Rubber cork underlayment is great for crack suppression. Polyethylene foam floor underlayment has cushioning properties that are beneficial. 6mm Eco Cork Underlayment Laminate And Tile Floor Underlay Cork Underlayment Underlayment Floor Insulation Rubber generally has higher sound ratings than cork and is more expensive in the same thickness of product. Cork vs rubber underlayment . Rubber Cork can stain vinyl but is great under other wood and tile flooring. Cork will reduce vibration and decrease noise transfer better than any other material except rubber. So you are reusing a natural resource and this may qualify for LEED points on your building project. Rubber cork underlay is an expert at preventing cracks in your tile from your house settling and the natural movement over time. You can think of this underlayment as an invisible bodyguard that keeps your floor looking good even though its out of sight. Unless your flooring came with an attached underlayment you probabl...