Just enough maintenance and no more! Excessive moisture, introduced by wet mopping and an overzealous maintenance schedule can not only cause damage to floor finishes but can cause wood, bamboo, laminate and other wood composite flooring products to expand excessively. Wet mopping and steam cleaning for example are NOT recommended. Occasional damp and regular dry mopping are. If/when the flooring grows and binds on a vertical obstruction it will then buckle and possibly lift. This can result in up-down movement of the flooring system called deflection (soft spots) as seen in this clip. Non flat (wavy sub-floor surfaces) can also cause deflection issues but for very different reasons. Good quality products provide clear maintenance (and related warranty) instructions that should be left with the client after the flooring is installed. Lack of knowledge and understanding regarding maintenance is a major cause of product failure and client dissatisfaction... unnecessary! This easily ignored and yet simple after sales service should be a must in our industry.