Ship Lap Sidingis a type of Drop Lap siding with a tight "flush joint" profile. The boards form a tight join when installed. It is similar to tongue and groove but with a single over lapping edge - usually 1/2" in depth but can me more or less depending on the width of the board...
it was almost impossible to go back with a tiny paintbrush and paint the wall in between the planks, but at some angles you could see the wall so you could see how shallow our faux shiplap boards actually were. So