My question to you: Is it wise or misguided of me to install an I-beam that is 150 mm high and 4000 mm long under the 3 laminated beams to make the floor practically rigid? (see explanation below)
The floor in a room on our upper floor shakes annoyingly when you walk on it. The previous owner removed a wall on the first floor and installed a beam made of 3 laminated 45*195 beams instead of the wall. My first thought was that he must have created a gap between the joists and the beam because it shakes so much, but now that I've torn up the floor to install underfloor heating, I notice that the joists actually rest against the beam. It "feels" like 3 pieces of 45*195 which are only 4000 mm long should be rigid for practically any load, but apparently it's not enough at all.
The room is 7200 mm long and 4000 mm wide. The floor joists (50*200 mm) are thus 7200 mm (several of them are spliced in the middle of the room) and the 3 laminated 45*195 beams are 4000 mm. I would prefer to avoid removing the beam, but instead build something suitable underneath it. I still have a high ceiling on the first floor, so it doesn't matter if it's built down a bit more.
The house is old (1932) and very crooked after one of the previous owners cut corners when the basement foundation was being rebuilt in the 70s. It's partly visible in the pictures how much the floor joists have to be built up to make the floor level. There's about a 150 mm difference over 4 meters!
I gladly welcome your wise thoughts and considerations!
The floor in a room on our upper floor shakes annoyingly when you walk on it. The previous owner removed a wall on the first floor and installed a beam made of 3 laminated 45*195 beams instead of the wall. My first thought was that he must have created a gap between the joists and the beam because it shakes so much, but now that I've torn up the floor to install underfloor heating, I notice that the joists actually rest against the beam. It "feels" like 3 pieces of 45*195 which are only 4000 mm long should be rigid for practically any load, but apparently it's not enough at all.
The room is 7200 mm long and 4000 mm wide. The floor joists (50*200 mm) are thus 7200 mm (several of them are spliced in the middle of the room) and the 3 laminated 45*195 beams are 4000 mm. I would prefer to avoid removing the beam, but instead build something suitable underneath it. I still have a high ceiling on the first floor, so it doesn't matter if it's built down a bit more.
The house is old (1932) and very crooked after one of the previous owners cut corners when the basement foundation was being rebuilt in the 70s. It's partly visible in the pictures how much the floor joists have to be built up to make the floor level. There's about a 150 mm difference over 4 meters!
I gladly welcome your wise thoughts and considerations!
Are there any "kortlingar" set in the intermediate floor? Maybe you could start by trying to set beams at the beam, maybe on each side and further away. 7 meters sounds long for an unsupported ceiling with only 190 beams. I'm not surprised that it sways...
Best regards
/Ove
Best regards
/Ove
Thank you for the response!
Since I can get an I-beam with a height of 150 mm for free, I was thinking of placing it under the 3 laminated 45*195 beams. But to further reinforce, I was considering adding 2 more beams where I've laminated 2 45*220 mm joists together. (See attached image). I guess this is stronger than cross-bracing? Am I making a mistake by doing this, or is this a good solution?
Since I can get an I-beam with a height of 150 mm for free, I was thinking of placing it under the 3 laminated 45*195 beams. But to further reinforce, I was considering adding 2 more beams where I've laminated 2 45*220 mm joists together. (See attached image). I guess this is stronger than cross-bracing? Am I making a mistake by doing this, or is this a good solution?
