Mapeguard UM 35 Uncoupling Membrane Underlayment 1/8" 323 SqFt Roll

Key features

• Uncoupling + waterproof: Mapeguard UM 35 controls subfloor cracks up to 1/8 in and adds a waterproof, vapor-managing layer for ceramic tile, porcelain tile and stone floors.
• Extra-heavy duty: HDPE honeycomb with polypropylene backing is ASTM C627 rated for heavy traffic in homes, hotels, spas, galleries and commercial spaces.
• Vapor control: Air-channel design manages up to 25 lb MVER and helps release vapor from green concrete or plywood, helping prevent delamination and cracked grout.
• 323 sq ft roll: Low-profile 1/8 in mat lies flat, holds chalk lines, cuts easily and bonds to polymer-modified thin-set; semi-transparent to confirm coverage.
• Versatile: Supports large-format, granite tile, marble tile, travertine tile, mosaic tile and glass tile, plus heated floors, in bathrooms, kitchens, showers and steam rooms.

Mapei Mapeguard UM 35 is a premium HDPE uncoupling, crack-isolation, waterproofing and vapor-control membrane designed for ceramic tile, porcelain tile, natural stone and large-format tile installations on challenging substrates. This 323 sq ft roll is just 1/8 in (3 mm) thick, keeping floor build-up low while delivering heavy-duty performance. Its honeycomb HDPE structure with a polypropylene backing distributes point loads and isolates substrate movement, controlling cracks up to 1/8 in so they are not transferred to the tile or grout. The membrane is certified to ASTM C627 extra-heavy duty, suiting homes, hotels, hospitals, spas, retail and other commercial spaces. Built-in air channels provide vapor control, managing up to 25 lb MVER and releasing vapor from green concrete or un-cured plywood to help prevent delamination and cracked grout. The semi-transparent surface lets installers confirm full thin-set adhesive coverage beneath stone tile or mosaic tile. Made for efficiency, UM 35 holds chalk lines, lies flat without curling and cuts easily, streamlining installs in kitchens, bathrooms, showers and terraces. It supports heated floor systems, with perforated channels that dis

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