Hello to the great woodworking community!
I'd be grateful for a bit of advice concerning the building out of the following construction:
I bought the glued dried pine wood already. I will use screws because I want to be able to disassemble it easily on demand. I also want to achieve that cross connections are aligned as a straight plane on the top, as shown on the image, so I have no gaps for the top board. That means I need to cut out the beams one into another to achieve it.
The question is, for the marked joint in the middle of the 2.5m (100") beam, what is the optimal depth that I can cut out the lap-joint on each of the beams in order not to weaken too much neither the top or the bottom beam. Should I cut into the middle of the top beam, or go even more, not to weaken the bottom 2.5 (100") beam which needs all the strength? On top will be a loft bed 160cm wide with not more than total 200-300kg of weight. Here are the two examples, which one would be more appropriate?
Thank you so much!