What is the minimum gap allowed between sill and sill?

The minimum gap allowed between sills—particularly in building or construction contexts—plays a crucial role in preventing moisture buildup and ensuring proper drainage. A gap of 1/2 inch is generally accepted as the minimum standard because it provides adequate space for air circulation, allowing any moisture that does accumulate to evaporate. This helps mitigate issues such as mold growth or wood rot that can arise from water retention.

In fields like carpentry and construction, adhering to these guidelines ensures that structures remain durable and maintain their integrity over time. If the gap is too small, it can lead to trapping moisture, while a gap larger than necessary may not be structurally sound and could lead to weak connections between sills or other components. The chosen standard of 1/2 inch strikes a balance between functionality and structural support.