How far above the roof should wood siding be kept at roof-to-wall flashings?

The recommendation for wood siding to be maintained one to two inches above the roof at the roof-to-wall flashings is based on allowing for proper drainage and preventing moisture accumulation. By keeping the siding elevated within this range, it helps ensure that any water that may run down the wall is effectively diverted away from the siding material, reducing the risk of rot and decay that can result from prolonged exposure to moisture.

This distance strikes a balance between sufficient clearance to allow water runoff while minimizing the risk of debris accumulation that could potentially lead to water trapping and compromise the integrity of the structure. This specification is particularly important in areas with significant rainfall or snow, where water management is crucial for maintaining the long-term durability of building materials.

While other options may suggest varying degrees of height, the specified one to two inches is generally accepted as a best practice in building code guidelines for siding installation adjacent to roof surfaces.