Hunter XCI Classs A Panels

What is Hunter XCI Class A?

Hunter Panles XCI Class A is a market leading fire rated rigid polyiso panel. Designed specifically for use in fire rated applications.

  • Polyiso offers increased R-Value per inch vs. mineral fiber, XPS or EPS options
  • Designed for use in continuous insulation to assist in meeting the most current ASHRAE 90.1, IECC, IBC and IRC standards
  • Can be installed directly on steel studs in a variety of wall assemblies without the need for gypsum sheathing
  • Flame spread of 25 per ASTM E 84
  • Provides R-Values from 6.3 to 22.0 in a single layer
  • Superior fire performance, durability and dimensional stability
  • Exterior facer is treated with non-reflective coating

Where can Hunter XCI Class A Panels be fitted?

  • External walls

  • Internal walls

  • Crawlspaces

  • Attic spaces

  • Between rafters

  • Above rafters

  • Internal Basement walls

  • Sub floors

  • Ceilings

  • First floors

The above applications are just some but not all the applications in which Hunter XCI Class A  panels can be used in. This is a very versatile rigid foam insulation panel that is easy to handle, cut and transport.

How can Hunter XCI Class A panels be cut?

Hunter XCI panels can be cut using a utility knife or even a fine tooth hand saw. It is always recommended to wear a dust mask while cutting Polyiso insulation as it gives off dust particles that can irritate after prolonged exposure. This dust is not believed to be harmful, however it can be annoying if you breath it in so it is best to wear a dust mask.

What is Hunter XCI Class A  panels made from?

Xci Class A  is a fire rated wall insulation panel composed of rigid polyisocyanurate foam core manufactured on-line to reinforced foil facers on both sides. The non reflective coatings differentiates this product from its XCI foil faceing brother. 

Xci Class A is an exterior wall insulation panel composed of a Class A rigid polyisocyanurate foam core manufactured on-line to embossed foil facers on both sides. It is designed for use in commercial wall applications to provide continuous insulation within the building envelope.


  • Polyiso offers highest R-value per inch of any foam plastic board insulation
  • Designed for use in continuous insulation to assist in meeting the most current ASHRAE 90.1, IECC, IBC and IRC standards
  • Can be installed directly on steel studs in a variety of wall assemblies without the need for gypsum sheathing
  • Flame spread of 25 per ASTM E 8
  • Provides R-Values from 6.5 to 23.0 in a single layer
  • Superior fire performance, durability and dimensional stability
  • Exterior facer treated with non-reflective coating

NFPA Compliance with CMU, Concrete, Steel Stud and Fire Retardant Treated Wall types. See Build A Wall sheets to the right for individual assembly component choices.

Hunter XCI Class A Panels - Get the right information to buy the right insulation products

Proper insulation is essential for all the houses. To achieve a high-energy efficiency level in a building, you have to insulate all the parts of a house, from the foundation to the roof. You may have applied the appropriate air sealing and high insulation to the attic. However, still, you maybe still feeling cold and your home drafty during the cool winter season. Similarly, you can feel warm during the summer season. To solve this issue, insulation is vital for the outer walls.

You must insulate the outer walls of your house. Not only should you insulate the sub floor but also the external walls. The professionals have found that the best insulation for the exterior wall are the blown-in style insulation and continuous external wall insulation by Hunter Panels. The rigid polyiso panels are ideal for a continuous seal around a building, helping to provide a full building envelope insulation system. However, blanket insulation like glasswool or mineral wool may not offer the thermal efficiency and air sealing for the same thickness of insulation. Thus the need to go with a more thermal efficient panel like Hunter XCI Class A. 

Concrete masonry wall - Insulate with Hunter Class A Panels 

Typically, concrete masonry walls are of various types, and you have to apply different insulating techniques for each wall type. For a cavity masonry wall system, you may choose to insulate the cavities or use interior insulation applications or go with a complete external building envelope insulation system. Every design of the masonry wall has various positive and negative aspects in terms of insulation techniques. While choosing the insulation, you must focus on the climate within your state or region, thermal properties of the insulation and also insulation design. 

