insulation Materials
  • C 390-Criteria for Sampling and Acceptance of Preformed Thermal Insulation Lots
  • C 653-Guide for Determination of the Thermal Resistance of Low-Density Blanket-Type Mineral Fiber Insulation

3.0 Classification

3.1 The flexible insulation is furnished as glass processed from the molten state into fibrous form, bonded with a thermosetting resin and formed into a resilient flexible blanket or batt. A suitable vapor retarder facing is adhered to one surface.

4.0 Terminology

4.1 For definitions of terms relating to insulation, ASTM C 168 shall be considered as applying to the terms in this standard.

5.0 Ordering Information

5.1 Material shall be ordered by specifying thermal resistance (R-value), insulation length and width, type of facing, permanence of facing, facing tab width, and number of tabs.

6.0 Physical Requirements of Faced Fiberglass

6.1 The thermal resistance of the faced insulation at 75EF mean temperature (with a temperature differential of 40 to 50EF) shall be determined in accordance with ASTM C 653. Thickness recoveries shall be determined in accordance with subsection 9.1. Below is a list of the most commonly available product R-values. Manufacturers may manufacture and certify other R-values not listed below:

  • R-10
  • R-13
  • R-11
  • R-19

6.1.1 Thermal Resistance Tolerance: The resultant tested R-value shall meet the labeled R-value.

7.0 Workmanship

7.1 The material shall indicate good workmanship and shall not have visible defects which adversely affect its serviceability. Vapor retarders should not be torn or punctured. Tears and punctures shall be repaired or replaced.

8.0 Sampling and Inspection

8.1 The laminator’s normal sampling and inspection procedures shall be acceptable as outlined in Section No. 4 of ASTM C 390, unless agreed otherwise.

9.0 Test Methods

9.1 Thickness Measurement

9.1.1 Sample Preparation: A representative roll of insulation, at least 25 feet in length, is rolled on a flat surface. When roll lengths are in excess of 75 feet, it is permissible to cut the roll into two equal lengths for ease of handling. The test roll is then flipped over for its entire length. Finally, after grasping one end, the material is pulled back over itself until the original surface is again facing up and allowed to rest for 15 minutes.

9.1.2 Test Procedure: Five thickness measurements are then taken, using a pin and disc gauge per ASTM C 167 on each third of the roll starting 5 feet in from the roll ends. The five thickness checks, should be spaced uniformly over each third of the roll, sampling the full width but not closer than 1/10 of the width from edges.

9.1.3 Calculation and report: Calculate the average of 15 thickness recovery checks from the roll. The average thickness recovery value can be used to calculate the thermal resistance in 6.1 providing the thermal conductivity of the material is known or has been supplied by the manufacturer.

9.2 Length and Width Measurement

9.2.1 Sample Preparation: A representative roll of insulation is completely unrolled on a flat surface.

9.2.2 Test Procedure: A steel measuring tape of sufficient length shall be used to measure the entire length and width. An alternate method may be used where the flat surface has been previously ruled out to facilitate ease of measurement.

9.2.3 Calculation and Report: Determine the length and width in several locations and report the average values.

10.0 Inspection

10.1 Inspection of the material shall be agreed upon by the purchaser and the supplier as part of the purchase contract.

11.0 Rejection

11.1 If inspection of the sample shows failure to conform to the requirements of this specification, a second sample from the same lot shall be tested and the results of this retest averaged with the results of the original test.

11.2 Upon retest as described in 11.1, failure to conform to this specification shall constitute grounds for rejection.

11.3 In case of rejection, the laminator or seller shall have the right to inspect the rejected shipment or resubmit the lot after removal of that portion of the shipment not conforming to the specified requirements.

12.0 Product Certification

12.1 Samples of this product are tested periodically by a nationally recognized laboratory, and determined to meet the stated dimensions and thermal resistance in accordance with the NIA 404 Standard. The laminator shall represent that his/her product has been produced to the same standard as samples tested.

13.0 Requirements for Unfaced Fiberglass

13.1 Marking: Standard sizes of unfaced fiber-glass insulations are listed by their thermal resistance (R-value) as shown in subsection 6.1 with the following permanent marking identified on the insulation in a repetitive or continuous manner:

  • The Manufacturer and/or Product Name
  • The appropriate R-value

13.2 Thermal Resistance Tolerance: The unfaced fiberglass insulation shall meet the thermal resistance requirements of NAIMA 202-96 (Rev. 2000).

14.0 Packaging of Faced Fiberglass

14.1 Unless otherwise specified, the package shall be marked with the seller’s name and designation, length, width, thickness, R-value, total number of square feet, and manufacturing date code. The package shall also be marked with the label of the certifying laboratory.

14.2 Unless otherwise agreed or specified between the purchaser and the laminator or seller, the insulation shall be packed in the laminator’s standard commercial container.

15.0 Storage

15.1 The material shall be stored in such a manner as to protect the package from direct sun-light, weather, temperature extremes, and extreme compression.

15.2 Shelf life shall be agreed upon between the seller and the purchaser.

16.0 Moisture

16.1 Long service life and optimum performance characteristics of fiberglass insulations are predicated on the requirements that dry insulation be applied to clean and dry surfaces, and that they be protected against incursion of water during installation, and protected against incursion of water by adequate design and maintenance after installation.

16.2 Wet insulations have poorer thermal performances than dry insulations. In service, it is difficult to dry web insulations completely. The incursion of water may also introduce compounds and organisms which may accelerate corrosion of metals and may permit mold or mildew growth and odors.

16.3 Tests conducted under laboratory conditions on relatively small specimens of fiberglass artificially wetted with distilled water in the liquid phase and thoroughly dried under conditions free of shear or compressive forces indicate no adverse effect on the apparent thermal conductivity. This would suggest that insulation wetted in service could regain most of its thermal resistance provided it could be dried without a significant loss of thickness. However, there is no assurance that the drying method used or the forces acting on the wet insulation will not result in loss of thickness or that contaminants in the water may not contribute to corrosion, mold or mildew growth, or odors.

17.0 Lamination Process Control

17.1 NAIMA Insulation Facts #28 provides recommendations for laminators to help metal building insulation meet stated R-values after lamination.

Disclaimer: The National Insulation Association (NIA), its members, and/or its agents, make no guarantee as to, and assume no responsibility for, the correctness, sufficiency, or completeness of the information contained herein. Further, they do not endorse any products, sources, systems, or procedures which may be referenced or identified in these materials.