Hi!
I have screeded a future bathroom on the second floor, but now the tiler has noted that the floor has some give.
Discussed the issue under "Bathroom" but continue here.
The problem is probably the joists, 80x230 c/c 60 with a span of 7-8 meters!
The span is likely too long and needs to be shortened. I have the possibility to do this as we are planning to build an arch between two rooms on the lower floor, which would then be approximately in the middle of the joists.
How do you support the joists from underneath? Do you have to lift the joists a few tenths so it becomes tensioned against the new crossbeam below? How do you do that if so?
I assume it's NOT enough to support against the ceiling and I need to get to the actual joists!?
How strong should the timber be? How do you design the fittings?
Otherwise, we have followed the rules with cross laid c/c 30, 22 mm chipboard, rot-net over the entire floor, minimum 13 mm screed, etc.
I have screeded a future bathroom on the second floor, but now the tiler has noted that the floor has some give.
Discussed the issue under "Bathroom" but continue here.
The problem is probably the joists, 80x230 c/c 60 with a span of 7-8 meters!
The span is likely too long and needs to be shortened. I have the possibility to do this as we are planning to build an arch between two rooms on the lower floor, which would then be approximately in the middle of the joists.
How do you support the joists from underneath? Do you have to lift the joists a few tenths so it becomes tensioned against the new crossbeam below? How do you do that if so?
I assume it's NOT enough to support against the ceiling and I need to get to the actual joists!?
How strong should the timber be? How do you design the fittings?
Otherwise, we have followed the rules with cross laid c/c 30, 22 mm chipboard, rot-net over the entire floor, minimum 13 mm screed, etc.
Horizontally in the ceiling, I suggest a glulam beam, with supports against the joists downwards (vertically) so you can nail together 2-3 pieces of 45 x 95 on each side. You haven't informed how the lower floor's "floor" looks, how large the span will be for a possible glulam beam (which you will probably need to calculate, constructor)
I might be misunderstanding now, but you can't just place the columns on the floor joists below. The load must go down into the foundation somehow for it to be of any use. Beam and column should be placed directly against the floor joists without a ceiling or parquet in between.
How large is the area of the springy floor joists? I can't reconcile the beams being 7-8m but the span of the beam would only be 2m?
How large is the area of the springy floor joists? I can't reconcile the beams being 7-8m but the span of the beam would only be 2m?
The upstairs bathroom measures 3x3 meters and is located in one corner of the house. Under the bathroom floor, the joists span from wall to wall across the house at approximately 7-8 meters. The problem is that on the ground floor, under the bathroom, a load-bearing wall is missing at an opening of about 2 meters (between the kitchen and the living room). Therefore, my idea is to support these 2 meters (with c/c 60, it should be under 3-4 joists) with a strong arch between the kitchen and the living room. This way, the span is effectively halved.
Yes, or maybe measure how much it needs to be raised to correct any sagging that has occurred over time. With some risk that your levelling compound may be damaged.Rottis said:
Prop, jack?
Yep. But even down there, it must go against a "real" foundation.
This is quite a delicate task, all the upstairs forces have to go down through your load-bearing wall and any pillars and then be taken care of in the ground floor joists / slab / beams or whatever constitutes the joists for the ground floor.
Caveat: And even if it happens to be a concrete slab on the ground, it's not entirely certain that you can just place a pillar with load from above without damaging the slab.
pass
Most people are understandably a bit cautious about stating what will (or won't) hold for sure.
But you can check with Moelven's calculation program yourself:
http://www.iat.inadire.se/WebLagerbalk/Lagerbalk.aspx
However, keep in mind that the forces must go down to the foundation!
All load-bearing elements must also be properly aligned (beam directly against joist, etc.) and be correctly fastened!
But you can check with Moelven's calculation program yourself:
http://www.iat.inadire.se/WebLagerbalk/Lagerbalk.aspx
However, keep in mind that the forces must go down to the foundation!
All load-bearing elements must also be properly aligned (beam directly against joist, etc.) and be correctly fastened!
