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The maximum distance that the top edge of wood joists can enter a masonry wall for high-velocity framing is indeed 1 inch. This requirement is crucial for maintaining the structural integrity and performance of the building under high-velocity wind conditions, which are common in certain areas, especially in Florida.

By limiting the penetration of wood joists into the masonry wall to this specific measurement, it helps to prevent moisture penetration and decay of the wood materials, promoting longevity and safety within the structure. The 1-inch guideline is set in accordance with the Florida Building Code to manage the load-bearing capacity and ensure that the wood and masonry are adequately supported without compromising the overall construction standards necessary for high-velocity hurricane zones.

Other distances, such as 2 inches or more, exceed the established limits and could lead to increased risks of structural failure or water intrusion, which the code aims to mitigate through these specific dimensional requirements.