3/4 inch under-layment method plywood subfloor for a parquet floor should be installed with:

For installing a 3/4 inch underlayment method plywood subfloor for a parquet floor, maintaining specific gaps is crucial for proper expansion and contraction due to changes in temperature and humidity. The correct approach involves leaving a 1/8 inch gap between the sheets of plywood. This minimal spacing allows the plywood to move independently without causing buckling or warping, which can occur due to seasonal changes in moisture content.

Additionally, ensuring a 1/2 inch gap along the walls is essential, as it provides enough space for the flooring to expand without pressing against the baseboards or walls, which can lead to unsightly damage or structural issues over time. By adhering to these spacing guidelines, the integrity and longevity of the parquet floor installation can be preserved, making it a crucial aspect of the installation process.