This 5.25mm thick, hardwearing and commercial grade Sisal underlay provides a luxury feel underfoot. The flat profile, high density crumb rubber underlay gives your carpet incredible support and protection to help reduce carpet wear - helping it to last up to 40% longer. Our Sisal underlay can also be used with underfloor heating! Coverage is 15mÂ² Per Roll. We recommend that the underlay is best bonded with adhesive to the subfloor and the flooring. For this we recommend our Impero All in one adhesive which both tackifies the underlay to the carpet and permanently bonds the underlay to the sub floor.