A project that I have been putting off for many years suddenly became a bit more urgent over the weekend after my daughter's 20th birthday party. Some pieces of the ceiling had fallen down after they danced in the living room upstairs. The house was built in 1929 and the reinforcement is clearly insufficient. Two beams were added in the 60s but of the wrong type, so they have bent down. I'm considering buying I-beams or HEB might be the right name. The span is about 370 cm, so what dimension should I use? Low ceiling height, so I don't want more than what is necessary. I'm thinking of adding 2 more as well as replacing the middle beam. Would that be sufficient to fix the floor/ceiling?
I should perhaps add that it's not just hanging down, but it sways if you jump on it, hence the loosened plaster.
It is quite common for floors to sag like that in older wooden houses and rarely requires any immediate action. It sags under its own weight but then doesn't lead to much more than that. The plaster falling off is probably mostly due to the movements that occurred. Sure, you can make it straighter, but I think it will be a big project and probably won't add much except for being straight. The plaster today can be scraped clean and then plastered with lime mortar. It's simple and flexible and can be worked on indefinitely since it doesn't harden like cement mortar.
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