Concrete surface peeling from slab

Dusty adhesive under Laminate flooring plank

Hand wiping dusty concrete slab

Laitance, Dusting, and Weak Surface Layer (Concrete / Substrates)

Floor Detective® Claims and Conditions Guide

Summary

Laitance, dusting, and weak surface layer conditions describe reduced surface strength at the top of a concrete slab that may affect flooring adhesion and bond performance. These conditions develop when a thin, low-strength layer forms at the surface due to finishing practices, excess water, or curing variability. While the slab may remain structurally sound, the weakened surface may prevent proper adhesive bonding or mechanical interlock. The condition reflects surface integrity and preparation rather than a defect in the flooring material. See also Concrete Surface Profile and Surface Preparation, Concrete Surface Contamination, and Concrete Substrate Problems.

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