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What is self-leveling concrete?

CTS Cement Manufacturing Corp. says "Rapid Set® LEVELFLOR® is an advanced hydraulic cement-based, polymer-modified self-leveling underlayment that can be used both indoors and outdoors." (read 2026-11-04).

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What this means for your home project

  1. USG says "Floors to be primed must be dry, structurally sound and clean." (read 2026-11-04). (source)
  2. USG says "Primer must be completely dry before application of the self-leveling underlayment." (read 2026-11-04). (source)
  3. CTS Cement Manufacturing Corp. says "Include manufacturer’s instructions for maintenance of installed work, including methods and frequency recommended for maintaining optimum condition under intended use." (read 2026-11-04). (source)
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How thick can self leveling concrete be applied?

CTS Cement Manufacturing Corp. says (read 2026-11-04): “Apply from 1/8” to 2" thick, and up to 5" thick when extended with aggregate.” (source)

How long before I can install flooring over self leveling concrete?

CTS Cement Manufacturing Corp. says (read 2026-11-04): “Moisture sensitive flooring such as epoxy or carpet can usually be placed in as little as 16 hours.” (source)

Does concrete need to be primed before putting down self-leveler?

Sika Corporation says (read 2026-11-04): “Almost all self-leveling underlayments require a primer.” (source) “A primer helps with drying, flowability and bonding.” (source)

Can self leveling concrete be used as a finished floor?

Bostik says (read 2026-11-04): “SL-175™ is also a durable wear layer.” (source) “SL-175™ is for interior use only.” (source) “SL-175™ is self-curing.” (source)

How do I know if my concrete floor is dry enough?

USG says (read 2026-11-04): “Determine underlayment dryness using a Protimeter moisture meter or use the plastic sheet method per ASTM D4263.” (source)

Sources

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