Reply To: How to know if wooden beams are completely straight? Welcome! › Forums › General Woodworking Discussions › How to know if wooden beams are completely straight? › Reply To: How to know if wooden beams are completely straight? 9 July 2022 at 7:49 pm #766516 deanbeckerParticipant Or just try the string method and observe what the string shows. Sometimes you just have to do something to understand it.