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.

Can I use foam board insulation in my attic?

Foam board insulation is great for <a href="https://www.homedepot.com/b/Building-Materials-Insulation-Foam-Board-Insulation/Attic/N-5yc1vZbaxxZ1z1bkhc?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">attics</a> as it provides an excellent thermal barrier and can be easily attached to the roof sheathing. Its moisture-resistant properties also help prevent condensation and potential damage.

Which foam board insulation is the top-rated?

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 top-rated foam board insulation.

Why is foam board insulation so popular?

Foam board insulation is popular because it has some excellent features that make it a great choice for many projects, like <a href="https://www.homedepot.com/b/Building-Materials-Insulation-Foam-Board-Insulation/Plywood/Formaldehyde-Free/N-5yc1vZbaxxZ1z1bjg2Z1z1bjik?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">formaldehyde free</a>, <a href="https://www.homedepot.com/b/Building-Materials-Insulation-Foam-Board-Insulation/Plywood/Mold-Resistant/N-5yc1vZbaxxZ1z1bjg2Z1z1bjgs?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">mold resistant</a>, and <a href="https://www.homedepot.com/b/Building-Materials-Insulation-Foam-Board-Insulation/Plywood/Vapor-Retardant/N-5yc1vZbaxxZ1z1bjdiZ1z1bjg2?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">vapor retardant</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.

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

(4.6 / 88)

Model# 13NGX

$1897

Buy 10 or more $17.07

Owens Corning
FOAMULAR 1/2 in. x 4 ft. x 8 ft. R-3 Square Edge Rigid Foam Board Insulation Sheathing

(4.8 / 240)

Model# 36L

$1897

Buy 10 or more $17.07

+more available options

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

(4.7 / 139)

Model# 20WENGX

$3197

Buy 10 or more $28.77

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

(4.6 / 495)

Model# 320821

$1598

Buy 10 or more $14.38

Owens Corning
FOAMULAR 150 1 in. x 4 ft. x 8 ft. R-5 Scored Square Edge Rigid Foam Board Insulation Sheathing

(4.7 / 600)

Model# 20WE

$3197

Buy 10 or more $28.77

Owens Corning
FOAMULAR 150 2 in. x 4 ft. x 8 ft. R-10 Scored Squared Edge Rigid Foam Board Insulation Sheathing

(4.8 / 285)

Model# 45W

$5397

Buy 10 or more $48.57

Owens Corning
FOAMULAR 150 2 in. x 4 ft. x 8 ft. R-10 Unfaced Squared Edge Insulation Sheathing

(4.8 / 285)

Model# 6W

$5397

Buy 10 or more $48.57

Best Seller

+more available options

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

(4.7 / 143)

Model# 52DDNGX

$6497

Buy 10 or more $58.47

Owens Corning
FOAMULAR 1/4 in. x 4 ft. x 50 ft. R-1 Fanfold Rigid Foam Board Insulation Sheathing

(4.5 / 145)

Model# 21UM

$6497

Buy 10 or more $58.47

+more available options

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

(4.7 / 210)

Model# 9WE

$997

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

(4.5 / 342)

Model# SB12AKIT

$9031

/package

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 / 126)

Model# AMDKIT001

$16526

Foam Board Insulation

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Department

Product Thickness (in.)

0.25 in

0.5 in

0.63 in

1 in

2 in

2.38 in

Sheathing Type

XPS

EPS

Insulation Location

Basement

2x4 Wall

Attic

Garage

Exterior Sheathing

Crawlspace

2x6 Wall

Exterior Wall Foundation

Re-Siding

2x8 Wall

Ceiling Insulation

Exterior Wall

Metal Building

Under Slab

Floor

Interior Wall

Insulation R-Value

R10

R5

R3

R1

R3.0

R3.85

Faced or Unfaced

Unfaced

Faced

Insulation Features

Mold Resistant

Formaldehyde Free

Soundproofing Insulation

Water Resistant

Moisture Retardant

Vapor Retardant

Structural

Pack Size

1

4

8

9

12

48

Eco Friendly

Energy Star

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 1/2 in. x 4 ft. x 8 ft. R-3 Square Edge Rigid Foam Board Insulation Sheathing

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

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

Owens Corning FOAMULAR 150 1 in. x 4 ft. x 8 ft. R-5 Scored Square Edge Rigid Foam Board Insulation Sheathing

Owens Corning FOAMULAR 150 2 in. x 4 ft. x 8 ft. R-10 Scored Squared Edge Rigid Foam Board Insulation Sheathing

Owens Corning FOAMULAR 150 2 in. x 4 ft. x 8 ft. R-10 Unfaced Squared Edge Insulation Sheathing

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 1/4 in. x 4 ft. x 50 ft. R-1 Fanfold Rigid Foam Board Insulation Sheathing

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

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

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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 1/2 in. x 4 ft. x 8 ft. R-3 Square Edge Rigid Foam Board Insulation Sheathing

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

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

Owens Corning
FOAMULAR 150 1 in. x 4 ft. x 8 ft. R-5 Scored Square Edge Rigid Foam Board Insulation Sheathing

Owens Corning
FOAMULAR 150 2 in. x 4 ft. x 8 ft. R-10 Scored Squared Edge Rigid Foam Board Insulation Sheathing

Owens Corning
FOAMULAR 150 2 in. x 4 ft. x 8 ft. R-10 Unfaced Squared Edge Insulation Sheathing

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 1/4 in. x 4 ft. x 50 ft. R-1 Fanfold Rigid Foam Board Insulation Sheathing

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

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