Cantilevered exterior wall rainscreen detail
I’ve got a cantilevered exterior wall with a rainscreen and am wondering about how to finish the bottom of the wall. I’ll have the typical 3/4″ ventilated strip between the wood siding and sheathing, but I’m wondering whether I need flashing to run along the bottom of the wall as well?
I worry that without this flashing water that gets behind the rain screen will drip down and end up soaking into the bottom of the OSB sheathing, eventually rotting it out. As the same time I wonder whether this is overkill as the cantilever will have extensive ventilation for this OSB and perhaps simply extending the WRB down a 1/4″ or so would allow any water to drip off without being sucked up by the OSB.
I’ve attached a sketch of what I’m planning to do (leaving out the ventilation strip as it was getting cluttered in the sketch) and was wondering what people thought – is it overkill or a good idea?
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