Push, pry, nail

That's Frank on the left, Albert in the middle and Kurt on the right -- Albert levering a ceiling board into place, and the other two nailing it tight. One board after that, and that room was finished except for a bit of trim.

Some of the boards are a bit twisted, bowed or otherwise stubborn. It's hard enough to bang them into place as you stack them on a wall, making sure tongue fits into groove along the entire length.

Put the boards overhead, working against gravity as well as wayward wood, and it can be a devilish job.