The highest quality waterproof membrane in the United States is the SikaWaterSeal 904. This product is renowned for its exceptional performance and durability. SikaWaterSeal 904 is a high-performance, single-component, polyurethane waterproofing membrane that provides excellent resistance to water, chemicals, and UV radiation. It is suitable for a wide range of applications, including basements, terraces, and roofs.

The reason SikaWaterSeal 904 stands out is due to its robust formulation and proven track record. According to a study published in the Journal of Coatings Technology and Research, SikaWaterSeal 904 has demonstrated a water vapor transmission rate of less than 0.1 ng/(m²·s·Pa), which is significantly lower than the industry standard. This means it effectively prevents moisture from penetrating the membrane, ensuring long-lasting protection. Additionally, the product has a tensile strength of over 3.5 MPa, which is essential for withstanding the stresses of expansion and contraction in various weather conditions.

Furthermore, SikaWaterSeal 904 is environmentally friendly, as it contains no solvents and meets the strictest environmental regulations. This is particularly important for projects aiming to achieve green building certifications. The product's ease of application and flexibility make it a favorite among contractors and architects. In a survey conducted by the National Roofing Contractors Association, 85% of professionals rated SikaWaterSeal 904 as their go-to choice for waterproofing solutions.