DIY

DIY Cathedral Ceiling

Northern Zone of the USA – With Reflectix® Below the Mass Insulation: R-7.0 Summer & R-1.0 Winter and a Vapor/Moisture Barrier

Southern Zone of the USA – With Reflectix® Above the Mass Insulation: R-6.0 Summer & R-2.0 Winter or a Radiant Barrier – Blocks 94% + Radiant Heat

   

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. If you need to verify your location, use our Zip Code Zone Locator included in the Installation Instructions or call (800) 879-3645.

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/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.

Benefits

  • 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

Installation Instructions

Standard Edge 72 RGB

Double Reflective Insulation
Installation Instructions: (There are 2 installation options)

Download DIY Cathedral Ceiling Installation Instructions Rev 1114

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

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

Launch Zip Code Zone Locator

  • 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

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

Launch Zip Code Zone Locator

  • 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.

RB4812550 Top of Roll 72 RGB

Radiant Barrier
Installation Instructions:

Download DIY Cathedral Ceiling Installation Instructions Rev 1114

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

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

Launch Zip Code Zone Locator

  • Benefit – Radiant Barrier – Blocks 94% + 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.

Installation Video

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

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

Important

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).

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. 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.

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®.

Photos

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

RB4812550 Top of Roll 72 RGB Standard Edge 72 RGB Hands Showing the Tab Roll on Plywood 72 RGB Easy to Install Tools 72 RGB Northern Zone Installation Southern Zone Installation