Mapei Mapeheat 2855915 Floor Heating, Lightweight, Uncoupling, Crack Isolation and Waterproofing Membrane, 7/32" Thick, 161 Sq Ft Roll

Product Features:

• Low-Profile Design: Measures 7/32" (5.5 mm) thick, making it ideal for renovation and remodeling projects where floor height must be kept to a minimum
• Extra Heavy Performance: Rated Extra Heavy under ASTM C627, providing durable load support for demanding residential and commercial tile floor applications
• Heated Floor Ready: Designed for use with in-floor heating cables to create efficient radiant heated floors in bathrooms, kitchens, laundry rooms, and other interior spaces
• Uncoupling Protection: Helps prevent the transmission of in-plane substrate cracks up to 1/8" (3 mm), improving tile and stone installation durability
• Waterproofing Layer: Provides waterproofing and crack-isolation protection to help guard against moisture intrusion in wet and dry areas
• Vapor Management: Suitable for substrates with moisture levels up to 25 lbs. MVER and 100% RH, while helping manage vapor beneath the tile assembly
• Fast Installation: Features minimal roll memory for easier handling, faster layout, and more efficient installation over plywood, concrete, and existing floors
• Tile Underlayment Solution: Serves as an alternative to plywood or cement board as a tile underlayment for ceramic, porcelain, stone, and mosaic tile installations
• Wet Area Compatible: Suitable for showers, laundry rooms, bathtub surrounds, and other spaces where waterproofing and heated floor performance are needed
• Modified Mortar Compatible: Designed for use with polymer-modified thin-set mortars for secure bonding and reliable tile system performance

Product Description:

Mapei Mapeheat Membrane 2855915 is an advanced uncoupling, crack-isolation, waterproofing, and vapor-control underlayment engineered to enhance the performance of radiant heated floor systems. This lightweight polypropylene membrane is specifically designed to accommodate in-floor heating cables, providing a stable and secure channel system that ensures consistent heat distribution while maintaining proper cable spacing. With a thickness of just 7/32" (5.5 mm), it offers a low-profile solution ideal for both new construction and renovation projects where floor height is a concern.

The membrane delivers exceptional structural performance with an Extra Heavy ASTM C627 rating, making it suitable for high-traffic residential and commercial environments. Its uncoupling functionality helps prevent the transfer of in-plane substrate cracks up to 1/8" (3 mm), protecting tile and stone installations from movement-related stress. At the same time, it acts as a waterproofing and vapor-management layer, capable of handling moisture levels up to 25 lb MVER and 100% relative humidity, ensuring long-term durability even in moisture-prone areas.

Mapeheat Membrane is designed for efficient and user-friendly installation. Its minimal roll memory allows it to lay flat quickly, reducing prep time and simplifying handling on the jobsite. Heating cables can be easily embedded within the membrane’s structured surface, allowing immediate application of polymer-modified thin-set mortar for tile installation. This streamlined process improves installation speed while maintaining precision and reliability.

Suitable for a wide range of substrates including plywood, concrete, and existing floors, this membrane eliminates the need for traditional cement board underlayment. It is ideal for use in bathrooms, kitchens, laundry rooms, showers, bathtub surrounds, and other areas where radiant heating and waterproofing are essential. Its versatility also makes it a reliable choice for both professional installers and DIY users.

Compatible with a wide variety of floor coverings such as ceramic tile, porcelain tile, natural stone, marble, granite, mosaic, and vinyl tile, Mapei Mapeheat Membrane delivers a complete solution for modern heated flooring systems. Combining durability, moisture protection, crack isolation, and efficient heat integration, it ensures long-lasting, high-performance flooring installations in both residential and commercial applications.