Vertical movement

High and low areas

Subfloor flatness measurement

Vertical movement

Vertical movement

Cushion

Vertical movement

Hollow Sound Perception

Vertical Movement / Deflection (Laminate)

Floor Detective® Claims and Conditions Guide

Summary

Vertical movement, also referred to as deflection, occurs when laminate planks move up and down under applied load due to loss of uniform support beneath the floating system. Laminate flooring depends on continuous support to maintain mechanical engagement at joints and distribute load across the assembly. When support condition is inconsistent, planks flex under traffic, increasing stress at locking interfaces and edges. Repeated deflection may contribute to joint fatigue, noise, chipping, gapping, or progressive lock failure. The presence of vertical movement does not independently establish product defect; origin determination requires correlation of

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