What Causes Laminate Floor Peaking?

This is the primary cause. Laminate flooring expands with heat and humidity. Manufacturers require expansion gaps at all fixed perimeters — walls, door frames, cabinets, and transitions. When these gaps are too small or absent, the expanding floor has nowhere to go and forces planks upward at joints.

While modern laminate has improved water resistance, moisture absorption — particularly from subfloor sources, plumbing leaks, or excessive cleaning — causes the core board to swell. The swelling creates lateral pressure that results in peaking.

Laminate installed over high spots or ridges in the subfloor is forced into a peaked or tented configuration. The floor rests on the high point and gaps at the surrounding area.

Failure to install or properly size transition strips at room divides, doorways, or changes in flooring material creates fixed obstruction points. As the floor expands, it pushes against these points and peaks.

Running laminate through multiple rooms and hallways without expansion breaks concentrates expansion stress into a small area, eventually causing peaking or buckling.