At a Glance

Coverage Area: 16 (sq ft)

Mold Resistant

Water Resistant

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R-Tech R- 5.78 , 1.5-in x 2-ft x 8-ft Expanded polystyrene Board Insulation

Name: R-Tech R- 5.78 , 1.5-in x 2-ft x 8-ft Expanded polystyrene Board Insulation
Brand: R-Tech
SKU: 3014678
Rating: 4.1 (10 reviews)

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4.1

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General
Package Quantity	1	Insulation Type	Expanded polystyrene
Use Location	Indoor/Outdoor

Dimensions
Common Length (Feet)	8	Package Weight (lbs.)	2
Actual Thickness (Inches)	1.5	Coverage Area (Sq. Feet)	16
Actual Width (Feet)	2	Actual Length (Feet)	8
Common Thickness (Inches)	1.5	R-Value per Inch	3.85
Common Width (Feet)	2	Maximum R-Value	5.78

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

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

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

Miscellaneous
UNSPSC	30141500

Check out the Best Selling Board Insulation on Lowes.com

Review

4.1 out of 5

10 Reviews

3 Star

2 Star

88% Recommend this product

Ratings may include incentivized customer reviews.

10 Customer Reviews

Sort By

Roof support

Would Recommend

Used for support in my enclosed trailer so the roof didn't have so much flex to it

AnnewJune 3, 2026
Verified Purchaser

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Igloo maker

Would Recommend

Cuts easily and was perfect to make an igloo for Christmas decor.

M espDecember 19, 2024
Verified Purchaser

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Preferred insulation for dog houses

Would Recommend

Benefit of foam insulation, with added radiant barrier. I used doubled-up, back to back to insulate a doghouse. 2 thicknesses fit nicely in 2"x4" stud wall. Solid panel a good air and moisture barrier. Radiant barrier facing out to reduce summer solar gain, facing in to help keep warmth inside during winter. Cuts nicely with a table saw, or messy with a utility knife "score then snap."

LemonCoveJanuary 28, 2023
Verified PurchaserVerified Pro

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Chemical smell

Would Not Recommend

After placing in my RV window to block summer sun within 1 month it's putting off a chemical smell

SammJuly 7, 2021

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Basement insulation project

Would Recommend

Easy to score and cut. A bit messy but will help keep basement warmer.

ReluctantDIYerNovember 25, 2019
Verified PurchaserSweepstakes

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R-Tech: Featured Videos

COMPARE PRODUCTS

		Name	Current Item R-TechR- 5.78 , 1.5-in x 2-ft x 8-ft Expanded polystyrene Board Insulation
		Ratings	10
		Insulation Type	Expanded polystyrene
		Actual Thickness (Inches)	1.5
		Common Thickness (Inches)	1.5
Kingspan InsulationR- 4 , 4-ft x 8-ft Unfaced Polystyrene Board Insulation	Perma "R" ProductsR- 7.8 , 2-in x 4-ft x 8-ft Faced Polystyrene Board Insulation	R- 1.5-in x 4-ft x 8-ft Expanded polystyrene	R-TechR- 7.7 , 2-in x 2-ft x 8-ft Faced Polystyrene Board Insulation	STYROFOAMUnsheathed R- 10 , 2-in x 4-ft x 8-ft Unfaced Polystyrene Board Insulation	STYROFOAMResidential Sheathing R- 5 , 1-in x 4-ft x 8-ft Faced Polystyrene Board Insulation	Kingspan InsulationR- 5 , 1-in x 4-ft x 8-ft Unfaced Foam Board Insulation	STYROFOAMResidential Sheathing R- 3.9 , 0.78-in x 4-ft x 8-ft Faced Polystyrene Board Insulation	Kingspan InsulationR- 3.75 , 0.75-in x 4-ft x 8-ft Unfaced Foam Board Insulation
91	920	789	8	172	172	168	172	59
Polystyrene	Polystyrene	Expanded polystyrene	Polystyrene	Polystyrene	Polystyrene	Foam	Polystyrene	Foam
0	2	1.4375	2	2	1	1	0.78	0.75
0	2	1.5	2	2	1	1	0.78	0.75