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Rmax Pro Select R-Matte Plus-3 48 in. x 8 ft ISO Rigid Foam Board Insulation

Rmax Pro Select R-Matte Plus-3 48 in. x 8 ft ISO Rigid Foam Board Insulation

4.5· 764 ratings

Best price now

$15.27at Home DepotObserved at 3:54 PM

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Our take on the Rmax Pro Select R-Matte Plus-3 48 in. x 8 ft ISO Rigid Foam Board Insulation

Rmax R-Matte Plus-3 is a 3/4-inch rigid polyiso foam board with a reflective foil facing on one side, sold in 4 ft by 8 ft panels covering 32 sq ft. It delivers R5.0 and doubles as a radiant barrier and a water-resistive barrier, and it is ENERGY STAR qualified for above- and below-grade use. At $15.27 at Home Depot as of November 4, 2026, it is the only new price listed, so there is no recent range to compare against.

Best forBasement and crawl space wall insulationRadiant barrier behind siding or in atticsAdding R-value over existing drywallGarage and rim joist insulation
Pros
  • Foil facing works as a radiant barrier
  • Rated as a water-resistive barrier
  • R5.0 in a thin 3/4-inch panel
  • Light at about 4 lb per 32 sq ft sheet
  • ENERGY STAR qualified; formaldehyde free
Cons
  • R5.0 is modest; thick walls need layers
  • Rigid panels must be cut and taped at seams
  • Foil face can scuff and needs care in handling
  • Only one store lists a new price

Rmax Pro Select R-Matte Plus-3 48 in. x 8 ft ISO Rigid Foam Board Insulation prices at every store

  • Home DepotNew

    In stock

    $15.27Observed at 3:54 PM
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Also available at

  • ubereats.comCheck price at ubereats.com
  • Core RangerCheck price at Core Ranger
  • Supply OntimeCheck price at Supply Ontime

Rmax Pro Select R-Matte Plus-3 48 in. x 8 ft ISO Rigid Foam Board Insulation price history

Lowest price we've seen: $15.27 on Nov 4 at Home Depot. Tracked across 4 stores since Nov 4.

What reviewers say

With 4.5 out of 5 from 764 ratings, owners generally find the panels easy to cut and install and useful for adding a thin layer of R-value. Complaints tend to center on boards arriving damaged or warped.

Pros
  • Cuts cleanly with a utility knife
  • Foil face reflects heat as expected
  • Light and easy to handle solo
  • Good value for a small insulation job
Cons
  • Some boards arrive bent or scuffed
  • Foil can tear at the edges
  • Thin R-value for the price per sheet

Specifications

R-Value
R5.0
Thermal Resistance
Improving thermal efficiency
Form
Boards
Product Type
Rigid Foam Board
Insulation Type
Thermal
Insulated Plasterboard
No
Reflective Type
Reflective (on one side), Radiant barrier
Moisture Resistance
Water-resistive barrier
Material Type
Foam Insulation Board
Facing
Faced
Material Composition
Formaldehyde Free
Coverage Area
32 sq ft
Thickness
0.75 in
Board Size
8 ft. x 0.75 in. x 48 in.
Length
8 ft
Width
48 in
Application
Radiant barrier
Recommended Usage
Below-grade applications, Above-grade applications
Suitable Surfaces
Wood, Cement, Existing Drywall
Certifications
ENERGY STAR qualified
Flexibility
Rigid
Compressibility
20 psi (Compressive Strength ASTM D1621)
Weight
4 lb
Color
White (on one side)

Questions and answers

Is R5.0 enough insulation?
R5.0 is a supplement, not a stand-alone wall solution. Use it over existing insulation, behind siding as a radiant barrier, or in rim joists and crawl spaces where space is tight.
Can it go below grade?
Yes. Rmax lists it for below-grade and above-grade applications, and the foil facing acts as a water-resistive barrier. Tape the seams to keep the barrier continuous.
How do I install it?
Cut with a utility knife or fine-tooth saw, press against wood, cement or drywall, and fasten with cap nails or adhesive. Tape or seal seams for the radiant barrier to work.
What is in one order?
One panel, 4 ft wide by 8 ft long by 3/4 in thick, covering 32 sq ft and weighing about 4 lb. Order the number of panels your square footage requires.
When is it cheapest?
The only new price listed is $15.27 at Home Depot as of November 4, 2026. Foam board often drops during insulation sales in fall and spring.
Where is the Rmax Pro Select R-Matte Plus-3 48 in. x 8 ft ISO Rigid Foam Board Insulation cheapest?
At Home Depot, for $15.27, as of our latest check.
What do buyers say about the Rmax Pro Select R-Matte Plus-3 48 in. x 8 ft ISO Rigid Foam Board Insulation?
Rated 4.5 out of 5 from 764 ratings.
Where can I buy the Rmax Pro Select R-Matte Plus-3 48 in. x 8 ft ISO Rigid Foam Board Insulation?
4 stores we checked sell it, including Home Depot, ubereats.com, Core Ranger, Supply Ontime.