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Reflectix 16 in. x 50 ft. Reflective Radiant Barrier Foil Insulation Roll

Reflectix 16 in. x 50 ft. Reflective Radiant Barrier Foil Insulation Roll

Best price now

$36.70at Max WarehouseObserved at 3:05 PM

29% under what the other stores charge

Compared across 6 stores. Prices are checked against each store and labelled with when.

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Our take on the Reflectix 16 in. x 50 ft. Reflective Radiant Barrier Foil Insulation Roll

Reflectix is a double-sided aluminum foil radiant barrier on a bubble core, sold here as a 16 in. x 50 ft. roll covering 67 sq. ft. It blocks radiant heat rather than slowing conductive heat, so it works best stapled under rafters, over attic floor joists or behind walls with an air gap. Reflectix rates it R-3.7 to R-21 depending on how it is installed, and it also acts as a vapor retarder. At $11.17 at eBay as of November 4, 2026, it sits at the low end of its recent range across 6 stores.

Best forAttic radiant heat control in hot climatesGarage doors, sheds and metal buildingsWrapping ducts, water heaters and pipesDIYers who want a light, no-mask roll
Pros
  • Light and easy to cut with scissors or a utility knife
  • Double duty: radiant barrier plus vapor retarder
  • Class A / Class 1 fire rating
  • Staples or glues to wood framing
  • No fiberglass itch or respirator needed
Cons
  • R-value collapses to about R-3.7 without an air gap
  • Bubble foil does little for conductive heat loss in cold climates
  • Foil can tear and creases hold shape
  • Not a substitute for mass insulation in most assemblies

Reflectix 16 in. x 50 ft. Reflective Radiant Barrier Foil Insulation Roll prices at every store

  • Max WarehouseNew

    In stock

    $36.70Observed at 3:05 PM
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  • Opentip.comNew

    In stock

    $38.30Observed at 3:05 PM
    Visit store
  • MROSupreme.comNew

    In stock

    $39.80Observed at 3:05 PM
    Visit store
  • eBayNew

    In stockSold by championtvsales

    $59.45Observed at 3:05 PM
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  • WalmartNew

    In stockSold by Giving Goods

    $65.98Observed at 3:05 PM
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  • Lowe'sNew

    Availability unknown

    $51.48Observed at 3:05 PM
    Visit store

Also available at

  • eBayCheck price at eBay
  • Ace HardwareCheck price at Ace Hardware
  • DK HardwareCheck price at DK Hardware
  • Home Essentials DirectCheck price at Home Essentials Direct
  • Store SevenCheck price at Store Seven
  • ZoroCheck price at Zoro

Reflectix 16 in. x 50 ft. Reflective Radiant Barrier Foil Insulation Roll price history

Lowest price we've seen: $36.70 on Nov 4 at Max Warehouse. Tracked across 11 stores since Nov 4.

What reviewers say

Owners use it mostly in attics and on garage doors and report noticeable heat reduction when it faces an air space. Complaints center on thinness, tearing during install and unrealistic R-value expectations.

Pros
  • Cuts attic heat noticeably when stapled under rafters
  • Easy to handle solo on a ladder
  • Holds up on garage doors and metal sheds
Cons
  • Tears easily if pulled tight over staples
  • Falls short of advertised R-value when sandwiched
  • Foil surface shows creases and dents

Specifications

R-Value
R-3.7 to R-21
Thermal Resistance
R-3.7 to R-21
Form
Roll
Moisture Resistance
Inhibits condensation
Fire Rating Class
Class A, Class 1
Product Type
Reflective Radiant Barrier Foil Insulation Roll
Insulation Type
Thermal
Insulated Plasterboard
No
Reflective Type
Reflective Radiant Barrier
Thermal Type
Radiation
Material Type
Reflective Foil
Facing
Foil
Material Composition
Aluminum
Vapor Retarder
Yes, Vapor retardant
Coverage Area
67 sq. ft.
Thickness
0.31 in.
Length
50 ft.
Roll Size
16 x 50 ft.
Width
16 in.
Application
Insulation
Recommended Usage
Residential, Commercial
Suitable Surfaces
Walls, Attics
Color
No color

Questions and answers

Is Reflectix worth it for an attic?
Yes for radiant heat in sunny climates, if you leave an air gap facing the hot side. It will not replace blown-in insulation for winter heat loss.
What R-value does it really deliver?
Reflectix rates the roll R-3.7 to R-21 depending on the assembly. The high number needs a reflective air space; sandwiched between materials you get roughly R-3.7.
Can it go directly against the roof deck?
No. Foil against a surface loses its radiant benefit and can trap moisture. Staple it under the rafters with the shiny side facing the open attic.
How much area does one roll cover?
One 16 in. x 50 ft. roll covers 67 sq. ft. Measure your joist bays or door panels and expect some overlap waste at seams.
Is it a vapor barrier?
It is a vapor retarder, so place it on the warm side of the assembly. In cold climates that means the interior side, with seams taped.
When is it cheapest?
The $11.17 eBay price as of November 4, 2026 is near the bottom of its recent range. Roll prices move little, so buy when you have the full project measured.
Where is the Reflectix 16 in. x 50 ft. Reflective Radiant Barrier Foil Insulation Roll cheapest?
At Max Warehouse, for $36.70, 29% under what the other stores charge, as of our latest check.
Where can I buy the Reflectix 16 in. x 50 ft. Reflective Radiant Barrier Foil Insulation Roll?
11 stores we checked sell it, including Max Warehouse, Opentip.com, MROSupreme.com, Lowe's, eBay.

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