How high should a post or column extending from a beam be above the basement floor slab?

The correct height for a post or column extending from a beam above the basement floor slab is 1 inch. This requirement is based on building codes and industry standards, which mandate a minimum clearance to accommodate for potential moisture or water accumulation that may collect on the floor slab. This clearance helps protect wooden posts or columns from direct contact with the concrete, which can lead to deterioration due to moisture exposure over time.

The other options specify greater heights, which may not be necessary for the intended protection against moisture. While having more clearance could offer additional safeguards, the established standard of 1 inch is adequate, balancing protection with practicality in construction practices.