USG Fiberock Brand 1/4 in. x 3 ft. x 5 ft. Underlayment 06100246005 - The Home Depot
XPS Underlay Insulation 5mm Premium Wood or Laminate Flooring - Like Fibreboard | eBay
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Project Source 26.33-ft x 3.83-ft x 6-mil Premium Poly Film Flooring Underlayment (100-sq ft / (Roll) in the Flooring Underlayment department at Lowes.com