Cathedral Ceiling

Double Reflective Insulation

Reflective/Bubble/Bubble/Reflective – Roll

• BP24025 (24” x 25’)
• BP48025 (48” x 25’)

Staple Tab, Reflective/Bubble/Bubble/Reflective – Roll

• ST16025 (16” x 25’)
• ST24025 (24” x 25’)

Radiant Barrier

Radiant Barrier, Reflective/Woven Fabric/Reflective – Roll (Heavy Duty)

• RB4812550 (48” x 125’)

Note: Click here for information on our larger rolls which are available by Special Order at the Contractor or Customer Service Desks.

• Easy to install
• Does not require any protective garments or respirators
• Convenient roll sizes
• Does not promote growth of mold or mildew
• Not affected by moisture or humidity

Double Reflective Insulation Installation Instructions:

(There are 2 installation options)

Installation Instruction pdf: DIY Cathedral Ceiling Revised 012021

1. Directly to Roof Deck – Above Fiberglass – Southern Zone of the USA Only

Verify the location of your home with the “Zip Code Zone Locator” function below.

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• Benefit – R-6.0 Summer & R-2.0 Winter
• It is easiest to install either 16” or 24” wide product (depending on rafter spacing).
• Begin at the top of the cavity. Run product flush to the decking, parallel to the rafter.
• Staple sheet directly to the deck (nails poking through the Reflectix® product from above will not interfere with performance).
• Do not block any venting (cut around).
• No need to cover rafters (no loop around).
• Ensure that a continuous air space (0.75 inch minimum) is on the bottom side of the Reflectix® product (required and for ventilation).
• Install venting and mass insulation per local codes and manufacturer’s installation instructions.

2. Attached to the Lower Edge of the Rafter – Below the Mass Insulation (Fiberglass) – Northern Zone of the USA Only

Verify the location of your home with the “Zip Code Zone Locator” function below.

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• Benefit – R-7.0 Summer & R-1.0 Winter and a Vapor/Moisture Barrier
• Either the 16” or 24” wide product (depending on rafter spacing) is recommended.
• The Staple Tab product is the easiest to work with for this application (but the Standard Edge product is equally effective).
• Install venting (required in Cathedral Ceilings) and mass insulation per local codes and manufacturer’s installation instructions.
• A minimum of a 0.75” air space is required on the underside (towards the interior of the home) of the Reflectix® product. This air space can be created in one of two installation methods:

1. Tuck the product up into the cavity and staple to the side of the rafter every 2 to 3 inches fully enclosing the rafter cavity.

2. Staple the product directly to the underside of the rafter every 2 to 3 inches fully enclosing the rafter cavity. Nail 1” x 2” (nominal) furring strips to the underside of the rafter (creating a continuous 0.75” cavity).

• Install interior panel per local codes and manufacturer’s installation instructions.

Radiant Barrier Installation Instructions:

Installation Instruction pdf: DIY Cathedral Ceiling Revised 012021

Directly to Roof Decking – Above Fiberglass – Southern Zone of the USA Only

Verify the location of your home with the “Zip Code Zone Locator” function below.

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• Benefit – Radiant Barrier – Blocks 96% of radiant heat
• Cut the entire roll of product into 16” or 24” lengths with a miter saw (depending on rafter spacing).
• Begin at the top of the cavity. Run product flush to the decking, parallel to the rafter.
• Staple sheet directly to the deck (nails poking through the Reflectix® product from above will not interfere with performance).
• Do not block any venting (cut around).
• No need to cover rafters (no loop around).
• Ensure that a continuous air space (0.75 inch minimum) is on the bottom side of the Reflectix® product (required and for ventilation).
• Install venting and mass insulation per local codes and manufacturer’s installation instructions.

Northern Zone of the USA – With Reflectix® Below the Mass Insulation

Southern Zone of the USA – With Reflectix® Above the Mass Insulation

Review These Important Safety Guidelines Prior to Installation:

• ALWAYS check local building codes before installing Reflectix®.
• ALWAYS check the area you are insulating and make any needed repairs. Any worn wiring should be replaced before you begin installing Reflectix®.
• ALWAYS make sure work areas are well ventilated and well lighted.
• ALWAYS use eye protection when operating a staple gun.
• ALWAYS use caution and common sense when using a staple gun. Be aware of electrical wiring locations. Stapling into a wire can cause severe shock or death. NEVER staple into electrical wiring.
• ALWAYS be careful when working with large pieces of Reflectix® on windy days.
• When installing Reflectix® on bright sunny days, it is best to wear sun glasses.
• Do not work in areas such as attics when temperatures are too hot.
• Please Note: The intention of these Installation Instructions and 3-D renderings are for the sole purpose of illustrating the correct location and relative position of the Reflectix® products in specific building assemblies. The correct construction methods and techniques are the responsibility of the installer or contractor. The methods outlined are recommendations on location of the Reflectix® products as a guideline. There are no claims on the part of Reflectix, Inc. that these building assemblies are finite standards or meet building code requirements (as they can vary by region).

N39 – Reflectix Fact Sheet per FTC Rev 0118

Reflectix® products are thoroughly tested at either nationally approved, independent laboratories or leading universities. Tests are performed to current American Society of Testing and Materials (ASTM) standards when a standard exists. To obtain a copy of our Product Testing Specifications, please refer to the “Additional Resources” tab. The documents are also available by e-mail at customerservice@reflectixinc.com or call (800) 879-3645.

Good ventilation in your attic increases your comfort and helps the materials of your house last longer. Be sure not to block ventilation paths when you install Reflectix®.

DIY Air Space Requirements Rev 0219

Reflectix Literature / Product Testing Specifications

F1 – Solutions for the Homeowner Revised 102022

F2 – Solutions for the Pro Revised 012024

Pictured: 1. Heavy Duty Radiant Barrier, 2. Double Reflective Insulation, 3. Double Reflective Insulation with Staple Tab, 4. Tools for Installation, 5. Northern Zone Application, 6. Southern Zone Application