12 x 18 paper is special. So special in fact, that one kind of person can’t live without it. Bet you $10 you can’t guess who needs it. Give up? Architects love 12 x 18 paper! (We know you read ahead, the bet’s off!) Also known as Arch B paper, 12 x 18 may seem like a kooky kind of size to use, but that’s for a good reason. All North American Architecture paper can be folded in half, hamburger style (short side to short side) to produce a sheet of paper equivalent to next size down, Arch A sized paper in this case. Pretty neat, right? Multifaceted and multifunctional, Arch B 12 x 18 paper is ideal for any architect worth their salt. Why think twice about what you’re going to draw on when it’s plain to see that there’s only one kind of paper for you.