MAPEI Mapeguard UM 35 Uncoupling, Crack-Isolation, and Waterproofing MembraneMapeguard UM 35 uncoupling and waterproofing membrane Mapeguard UM 35 is a high density polyethylene (HDPE) uncoupling membrane with a polypropylene fabric backing designed for installing ceramic and stone tile. It provides crack isolation, waterproofing, and vapor management over challenging substrates like young concrete and single layer plywood subfloors. Key Features: Multi Function Protection: Uncoupling, crack isolation up to 1 8 in (3 mm),

Mapeguard UM 35 uncoupling and waterproofing membrane

Mapeguard UM 35 is a high-density polyethylene (HDPE) uncoupling membrane with a polypropylene fabric backing designed for installing ceramic and stone tile. It provides crack isolation, waterproofing, and vapor management over challenging substrates like young concrete and single-layer plywood subfloors.

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Key Features:

• Multi-Function Protection: Uncoupling, crack isolation up to 1/8 in (3 mm), waterproofing, and vapor management up to 25 lbs MVER and 100% RH
• Durable Construction: HDPE sheet with polypropylene fabric backing delivers excellent mechanical and compression strength
• Low-Profile Design: Just 1/8 in (3 mm) thickness to minimize floor height buildup
• Installer-Friendly: Circular cavities allow easy troweling; lightweight and holds a chalk line
• Versatile Substrate Compatibility: Suitable over concrete, young concrete, existing non-cushioned resilient flooring, ceramic and stone tile, and single-layer 3/4 in plywood (joists up to 19.2 in OC)

Please check the Product Data Sheet Here

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Specifications Table:

Specification	Details
Material	High-density polyethylene (HDPE) with polypropylene fabric backing
Functions	Uncoupling, crack isolation, waterproofing, vapor management
Crack isolation rating	Up to 1/8 in (3 mm)
Thickness	Approx. 1/8 in (3 mm)
Vapor management	Up to 25 lbs MVER (11.3 kg) and 100% RH
Mechanical properties	Excellent mechanical and compression strength
Weight/Handling	Lightweight; holds a chalk line
Substrate compatibility	Concrete, young concrete, existing non-cushioned resilient flooring, ceramic and stone tile, single-layer 3/4 in (19 mm) plywood with joists up to 19.2 in (49 cm) OC

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Frequently Asked Questions (FAQ):

Q: What substrates can Mapeguard UM 35 be installed over?
A: It can be installed over concrete (including young concrete), single-layer 3/4 in plywood subfloors with joists up to 19.2 in on center, and existing non-cushioned resilient, ceramic, or stone tile.

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Q: How much crack isolation does it provide?
A: It helps protect tile installations by bridging in-plane substrate cracks up to 1/8 in (3 mm).

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Q: Is Mapeguard UM 35 waterproof?
A: Yes. When seams and penetrations are properly treated, the membrane provides waterproofing for wet-area installations.

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Q: What is the thickness of the membrane?
A: The membrane has a low profile at approximately 1/8 in (3 mm) thickness.

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Q: Does it help manage moisture vapor?
A: Yes, it manages vapor pressure up to 25 lbs MVER and 100% relative humidity.

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Elevate Tile Installations with Sculpted, Seamless Confidence

This membrane creates a refined foundation, quietly delivering strength beneath stone and porcelain. I love the subtle, circular texture—an architectural detail that whispers performance while keeping profiles slim. Pair it with expansive marble-look tiles to achieve a gallery-worthy floor that feels effortless. It’s a discreet essential for luxurious living where durability meets design.

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Choose Mapeguard UM 35 today to ensure your next tile project is flatter, drier, and built to last.