Prices, Promotions, styles, and availability may vary. Our local stores do not honor online pricing. Prices and availability of products and services are subject to change without notice. Errors will be corrected where discovered, and Lowe's reserves the right to revoke any stated offer and to correct any errors, inaccuracies or omissions including after an order has been submitted.

Polystyrene Water Resistant Insulation & Accessories

25 results

Energy Star Qualified

Owens Corning FOAMULAR NGX F-150 R- 7.5 , 4-ft x 8-ft Unfaced Polystyrene Board Insulation

Find My Store

for pricing and availability

4.7
99

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

Find My Store

for pricing and availability

4.4
195
Energy Star Qualified

STYROFOAM Residential Sheathing R- 5 , 1-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

Find My Store

for pricing and availability

4.4
26

Perma "R" Products R- 7.8 , 2-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

Find My Store

for pricing and availability

4.5
38

 R- 2.9 , 0.75-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

Find My Store

for pricing and availability

4.4
195
Energy Star Qualified

STYROFOAM Residential Sheathing R- 2.75 , 0.55-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

Find My Store

for pricing and availability

4.3
25
Energy Star Qualified

STYROFOAM Residential Sheathing R- 3.9 , 0.78-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

Find My Store

for pricing and availability

4.9
28

 HALO GPS R- 5 , 1.063-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

Find My Store

for pricing and availability

4.6
11