Where do deck boards often begin to rot first?

Rot in deck boards typically begins where the joists penetrate the wall due to a combination of factors that create an environment conducive to moisture retention and decay. This area is particularly vulnerable because it is often exposed to water accumulation from rain, snow, and humidity, which can seep into the ends of the boards. Additionally, if there are any flaws in the flashing or waterproofing around the wall, it can exacerbate water exposure at this junction.

In contrast, while edges, the middle of boards, and areas near railings can also experience rot, these sections are generally less susceptible initially compared to where the joists meet the wall. The immediate proximity of joists to the structure and potential for trapped moisture makes this point the most critical for decay to initiate. Understanding where rot commonly begins helps in conducting thorough inspections and maintenance to prolong the life of a deck.