I am building a room where a new ceiling will be installed. The dimensions of the beams that will support the ceiling (three layers of plasterboard) will be 8.8m. I have tested splicing 140*45 beams that overlap with a one-meter splice. I have screwed these with cc30. I figured if I can stand on it (100kg), it should hold the plasterboard, right? If I have calculated correctly, the weight for three layers of plasterboard will be about 24kg/m2, which shouldn't be a problem. I haven't glued the test beam, so it sags about 2cm in the middle when I stand on it, but I think wood glue should fix that.
What do you think about that, and do you have any other tips?
I would have gone with 6"x2" joists or at least 5"x2". The strength increases with the y-dimension to the third power.
Screw with cc 30 on a meter length is not particularly many screws. Compare for example nail plates.
It's one thing to be able to walk on it, another to have a margin and be prepared for the worst.
I think that will flex. Assuming cc60 between the joists, you are loading each joist with about 230kg. Gluing them together in width doesn't increase the bending resistance; it can reduce the risk of them twisting when you stand on them.
Is there no possibility to hang it from something above?
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