Corner batten detail
I am building a house with the following wall assembly: conventional 2×6 framing with 5/8 plywood sheathing, 4″ exterior mineral wool, 2×4 untreated DF battens, hardie plank siding and hardie trim. At the outside corners I used 2×8 battens (also unterated DF) so they could be screwed into the corner studs. I am located in a relatively dry part of PNW with an annual rainfall of about 27″. The siding butt joints will be flashed with galvanized plates. I’ve applied two coats of primer on all sides of the corner battens before installing them but I am wondering if some kind of flashing should also be installed to protect them should the caulk between trim and siding fail?
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