Go
Do-It-Yourself (DIY)
Cathedral Ceiling

R-6 with a Vapor/Moisture Barrier - With Reflectix® Below the Mass Insulation
Radiant Barrier - With Reflectix® Above the Mass Insulation

In a Cathedral Ceiling, several installation options are available for enhancing the energy efficiency of this type of structure. Ease of installation and handling are additional benefits that make adding Reflectix® to your project attractive. There are two methods for installing Reflectix® products in a Cathedral Ceiling. Depending on the region of the USA your home is located; please refer to the “Zip Code Zone Locator” on this page.







Recommended Products:

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/Scrim/Reflective - Roll
• RB48125 (48” x 125’)

Benefits:
• Blocks 96% of radiant heat
• 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

Testing and Certification:
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. For a copy of an actual test report, please e-mail us at customerservice@reflectixinc.com or call at 800-879-3645.

Air Space Requirements:

Zip Code Zone Locator

For the Regional Recommendation for the Cathedral Ceiling application, please verify the location of your home with the “Zip Code Zone Locator” function below.




Reflective Insulation
Installation Instructions: (There are 2 options)

Download DIY Cathedral Ceiling Installation Instructions.pdf

1. Directly to Roof Deck - Above Fiberglass - Southern Zone of the USA Only (Refer to "Zip Code Zone Locator" Above)

• Benefit - Radiant Barrier
• 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 (Refer to "Zip Code Zone Locator" Above)
• Benefit - R-6 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.

Reflective/Scrim Radiant Barrier
Installation Instructions:

Download DIY Cathedral Ceiling Installation Instructions.pdf

Directly to Roof Decking - Above Fiberglass - Southern Zone of the USA Only (Refer to "Zip Code Zone Locator" Above)

• Benefit - Radiant Barrier
• 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.

Ventilation:
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®.

Important:

Additional Resources:

There are a wide variety of terms and words associated with the Reflectix® family of products. Those in common usage are itemized below in two categories - Products & Applications.

Products: Reflective Insulation, Radiant Barrier, Cathedral Ceiling Insulation, Crawl Space Insulation, Concrete Slab Insulation, Duct Insulation Indoors, Duct Insulation Outdoors, Duct Insulation Spacers, Expansion Joint, Knee Wall Insulation, Pipe Wrap Insulation, Radiant Floor Insulation, Return Air Duct Panning, Wall Insulation, Water Heater Insulation, Metal Building Insulation, Post and Frame Building Insulation, Foil Tape, Metalized Tape, White Poly Tape, Sill Sealer, Foil Insulation, Foil Radiant Barrier, Bubble Pack Insulation, Bubble Insulation, HVAC Insulation, Easy to Install Insulation, No Itch Insulation, Energy Saving Products, Energy Efficient Products. Also, Products/Terms within our industry include: Low-e Coatings, Radiant Barrier Paint, Radiation Control Coatings, Radiant Barrier Plywood, Radiant Barrier Decking, Radiant Barrier Chips, Radiant Barrier Tax Credit.

Applications: Attic, Behind Hot Water Radiator, Cathedral Ceiling, Concrete Slab, Crawl Space, Duct Indoors, Duct Outdoors, Expansion Joint, Garage Door, House Wrap, Knee Wall, Pipe Wrap, Radiant Floor, Snow Melt, Sill Sealer, Storage Buildings, Exterior Wall, Masonry Wall, Water Heater, Wine Room, Work Shop, Agricultural Building, Commercial Building, Return Air Panning, Metal Building Roof, Metal Building Wall, Post and Frame Building Roof, Post and Frame Building Wall.

All About Reflectix® | About Reflective Technology | Applications | Products | Literature | Contact Us
Reflectix, Inc. #1 School Street, P.O. Box 108, Markleville, IN 46056
Phone: (765) 533-4332 | (800) 879-3645 | Fax: (765) 533-2327 | Email: customerservice@reflectixinc.com

All Photos, Renderings, Illustrations and Literature are the Property of Reflectix, Inc.