What is the best foam board insulation for my project?

Choosing the right foam board depends on your needs. <a href="https://www.homedepot.com/b/Building-Materials-Insulation-Foam-Board-Insulation/EPS/N-5yc1vZbaxxZ1z0w1xr?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">EPS</a> is affordable and offers decent insulation, while <a href="https://www.homedepot.com/b/Building-Materials-Insulation-Foam-Board-Insulation/XPS/N-5yc1vZbaxxZ1z0w1xo?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">XPS</a> is denser and more water-resistant, making it ideal for below-grade applications. <a href="https://www.homedepot.com/b/Building-Materials-Insulation-Foam-Board-Insulation/ISO/N-5yc1vZbaxxZ1z0w1ut?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">Polyiso</a> provides the highest R-value but can be more expensive.

Which foam board insulation is the best-selling?

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> is one of our best-selling foam board insulation.

Is foam board insulation paintable?

Many foam board insulation products are <a href="https://www.homedepot.com/b/Building-Materials-Insulation-Foam-Board-Insulation/Paintable/N-5yc1vZbaxxZ1z1bjiq?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">paintable</a>, allowing you to finish the insulated surface to match your interior decor easily. Just use a primer specifically designed for foam surfaces for optimal adhesion.

Basement - 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

(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

Top Rated

Henry
1 in. x 48 in. x 8 ft. R-3.85 Insulating Sheathing

(4.6 / 1684)

Model# 320821

$1598

Buy 10 or more $14.38

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

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

Top Rated

Henry
1/2 in. x 48 in. x 8 ft. R-1.93 EPS Rigid Foam Board Insulation

(4.6 / 1684)

Model# 320810

$938

Buy 10 or more $8.44

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

Cellofoam
Poly Shield Fan-Fold .5 in. x 48 in. x 50 ft. Rigid Foam Board Laminated EPS Insulated Sheathing R-1.93

(5 / 2)

Model# B117621002507

$6698

/box

Amvic
Envirosheet H.D Insulation with drainage-2-3/8in. x 2ft. x 4ft.(8 Panels)-64 sq ft. - R10 - Ext/Int-Below/Above Grade

(4.5 / 128)

Model# AMDKIT001

$16900

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

Foam Board Insulation

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Department

Product Thickness (in.)

0.08 in

0.5 in

0.63 in

0.75 in

1 in

1.5 in

2 in

2.38 in

2.5 in

3 in

4 in

Sheathing Type

EPS

XPS

ISO

Insulation Location

Basement

2x4 Wall

Attic

Garage

Exterior Sheathing

Interior Wall

Ceiling Insulation

Exterior Wall Foundation

Crawlspace

2x6 Wall

Re-Siding

Exterior Wall

Under Slab

2x8 Wall

Interior Ceiling

Metal Building

Wood Siding

Floor

Between Walls

Insulation R-Value

R10

R7.5

R5

R1.925

R1.93

R12.5

R15

R2.65

R2.8875

R20

R3.0

R3.2

R3.85

Faced or Unfaced

Unfaced

Faced

Insulation Features

Mold Resistant

Formaldehyde Free

Soundproofing Insulation

Water Resistant

Moisture Retardant

Vapor Retardant

Structural

Pre-Cut

Pack Size

1

8

9

12

48

Eco Friendly

Energy Star

Special Order

Special Order Eligible

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

Henry 1 in. x 48 in. x 8 ft. R-3.85 Insulating Sheathing

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

Henry
1 in. x 48 in. x 8 ft. R-3.85 Insulating Sheathing

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

Henry
1/2 in. x 48 in. x 8 ft. R-1.93 EPS Rigid Foam Board Insulation

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

Cellofoam
Poly Shield Fan-Fold .5 in. x 48 in. x 50 ft. Rigid Foam Board Laminated EPS Insulated Sheathing R-1.93

Amvic
Envirosheet H.D Insulation with drainage-2-3/8in. x 2ft. x 4ft.(8 Panels)-64 sq ft. - R10 - Ext/Int-Below/Above Grade

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

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

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