During the building process, no matter how meticulously you select your lumber, it will never be perfectly straight. It is something that first time builders don’t consider, that your materials will be imperfect, which can result in your house being off.
The longer the board, the less straight it will be.
Another common first time builder assumption that is incorrect is lumber dimensions. To add to the confusion lumber is milled smaller than their names might indicate. A 2×4 isn’t actually 2″ by 4″, it is actually 1.5″ by 3.5″ and this is the case for all milled lumber.
What I hadn’t realized when I started is that lumber isn’t all milled the same. For example I picked up some 2×4′s that were the higher grade studs to find that they were in fact 1/8″ smaller in each dimension. Also 8 foot boards are often longer than eight feet. When it comes to ply wood, usually the thickness is the same thickness indicated, but the 4′ by 8′ panel isn’t always 4 feet by 8 feet. Plywood is also seldom flat, it often has a bow to it, I found digging into the stack of plywood and pulling out the middle sheets of the pile are often flatter. Also the thicker the board, the flatter it stays.
So today I wanted to share these video on how to handle warped and twisted boards.