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.

Will foam board insulation resist mold growth?

Many foam board insulation products are <a href="https://www.homedepot.com/b/Building-Materials-Insulation-Foam-Board-Insulation/Mold-Resistant/N-5yc1vZbaxxZ1z1bjgs?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">mold-resistant</a>, especially in humid areas or spaces prone to moisture build-up. They also prevent condensation, further minimizing the risk of mold growth.

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-19-in-x-150-ft-Sticky-Mesh-Heavy-Duty-SM19/203009646?emt=plpfaq_2410_foamboardinsulation" style="text-decoration: underline;">19 in. x 150 ft. Sticky Mesh Heavy Duty</a>.

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.

Can I use foam board insulation on the exterior of my house?

Yes, you can use foam board insulation on the exterior of your house for added protection against the elements. However, choose a foam board for exterior applications, as some may not withstand UV exposure.

Unfaced - 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

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

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

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

(4.7 / 417)

Model# 21UM

$6497

Buy 10 or more $58.47

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

(4.7 / 374)

Model# 36L

$2297

Buy 10 or more $20.67

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

(4.7 / 1161)

Model# 20WE

$3197

Buy 10 or more $28.77

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

Owens Corning
FOAMULAR R3 1/2 in. x 4 ft. x 8 ft. Squared Edge Foam

Model# 3UR

$2297

Buy 10 or more $20.67

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

Henry
Single-Ply Roofing Closed-Cell Rigid Foam Polyiso Insulation 2.6 in. x 4 ft. x 8 ft. (32 sq. ft.)

Model# HE1622435

$5197

Foam Board Insulation

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Department

Product Thickness (in.)

0.01 in

0.08 in

0.25 in

0.5 in

0.75 in

1 in

1.5 in

1.75 in

2 in

2.38 in

2.5 in

2.6 in

3 in

4 in

Sheathing Type

XPS

EPS

ISO

Insulation Location

Basement

2x4 Wall

Attic

Garage

Exterior Sheathing

Interior Wall

Ceiling Insulation

Exterior Wall Foundation

Exterior Wall

2x6 Wall

Under Slab

2x8 Wall

Camper/RV/Trailer

Crawlspace

Interior Ceiling

Water Tank

Wood Decking

Wood Siding

Floor

Re-Siding

Roof

Insulation R-Value

R10

R7.5

R5

R15

R1

R3

R10.00

R12.5

R2.65

R2.8875

R20

Faced or Unfaced

Unfaced

Faced

Insulation Features

Mold Resistant

Formaldehyde Free

Soundproofing Insulation

Water Resistant

Moisture Retardant

Pre-Cut

Vapor Retardant

Pack Size

1

4

8

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

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

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

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

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

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

Owens Corning
FOAMULAR R3 1/2 in. x 4 ft. x 8 ft. Squared Edge Foam

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

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

Henry
Single-Ply Roofing Closed-Cell Rigid Foam Polyiso Insulation 2.6 in. x 4 ft. x 8 ft. (32 sq. ft.)