Dupont Tuff-R (ci) Insulation Board

Dupont Tuff-R (ci) Insulation Board

DuPont Tuff-R (ci) Insulation Board is a high-performance polyiso foam with dual reflective foil facers. Tuff-R (ci) is a non-structural, rigid board insulation consisting of a glass-fiber-infused, closed-cell polyisocyanurate foam core laminated between 1.0 mil smooth reflective aluminum facers on both sides. As a result, Tuff-R (ci) offers high, long term R-value providing continuous, durable insulation within the building envelope.


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Product Description

Tuff-R™ (ci) is specially designed to have a Class A fire rating and can be used in a range of concealed and exposed applications including use in exterior walls. It has the required flame-spread index of 25 or less and a smoke-developed index of 450 or less and has NFPA 285 tested assemblies that are approved for use per Section 2603.5 of the International Building Code in Exterior Walls of Types I, II, III, IV construction.

Ease of Installation
Tuff-R™ (ci) Insulation Boards are:

  • Lightweight – easy to handle and install with a utility knife or any sharp blade
  • Quick to install – installs quickly to walls including girts, steel stud, tilt-up, block and wood
  • Effective – high R-value(1) provides enhanced thermal efficiency; facers help reduce air penetration and water vapor intrusion allowing products to be detailed as a weather-resistive barrier
  • Durable – Class A fire rating allows them to be used in a range of concealed and exposed applications with enhanced job-site durability; less damage and job-site waste

Available Sizes
Tuff-R (ci) is available in 4’x 8’ dimensions up to a maximum thickness of 3.2”. Full sizing information can be found in Table 1 of the TDS located in the tab below.

Physical Properties
Property and Test Method                                                                   Value
Compressive Strength, ASTM D1621, psi, min.                                    20
Flexural Strength, ASTM C203, psi, min.                                               40
Water Absorption, ASTM C209, % by volume, max.                             0.1
Water Vapor Permeance, ASTM E96, perm., max.                            <0.04
Maximum Use Temperature, °F                                                             250
Surface Burning Characteristics(3), ASTM E84 for
both foam core and finished product                                        
Flame Spread                                                                                         <25
Smoke Developed                                                                                <450

Sustainable Solutions

  • Tuff-R (ci) can be used for continuous insulation to assist in meeting and exceeding both the most current IECC and ASHRAE 90.1 energy standards.
  • Tuff-R (ci) is manufactured with a zero ozone depleting potential.
  • The use of Tuff-R (ci) helps reduce the carbon footprint of commercial buildings by reducing the energy consumed to maintain comfort.

Applicable Standards
Tuff-R (ci) 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

Tuff-R (ci) complies with the following code and tests verified by third party entities:

  • 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 E283 (Modified Based on AC12 Section Standard Test Method for Determining Rate of Air Leakage through Exterior Windows, Curtain Walls, and Doors under specified Pressure differences across the specimen. Results were <0.02 L/s/m2
  • ASTM E2357 Standard Test Method for Determining Air Leakage of Air Barrier Assemblies – no leakage when used with Liquidarmor™ – CM Flashing and Sealant or Weathermate™ Straight Flashing
  • ASTM E331 Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference – no leakage when used with Liquidarmor – CM Flashing and Sealant or Weathermate™ Straight Flashing
  • 2009 International Building Code (IBC) Section 2603
  • ICC-ESR – 3766
  • UL 1256 – Fire Test of Roof Deck Constructions, Roof Deck Construction No. 120 and No.123
  • The following designs are 1, 2, 3 or 4 hour wall rated assemblies as listed in the UL Fire Resistance Directory: U424, U425, U460, U902, U904, U905, U906, U907, V482, V499
  • Fire Performance Evaluation of an Exterior Masonry Wall System Incorporating Tuff-R (ci) Insulation Board Tested in Accordance With NFPA 285, 2006 Edition

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 Tuff-R (ci) Technical Data Sheet