Product Description Improve the air quality in your home with QEP's Natural Cork Underlayment. This cork underlayment protects your floor against stress cracks transferring from the subfloor to flooring surfaces, and reduces thermal transmission, boosting the effectiveness of floor heating systems. It also reduces sound transmission and makes an excellent sound barrier for all flooring types. It has an R-Value of 0.74, Delta sound rating of 22, and 74 IIC & 70 STC when installed under ceramic tile on a 6 in. cement slab. QEP Natural Cork Underlayment Roll is FloorScore Certified for healthier indoor air quality and may contribute towards credits under the LEED Green Building Program. Install it like a professional using ROBERTS 7250 Cork Underlayment Adhesive and ROBERTS 50-040 Underlayment Tape Roll. From the Manufacturer Improve the air quality in your home with QEP's Natural Cork Underlayment. This environmentally-friendly cork underlayment is naturally hypoallergenic and contributes to a healthier indoor air quality. It also reduces sound transmission and makes an excellent sound barrier for all flooring types. This cork underlayment protects your floor against stress cracks transferring from the subfloor to flooring surfaces, and reduces thermal transmission, making it ideal for radiant flooring. Install it like a professional by using Roberts Cork Adhesive and Roberts Seam Tape. It has an R-Value of 0.74, Delta sound rating of 22, and 74 IIC & 70 STC when installed under ceramic tile on a 6 in. cement slab with suspended ceiling. QEP Natural Cork may contribute towards satisfying credits under the LEED Green Building Program.