Home > Shop > Lumber & Plywood > Plywood & Panels > Underlay Underlay 4x8-8.5mm CANOE FIR UNDERLAYMENT Item #: 01698705 $67.10 Add to Cart 4x8-5/16" ENSTRON UNDERLAY Item #: 01700610 $27.90 Add to Cart 4x8-3/8" ENSTRON UNDERLAY Item #: 01702515 $29.45 Add to Cart