Parquet is a natural material, wood can react sensitively to strong temperature fluctuations. You can prevent this by not processing parquet immediately after purchase and transport. The material must be acclimatised to room temperature before laying. Store the planks (in their packaging) in the room where they will later be laid. The storage period is at least 48 hours. The surface should be even.
Important so that the properties of the parquet are not affected: The room temperature should be between 17 and 25 degrees Celsius at most. If the room has floor heating, the temperature of the floor heating must be at least 15 degrees and at most 20 degrees. Ideal is an air humidity in the range of 50 to 65 percent. After installation, the parquet is much less sensitive. Correct storage prevents the elements from warping or swelling before installation. If the parquet is stored for a longer period of time, room temperature and humidity must be checked regularly.