Bunny asked if I could shiplap the small space behind the mirror in the master bath. Sounds easy enough.
I used 1/8" underlayment plywood cut to 6" widths.
Here is what it looked like before I started.
I marked the studs so I could keep things straight.
Here it is painted and the light installed.
I used pennies to space everything. If I do it again. I will make the gaps a little wider.
Wow. I just noticed the gaps between the vanity and wall on each side. Looks like I need to get back in there and caulk. I will get that cleaned up.