How do I determine the R-value I need for my project?

The R-value of foam board insulation refers to its resistance to heat flow. Consult local building codes and consider your climate to determine the required R-value for your project. Higher R-values provide better insulation.

When should I use foam board insulation?

Foam board insulation is ideal for various applications, including <a href="https://www.homedepot.com/b/Building-Materials-Insulation-Foam-Board-Insulation/Exterior-Wall-Foundation/N-5yc1vZbaxxZ1z0uuau?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">foundation walls</a>, <a href="https://www.homedepot.com/b/Building-Materials-Insulation-Foam-Board-Insulation/Attic/N-5yc1vZbaxxZ1z1bkhc?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">attic floors</a>, <a href="https://www.homedepot.com/b/Building-Materials-Insulation-Foam-Board-Insulation/Crawlspace/N-5yc1vZbaxxZ1z1bkee?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">crawl spaces</a>, and <a href="https://www.homedepot.com/b/Building-Materials-Insulation-Foam-Board-Insulation/Exterior-Wall/N-5yc1vZbaxxZ1z1bla8?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">exterior walls</a>. It provides a moisture barrier, which is especially beneficial in areas where moisture is a concern.

What are some of the top-rated foam board insulation?

One of our top-rated foam board insulation is the <a href="https://www.homedepot.com/p/SilveRboard-1-in-x-2-ft-x-48-in-R5-Radiant-Acoustic-Insulation-Kit-STC-19-12-sheets-96-sq-ft-SB12AKIT/205975329?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">1 in. x 2 ft. x 48 in. R5 Radiant Acoustic Insulation Kit - STC 19 (12 sheets) - 96 sq. ft.</a>.

Ceiling Insulation - Foam Board Insulation

3/4 in. x 1.25 ft. x 4 ft. R-2.65 Polystyrene Panel Insulation Sheathing (6-Pack)

(4.5 / 362)

Model# 150705

$1098

/package

Buy 10 or more $9.88

Top Rated

Pro Select R-Matte Plus-3, 0.5 in. x 48 in. x 8 ft. R-3.2 ISO Rigid Foam Board Insulation

+more available options

RMAX
Pro Select R-Matte Plus-3, 0.5 in. x 48 in. x 8 ft. R-3.2 ISO Rigid Foam Board Insulation

(4.6 / 931)

Model# 637902

$2788

Buy 10 or more $25.09

SilveRboard
1 in. x 2 ft. x 48 in. R5 Radiant Acoustic Insulation Kit - STC 19 (12 sheets) - 96 sq. ft.

(4.5 / 351)

Model# SB12AKIT

$9732

/package

SilveRboard
R10 High Density 35 PSI Under Slab Insulation Kit - (10 Sheets) 2 in. x 2 ft. x 4 ft. - 80 sq. ft.

(5 / 3)

Model# SB35S200424KIT

$26368

Top Rated

SilveRboard
0.625 in. x 48 in. x 24 in. 72 sq. ft. R-3 Graphite Radiant Barrier Wall Insulation Kit (9-Sheets/Kit)

(4.5 / 33)

Model# SBGXS062502PKIT

$5994

New

Cellofoam
Poly Panel 3/4 in. x 1.2 ft. x 4 ft. R-2.9 Insulating Sheathing (12-Pack) Rigid Foam Board Insulation

Model# Cellofoam

$2398

/carton

STYRO Industries
19 in. x 150 ft. Sticky Mesh Heavy Duty

(4.2 / 71)

Model# SM19

$10935

STYRO Industries
38 in x 150 ft Sticky Mesh Heavy Duty

(4.2 / 71)

Model# SM38

$20117

STYRO Industries
9-1/2 in. x 150 ft. Sticky Mesh Heavy Duty

(4.2 / 71)

Model# SM9

$6969

New

Angel Sar
4 in. x 20 ft. x 0.01 in. R-1 EPS Waterproof Polyethylene RV Underbelly Tape Roll, Tear Repair Patch Flex Belly Tape

Model# JG61OD66

$5666

/package

Attic insulation improves home energy efficiency and comfort. Get started with a free consultation for stress-free and mess-free professional installation.

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Foam Board Insulation

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Department

Product Thickness (in.)

0.01 in

0.08 in

0.5 in

0.63 in

0.75 in

1 in

2 in

Sheathing Type

EPS

ISO

Insulation Location

Basement

2x4 Wall

Attic

Garage

Exterior Sheathing