R- 5, 1-in x 4-ft x 8-ft Residential Sheathing Tongue and Groove Faced Polystyrene For Use In Garage Doors Board Insulation Sound Barrier. Model # 202631. Find My Store. for pricing and availability. 41. R- 1.5, 0.5-in x 4-ft x 8-ft Faced Fiberboard Board Insulation Sound Barrier. Model # A11240848096.