Pro’s Choice Super Subfloor Underlayment Panel has a Limited Lifetime Warranty. Global Product Sourcing guarantees against "yellowing" and delamination of the panel. Our subfloor panel has a smooth face with "x" nail/screw markings every 4" x 4". It has a solid core with no voids or core laps. Constructed from selected hardwood with a combi-core for stability, our underlayment panel meets or exceeds HUD emission requirements.