Excessive fastener spacing

Destructive testing

Destructive testing

Lack of Adhesive

Lack of adhesive

Lack of Adhesive

Hollow noise area

Flatness issues

Flatness issues

Hollow Sounds (Hardwood Flooring)

Floor Detective® Claims and Conditions Guide

Summary

Hollow sounds in hardwood flooring are audible tonal differences noticed when walking across the floor or applying load. The condition reflects sound response within the flooring and subfloor system rather than visible surface damage. Hollow sound may occur with or without measurable vertical movement and may be influenced by installation method, substrate flatness, adhesive distribution, fastener engagement, or environmental conditions. In the absence of measurable vertical movement or separation, hollow sound alone does not

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