gathers is what I’m most concerned about, so water (in the form of liq- uid or vapor that condenses and becomes liquid) has an exit. I also wrapped the bottom plate to shed descending and ascending water (yes, it can flow uphill). I then created a "drainage plane"—an air gap behind the wall cladding through which water can travel and escape. I’d love to say I’m a genius for using the dimpled material that created this gap (dam proofing membrane, DPM), but the truth is I stumbled upon it. I had a roll left from installing my basement's perimeter drain. It’s inexpensive and easy to apply. I held it in place with washer-head Spax screws. Once in, I marked the horizontal blocking with a Sharpie so I could locate it for nailing.
A weatherboard sloping towards the drain was installed above the curb to divert water away from the end-grain of the wood shower cladding. Shoot 2-1/2" nails care- fully through the weatherboard to hold it fast.
Corner blocks made of 4/5 boards were installed to begin installation of the wood panels. Get the corner boards as plumb as possible to avoid taper cuts on your wall boards.