At a Glance

Coverage Area: 32 (sq ft)

Mold Resistant

Water Resistant

Ask Mylow

Mylow is an AI virtual assistant.

More Information

Is it mold resistant?What is the warranty coverage?Can I use it in basements?How do I install this insulation?What tools are needed for installation?

R- 3.9 , 1-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

4.6

855

Get Pricing & Availability

Members save more.

Best Price. Guaranteed

Find a lower price on an exact item? We'll match it. Some exclusions apply.

Price Guarantee

FREE Returns

Return it in store or ship it back for free. Eligibility rules apply.

Return Policy

FREE Shipping

Delivery is on us for orders over $45. Some exclusions apply.

Shipping Details

General
Package Quantity	1	Insulation Type	Polystyrene
Use Location	Indoor/Outdoor

Dimensions
Common Length (Feet)	8	Package Weight (lbs.)	53.3
Actual Thickness (Inches)	1	Coverage Area (Sq. Feet)	32
Actual Width (Feet)	4	Actual Length (Feet)	8
Common Thickness (Inches)	1	R-Value per Inch	3.9
Common Width (Feet)	4	Maximum R-Value	3.9

Features
Fire Resistant	No	Vapor Retardant	Yes
Mold Resistant	Yes	Formaldehyde Free	Yes
Sound Barrier	No	Facing Material	Faced
Water Resistant	Yes

Certifications
CA Residents: Prop 65 Warning(s)	No	ENERGY STAR Certified	No

Warranty
Warranty	Limited lifetime

Compatibility
Fits 2 x 4 Walls	Yes	For Use in Doors	No
Fits 2 x 6 Walls	Yes	For Use in Floors	No
For Use on Wood	Yes	For Use in Garage Doors	Yes
For Use on Glass	Yes	For Use on Metal	Yes
For Use in Basements	Yes	For Use in Masonry	Yes
For Use in Attics	Yes	For Use on Plastic	Yes
For Use on Insulation	Yes	For Use in Plumbing	No
For Use in Crawlspaces	Yes	For Use in Walls	Yes
For Use in Ceilings	Yes	For Use in Vents	No
For Use in Electrical	No	For Use in Windows	Yes
For Use in Duct	No

Miscellaneous
UNSPSC	30141500

Check out the Best Selling Board Insulation on Lowes.com

Review

4.6 out of 5

855 Reviews

92% Recommend this product

Ratings may include incentivized customer reviews.

+ 33

What Customers Are Saying

The insulation is easy to work with, sturdy, and effective at reducing drafts and temperature fluctuations. Customers found the product to be of good value and convenient to use. However, some reported issues with damaged or inferior products being shipped.

Customer review summary generated by AI, including incentivized reviews.

855 Customer Reviews

Sort By

Material is fone

Would Recommend

Product is fine. It is what I thought I was getting and it did what I wanted. The review is about Lowe’s and their crap service. Delivery was pushed out three times, with nobody calling to update, and after having received “delivery window” notes in the morning. After the second delay a complaint was filed and it STILL didn’t deliver on the third “delivery day” costing me more in labor that I had waiting to work, and causing overtime charges to get the project ready for a hard install date I’ve ...

MelanieJuly 26, 2026
From R- 3.9 , 1-in x 4-ft x 8-ft Faced Polystyrene Board Insulation Verified Purchaser

Was this Review Helpful ?

398 Questions

Sort By

R- 3.9 , 1-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

Overview

Product Features

Specifications

Community Q & A

Featured Videos

RELATED SEARCHES

Board Insulation

Polystyrene Board Insulation

1 Pack Board Insulation

8 Pack Board Insulation

8 Foot Long Board Insulation

4 Foot Long Board Insulation

1 Inch Wide Roll Insulation

4 Sq. Foot Coverage Area Board Insulation

4 Foot Wide House Wrap

Top Rated Board Insulation

4 Foot Long Roll Insulation

32 Pack Board Insulation

4 Inch Wide Roll Insulation

8 Foot Wide House Wrap

32 Sq. Foot Coverage Area Board Insulation