Double Bubble

Duct Insulation R-5.6


Note: Installation instructions and illustrated drawings are recommendations only, while proper local construction methods are the responsibility of the installer.

Reflectix® Duct Insulation is an alternative to other types of fibrous insulation products. Ease of handling and quick installation make Reflectix® the first choice when selecting insulation for round or rectangular ductwork in HVAC systems. The product provides an R-5.6 when installed with a 0.375” air gap between the duct and the insulation.

Product Description

Reflectix® Duct Insulation consists of two layers of highly reflective film (96% reflectivity) that are bonded to two tough layers of polyethylene. Two inner layers of insulating bubbles resist conductive heat flow while a center layer of polyethylene gives Reflectix® high reliability and strength. The product has a tape running the length of the roll for easy identification by code officials. The tape identifies the manufacturer and ASTM Testing: Reflectix® Duct Insulation • ASTM E84 • Class A / Class 1 • ASTM C411 Passed


  • Wrap rectangular or round ductwork in HVAC applications
  • Heating costs can be greatly reduced
  • Eliminate unnecessary heat loss / gain and air leakage
  • Helps to ensure consistent temperatures
  • Non-toxic / non-carcinogenic
  • Fiber-free
  • Lowers heating and cooling costs year-round
  • Reflects 96% radiant heat
  • Costs less to install
  • Lightweight and clean
  • Does not promote nesting of insects or rodents
  • Resists growth of fungi, mold and mildew
  • Does not require protective clothing or respirators to install
  • ISO 9001:2015 certified manufacturing location
  • Not affected by moisture or humidity

Part Numbers and Sizes

  • HVBP12050 (12”x 50’)
  • HVBP16050 (16”x 50’)
  • HVBP24050 (24”x 50’)
  • HVBP36050 (36”x 50’)
  • HVBP48050 (48”x 50’)
  • HVBP60050 (60”x 50’)
  • HVBP12100 (12”x 100’)
  • HVBP16100 (16”x 100’)
  • HVBP24100 (24”x 100’)
  • HVBP36100 (36”x 100’)
  • HVBP48100 (48”x 100’)
  • HVBP60100 (60”x 100’)
  • HVBP12125 (12”x 125’)
  • HVBP16125 (16”x 125’)
  • HVBP24125 (24”x 125’)
  • HVBP36125 (36”x 125’)
  • HVBP48125 (48”x 125’)
  • HVBP60125 (60”x 125’)

Technical Data

  • Temperature Range: -30 to 180 F
  • Nominal Thickness: 5/16 inch (.312)
  • Weight: 0.771 oz./sq. ft.
  • Flame Spread Index (ASTM E 84): Less than 25
  • Smoke Developed Index (ASTM E 84): Less than 50
  • Fire Rating: Class A/Class 1
  • Linear Shrinkage: None
  • Reflectance (IR): 96%
  • Water Vapor Transmission (ASTM E 96): 0.02
  • Puncture Resistance: 60 lb./in.
  • Mold and Mildew: No Growth
  • Emittance: 0.04
  • Tensile Strength: 3.7 N/mm
  • Pliability: No Cracking
  • Hot Surface Performance: Passed (250 F)

Note: Not for use in direct contact on surface temperatures that are 180 F or greater.

Testing and Certification

  • Thermal Performance ASTM C335
  • Hot Surface Performance ASTM C411
  • Flame Spread and Smoke Density ASTM E84
  • Fungus Resistance Mil-Std 810B Method 508
  • Pliability Test ASTM C1224
  • Sound Absorption Test ASTM C423 and ASTM E795
  • Sound Transmission Loss ASTM E90 and ASTM E413
  • Water Vapor Transmission ASTM E96
  • Tensile Strength ASTM D751
  • Bleeding and Delamination ASTM C1668
  • Intertek: Surface Burning Characteristics of Building Materials ASTM E84-08 (Taped Joint Detail) Test Report # 3166908SAT-012
  • Intertek: Surface Burning Characteristics of Building Materials ASTM E84-08 (Unslit) Test Report # 3166908SAT-011
  • R&D Services: Resistance to the Growth of Fungi ASTM C1338-00 Test Report # RD072713FR
  • State of California
  • State of California Licensed Insulation Manufacturer
  • State of Minnesota: Filed with Minnesota Insulation Standards Program
  • R&D Services Emittance Testing ASTM C1371
  • R&D Services: Physical Properties Sheet Width, Length, Pliability, Water Vapor Permanence and Aged Water Vapor Permanence
  • R&D Services: Water Vapor Transmission Test ASTM-E96 (Dessicant Method)

Installation Instructions

Note: Installation instructions and illustrated drawings are recommendations only, while proper local construction methods are the responsibility of the installer.

Spacer Wrapped in a Candy Cane Fashion

Spacer: HVSPW02025 – Reflectix® Spiral Pipe Wrap 2”x 25’

  • Refer to the two diagrams above.
  • Make sure all sheet metal joints, seams and penetrations are sealed.
  • Wrap and secure spacer material to the duct in a candy cane fashion. Proceed down the duct in one direction with a repeat of the wrap at 12” intervals. Use a UL 181 approved tape to fasten the spacer in place.
  • Verify the circumference of the duct with the spacer strip in place.
  • Cut the Reflectix® product to this length plus 1”.
  • Wrap the product around the duct and securely tape the linear and circumference seams (overlapping 1”- 2”) with a UL 181 approved tape (goal is an air-tight, snug seam seal).
  • Do not leave any exposed duct or space where air can enter between the duct and the Reflectix®.

Please Note Regarding Hangers:

Strap Hanger: Wrap Reflectix® with the seam at the hanger. Tape seam tightly around hanger.

Saddle Hanger: Make sure that there is a spacer below the hanger between the insulation and the duct to prevent the insulation from touching the duct.


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).


Pictured: 1. Double Reflective Insulation, 2. Taping the Seam with a UL 181 Tape