45mil Thick Membrane Roll: Our roofing membrane features a 45mil thickness for superior waterproof performance and extended durability, securing your roof from rain damage for the long term Easy Roof Coverage: Measuring 30 x 40 ft / 9.144 x 12.192 m, this roll roofing easily covers various roof sizes to suit your needs Waterproof & Aging-resistant: Made with high-quality EPDM rubber, the roof underlayment offers excellent waterproofing, is aging-resistant, and insulates, ensuring no deformation or aging even under the sun Easy DIY Installation: The rubber roofing roll is easy to cut, so you can adjust it to your roof size and install it yourself, saving you time and money Adapts to All Roofs: The flexible EPDM roofing membrane fits a variety of roof shapes, whether flat or curved, ensuring a great seal for optimal waterproofing