Hydraulic Cement Underlayment (ZD)


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8.5" x 11"
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Hydraulic Cement Underlayment

Use this section to specify hydraulic cement underlayment, a poured-in-place, self-leveling Portland cement-based floor underlayment.

What is a hydraulic cement underlayment?

Hydraulic cement underlayment is a type of building material used primarily in flooring applications. It’s a specialty product designed to create a smooth, level surface on floors.  To allow the installation of final floor coverings like tile, carpet, or wood. Here are some key characteristics and uses of hydraulic cement underlayment:

  • Composition: Made from a mixture of Portland cement, fine aggregates, and other additives that enhance its properties. The “hydraulic” aspect refers to the cement’s ability to set and harden through a chemical reaction with water, which occurs even under water.
  • Self-Leveling Properties: Are self-leveling, meaning they spread out evenly on their own when poured, creating a flat, level surface without the need for extensive manual smoothing. This is particularly useful in situations where the base floor is uneven or has minor imperfections.
  • Application: It is applied over a structural subfloor, such as concrete or plywood. It’s important to note that hydraulic cement underlayment is not a structural material itself but rather a preparatory layer that provides a smooth, level base for the final floor covering.
  • Rapid Setting and High Strength: These underlayments typically set quickly and, once cured, provide a durable and strong surface. This makes them ideal for environments that will experience regular or heavy foot traffic.
  • Moisture Resistance: The material is generally resistant to moisture, which makes it suitable for use in areas where moisture might be present, like bathrooms or basements.
  • Versatility: Depending on the specific product and application, hydraulic cement underlayment can be left exposed, polished, or treated (such as dyed or stained) for various aesthetic effects.
  • Use in Renovations and New Constructions: It’s commonly used in both new construction and renovation projects to correct uneven floors, prepare for new flooring, or update an existing surface.
  • Professional Installation Recommended: While some DIY enthusiasts might tackle installation, professional installation is often recommended to ensure proper mixing, application, and curing.

Key Features:

  • Self-Leveling and Trowellable: Available in both self-leveling and trowellable formats, catering to different application needs and preferences.
  • Versatility: Suitable for application over concrete or plywood structural floors.
  • Interior Use: Optimized for indoor environments, ensuring longevity and durability where it counts.
  • Customizable Finishes: Depending on your selection, the underlayment can be left exposed, polished, or dyed/stained for a unique aesthetic.

Applications and Suitability

Hydraulic Cement Underlayment is not a structural component, but a preparatory layer that enhances the quality and stability of your finished flooring. It is not intended for exterior use but excels in various interior settings such as homes, offices, retail spaces, and more.

Please Note:

  • Not for Structural Support: It is essential to apply it over a robust concrete or plywood structural floor.
  • Follow-Up Flooring: Typically, it is covered with finished flooring materials like tiles, hardwood, or carpet.

Customization and Consultation

Every project is unique, and so are your underlayment needs. We recommend consulting with an underlayment manufacturer to select a product that aligns perfectly with your project requirements.

Learn More

Self-leveling concrete, visit Wikipedia.

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Hydraulic Cement Underlayment

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