Final answer:
Building codes require a specific spacing for balusters on detached decks over 30 inches off the ground.
Step-by-step explanation:
The subject of this question is building codes, specifically related to decks. The spacing requirement for balusters of a detached deck over 30 inches off the ground is that there should be no more than 4 inches between them. This requirement is in place to ensure the safety of individuals using the deck, preventing accidents or falls.