This picture window install has 5/4 Boral flush window trim at the sill rather than a traditional extended sloped sill with drip kerf. What is the preferred method for preventing water from wicking back towards house? I see jobs where the trim is just caulked to the siding but that seems subject to failure.
Somehow cut a drip kerf into existing bottom edge? Metal flashing tucked up under trim boards with turned down drip edge flush with wood edge? Can some caulking be avoided to allow for sill pan drainage?