The position of the insulation in the wall may affect the dew point sites, and the potential of condensation. Hunter XCI Class A Panels can be used for insulating masonry walls of your house. These panels work with finishes, like cultured stone, artificial stone and many different facades that are available today. Hunter XCI Class A panels are designed to comply with Standard ICC-ES AC51. With this product you should only use non-combustible claddings. As this product is fire rated to a Class A standard it would not be a good idea to put a continuous combustible material over the insulation as this could cause a fire to propagate and by-pass your fire rated panel.

Safety standards of the panels

You may know that blowing agents such as HFCs, CFCs and HCFCs may be used for manufacture of some insulation boards, these gases increase the depletion of ozone. However, Hunter Panels has not used any of these elements for its products. Thus, without causing any effect on the environment, which make this product excellent for the environment and for domestic and commercial use. Hunter Panel insulation over its life time will save more carbon gases than what was used to create it in the first place.

Dimensional stability of the panel

Hunter XCI panels are a unique and reliable product due to the dimensional stability. These panels maintain their dimensions and shape for the lifetime of the product. Normal temperature variations will not affect the panels. These insulation panels due to their Class A rating can endure very high level of temperatures without any defect. Your panels will dimensionally remain stable and will continue to perform as normal.

R-Values of the Hunter XCI Class A Panels 

R-value or the thermal resistance indicates the resistance capacity of the insulating panel to the flow of conductive heat. While the R-value is higher, the effectiveness of insulation will also have an increase. This R-value may vary due to the insulation type, density and thickness. However, temperature, moisture buildup and aging also cause a variation to this R-value. While there is more than one layer on most polyiso insulation boards, you have to take into account the foil layers and add them together to find the total R-value.

The thickness of the insulation dictates the resulting R-value of the insulation properties of the Hunter XCI Class A panels. We have made a list of the product thickness and the related R-values below for your reference.

  • 25 mm- 6.0
  • 51 mm- 12.1
  • 38 mm- 9.0
  • 64 mm- 15.3
  • 89 mm- 21.7
  • 102 mm- 25.0

Precautions in dealing with the panels

Its important to note to protect the insulation core from the risk of an open flame. The manufacturer of the insulation board has nothing to do with the poor-quality on-site workmanship nor improper storage or hazards conditions that may present itself on a construction site. 

NFPA 285 passed product

NFPA 285 is one of the fire tests, intended to determine the flame spread potential to different stories of a house through a wall.  Hunter XCI Class A Panels are also a reliable product for this application as it has passed NFPA 285 test. Fire spread risk is greatly reduced when applied in accordance with manufacturers specifications and instructions.

Facings for the insulation

Facings are one of the features of polyiso panels. You can find these facings, glued to your insulation material during the manufacturing process. The facing can also help in protecting the surface of insulation. Some facings work as a radiant, vapor and air barrier. They are also able to resist flames for periods of time. In case of the Hunter XCI Class A Panels, there is an embossed foil facing, acting as a radiant barrier.

Materials, used in the Hunter XCI Class A Panels

Polyiso or polyisocyanurate is a thermosetting-style closed-cell, comprising of low thermal conductivity, HCFC-free gas inside the cells.

In due course, polyiso insulation’s R-value can start to get reduced due to the escape of low-conductivity gas and an access of air. We call this process as the thermal drift. The foil facings on your polyiso insulation help in the stabilization of R-value. A similar effect would also occur in mineral wool and glasswool as the insulation would tend to slump slightly as gravity takes its tool.

The professionals have found that the rigid foam’s R-value remain consistent many years, due to the high-quality foil facings acting as a radiant barrier.

We have presented you with various details on Hunter XCI Class A Panels. We suggest you read the above information before you buy the product for your own purpose and familiarize yourself with its properties and advantages.

To buy any type of insulation material, you can visit the website We offer nationwide delivery for all our orders placed online.

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