What is foam board insulation, and what is it used for?

Foam board insulation is a rigid panel made from expanded polystyrene (EPS), extruded polystyrene (XPS), or polyisocyanurate (polyiso). It improves a home's energy efficiency by reducing heat loss or gain through walls, floors, and roofs.

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/STYRO-Industries-FP-Ultra-Lite-2-in-x-2-ft-x-4-ft-Stucco-Grey-Foundation-Panel-SFL-200-2103/203929090?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">FP Ultra Lite 2 in. x 2 ft. x 4 ft. Stucco Grey Foundation Panel</a>.

What kind of adhesive do I need to attach foam board insulation to my walls?

Most foam board insulation is designed to be attached to a construction adhesive and is available in tubes or cartridges. Ensure the adhesive is specifically designed for foam insulation and the surface to which it is attached.

Mold Resistant - Foam Board Insulation

Owens Corning
FOAMULAR NGX Insulating Sheathing 0.5 in. x 4 ft. x 8 ft. SE R-3 XPS Rigid Foam Board Insulation

(4.7 / 913)

Model# 13NGX

$2297

Buy 10 or more $20.67

Owens Corning
FOAMULAR NGX F-150 1 in. x 4 ft. x 8 ft. SSE R-5 XPS Rigid Foam Board Insulation

(4.7 / 913)

Model# 20WENGX

$3197

Buy 10 or more $28.77

Best Seller

Owens Corning
FOAMULAR NGX F-250 2 in. x 4 ft. x 8 ft. SSE R-10 XPS Rigid Foam Board Insulation

(4.7 / 913)

Model# 52DDNGX

$5997

Buy 10 or more $53.97

Owens Corning
FOAMULAR NGX 1 in. x 2 ft. x 2 ft. R-5 Project Panel XPS Rigid Foam Board Insulation

(4.7 / 913)

Model# 9WE

$997

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

STYRO Industries
FP Ultra Lite 2 in. x 2 ft. x 4 ft. Stucco Grey Foundation Panel

(4.5 / 70)

Model# SFL-200-2103

$4198

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

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

Henry
Single-Ply Roofing Closed-Cell Rigid Foam Polyiso Insulation 1.75 in. x 4 ft. x 8 ft. (32 sq. ft.)

Model# HE1622436

$3397

STYRO Industries
FP Ultra Lite 2 in. x 2 ft. x 4 ft. Natural Tan Foundation Panel

(3.6 / 18)

Model# SFL-200-2102

$4198

STYRO Industries
FP Ultra Lite 2 in. x 2 ft. x 4 ft. Earth Tone Brown Foundation Panel

(4.1 / 35)

Model# SFL-200-2101

$4198

Foam Board Insulation

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Department

Product Thickness (in.)

0.08 in

0.5 in

0.63 in

1 in

1.5 in

1.75 in

2 in

2.5 in

3 in

4 in

Sheathing Type

XPS

EPS

ISO

Insulation Location

Basement

2x4 Wall

Attic

Garage

Exterior Sheathing

Exterior Wall Foundation

Interior Wall

Ceiling Insulation

Exterior Wall

Crawlspace

Interior Ceiling

Under Slab

Wood Siding

2x6 Wall

2x8 Wall

Metal Building

Re-Siding

Roof

Insulation R-Value

R10

R7.5

R5

R10.00

R12.5

R15

R20

R3.0

R3

Faced or Unfaced

Unfaced

Faced

Insulation Features

Mold Resistant

Formaldehyde Free

Soundproofing Insulation

Water Resistant

Moisture Retardant

Paintable

Vapor Retardant

Pack Size

1

9

Eco Friendly

Energy Star

Special Order

Special Order Eligible

Owens Corning FOAMULAR NGX Insulating Sheathing 0.5 in. x 4 ft. x 8 ft. SE R-3 XPS Rigid Foam Board Insulation

Owens Corning FOAMULAR NGX F-150 1 in. x 4 ft. x 8 ft. SSE R-5 XPS Rigid Foam Board Insulation

Owens Corning FOAMULAR NGX F-250 2 in. x 4 ft. x 8 ft. SSE R-10 XPS Rigid Foam Board Insulation

Owens Corning FOAMULAR NGX 1 in. x 2 ft. x 2 ft. R-5 Project Panel XPS Rigid Foam Board Insulation

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

STYRO Industries FP Ultra Lite 2 in. x 2 ft. x 4 ft. Stucco Grey Foundation Panel

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

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

STYRO Industries 38 in x 150 ft Sticky Mesh Heavy Duty

Henry Single-Ply Roofing Closed-Cell Rigid Foam Polyiso Insulation 1.75 in. x 4 ft. x 8 ft. (32 sq. ft.)

STYRO Industries FP Ultra Lite 2 in. x 2 ft. x 4 ft. Natural Tan Foundation Panel

STYRO Industries FP Ultra Lite 2 in. x 2 ft. x 4 ft. Earth Tone Brown Foundation Panel

Support

Owens Corning
FOAMULAR NGX Insulating Sheathing 0.5 in. x 4 ft. x 8 ft. SE R-3 XPS Rigid Foam Board Insulation

Owens Corning
FOAMULAR NGX F-150 1 in. x 4 ft. x 8 ft. SSE R-5 XPS Rigid Foam Board Insulation

Owens Corning
FOAMULAR NGX F-250 2 in. x 4 ft. x 8 ft. SSE R-10 XPS Rigid Foam Board Insulation

Owens Corning
FOAMULAR NGX 1 in. x 2 ft. x 2 ft. R-5 Project Panel XPS Rigid Foam Board Insulation

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

STYRO Industries
FP Ultra Lite 2 in. x 2 ft. x 4 ft. Stucco Grey Foundation Panel

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

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

STYRO Industries
38 in x 150 ft Sticky Mesh Heavy Duty

Henry
Single-Ply Roofing Closed-Cell Rigid Foam Polyiso Insulation 1.75 in. x 4 ft. x 8 ft. (32 sq. ft.)

STYRO Industries
FP Ultra Lite 2 in. x 2 ft. x 4 ft. Natural Tan Foundation Panel

STYRO Industries
FP Ultra Lite 2 in. x 2 ft. x 4 ft. Earth Tone Brown Foundation Panel