DuPont Thermax Heavy Duty Insulation

DuPont Thermax Heavy Duty Insulation

DuPont Thermax Heavy Duty Insulation is designed as an insulation and interior finish system for walls and ceilings in metal, wood post frame, and concrete or masonry buildings, as governed by building codes.


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Product Description

Thermax Heavy Duty consists of a glass-fiber-reinforced polyisocyanurate foam core faced with nominal 4 mil embossed white thermoset-coated aluminum on one side and 1.25 mil embossed aluminum on the other. The tough 4 mil white embossed aluminum surface makes it a durable insulation/finish choice for use in moderate-impact areas, and it can be pressure-washed up to 2,000 psi with a 15-degree or greater spray tip (at 3’ minimum distance). Thermax Heavy Duty meets the USDA requirements for “Incidental Food Contact Materials” when used as surfaces not in direct contact with food, such as floors, walls, ceilings, etc.).

Thermax Heavy Duty also offers high, long-term thermal resistance, with facers that help prevent water and water vapor intrusion into the insulation foam allowing it to stabilize at a higher R-value. Used in conjunction with the appropriate joint closure system for the application, Thermax Heavy Duty – with its low perm rating – can help to reduce moisture condensation within and behind the insulation.

Ease of Installation
Thermax™ Heavy Duty:

  • Installs quickly to walls and ceilings – inside and outside
    of purlins, trusses or bar joints
  • Can be installed exposed to the interior without a
    thermal barrier
  • Helps reduce the potential for condensation within the
    wall assembly
  • Is lightweight – easy to cut, handle and install

Sustainable Solutions
Thermax Heavy Duty is manufactured with a zero ozone depleting potential blowing agent. The use of Thermax brand insulation helps reduce the carbon footprint of commercial buildings. Thermax is compliant with California Department of Public Health (CDPH) VOC emissions requirements.

Available Sizes
Sizes, R-values and edge treatment options for Thermax Heavy Duty can be found in Table 1 of the TDS. Contact your local sales representative for additional sizes.

Physical Properties
Property and Test Method                                                                   Value
Compressive Strength(2) , ASTM D1621, psi                                       25.0
Flexural Strength, ASTM C203, psi                                                     40 min.
Dimensional Stability, ASTM D2126                                                 0.2% max
Water Absorption, ASTM C209, % by volume, max.                             0.1
Water Vapor Permeance, ASTM E96, perms                                       <0.01
Maximum Use Temperature, °F                                                             250
Light Reflectance, Visual Light Spectrophotometer, %                         65
Surface Burning Characteristics(3), ASTM E84 for
both foam core and finished product                                                Class A
Flame Spread                                                                                          25
Smoke Developed                                                                                <450

Applicable Standards
Thermax Heavy Duty meets ASTM C1289 – Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board, Type I, Class 2. Applicable standards include:

  • C203 – Standard Test Methods for Breaking Load and Flexural Properties of Block-Type Thermal Insulation
  • C209 – Standard Test Methods for Cellulosic Fiber Insulating Board
  • C518 – Standard Test Method for Steady- State Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus
  • D1621 – Standard Test Method for Compressive Properties of Rigid Cellular Plastics
  • D2126 – Standard Test Method for Response of Rigid Cellular Plastics to Thermal and Humid Aging
  • E96 – Standard Test Method for Water Vapor Transmission of Materials
  • D1623 – Standard Test Method for Tensile and Tensile Adhesion Properties of Rigid Cellular Plastics

Thermax Heavy Duty complies with the following codes:

  • ASTM E2178 Standard Test Method for Air Permeance of Building Materials – leakage rates less than 0.001 L/s/m2 at a test pressure of 75 Pa.
  • ASTM E2357 Standard Test Method for Determining Air Leakage of Air Barrier Assemblies
  • 2021, 2018, 2015, 2012, and 2009 International Residential Code (IRC) Section 316
  • 2021, 2018, 2015, 2012, and 2009 International Building Code (IBC) Section 2603
  • 2019 California Green Building Standards Code
  • 2020 ICC 700 National Green Building Standard
  • FM 4880 – Wall-Ceiling Construction Metal-Faced – Class 1 Fire Rated to Max. 30’ Exposure High, 3.0” Thick, 4’ Wide, When Installed as Described in the Current Edition of FMRC Approval Guide. Contact Dupont Technical Support for most current FM 4880 attachment requirements.
  • Thermax products are covered under Underwriters Laboratories Inc. (UL) file R5622
  • UL 1256 – Fire Test of Roof Deck Constructions, Roof Deck Construction No. 120 and No. 123
  • Class A UL 723 (ASTM E84) Surface Burning Characteristics of Building Materials
  • The following designs are 1, 2, 3 or 4 hour wall rated assemblies as listed in the UL Fire Resistance Directory:
    U026, U326, U330, U354, U355, U424, U425, U460, U902,
    U904, U905, U906, U907, V454, V482, V499
  • Intertek CCRR-0435
  • Miami-Dade County approved

Contact your DuPont sales representative or local authorities for state and local building code requirements and related acceptances.

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General Insulation Company Inc. is an insulation supplier / insulation distributor that stocks and fabricates a wide variety of industrial and commercial air barrier, vapor barrier, moisture and water barrier products for the construction market.

Thermax Heavy Duty Insulation Technical Data Sheet