Surface phenomenon: Part of the wooden floor board arches upward, or a few pieces of wooden floor arch up.

Cause Analysis:
1, continuous rainy weather, the relative humidity in the air is too high, did not take measures to remove moisture, moisture in the air absorbed by the wood floor absorb moisture expansion;
2. The wooden floor absorbs moisture and swells after being immersed in water;
3, long-term empty houses, no one lived, poor ventilation, the middle layer of water in the paint layer evaporated, nowhere to be absorbed by the wood floor absorb moisture expansion;
4. The moisture content of grass-roots concrete is too high, and the damp-proof insulation layer is not sealed and absorbs moisture;
5. When the hardwood floor is paved, the joint between the adjacent plates is not reserved as required, and the wetted air absorbs the moisture and expands and arches, and even the paint is squeezed.
6. The paving area of ​​wooden floor is larger or wider, and no sectional measures have been taken.

Preventive measures: often open the window for ventilation; and in accordance with the provisions of the reserved structure expansion joints, section joints and adjust the reserved joints between adjacent plates.

Solution: When the function is not affected, wait for a longer period of time. After the moisture content of the wooden floor is balanced with the relative humidity in the air, the demolition and re-paving plan is taken depending on the situation; or all the re-openings and adjustments are made. Seams and adjacent plates are reserved for joints.