We are soon the owners of a vacation home and have already started the remodeling plans. The intermediate floor in the house is lightly built (45x195, cc600 with a span of 4300 mm), and we need to install a transverse beam to reinforce the flooring. The floor that needs reinforcement is the living room and bedroom.
The ceiling height on the floor below the weak floor that needs support is 2.60 meters. I can support the new beam at one point - see drawing. The beam's placement is fixed (due to the floor plan). The beam will be 7600 mm long.
Now the question is whether we should use a glulam beam, kerto, or steel beam - what is most economical, easiest, cheapest, smartest based on how much the beam extends... etc.?
I'm uncertain about the dimensions, and perhaps someone can help me.
Hmm don't really understand - a beam (bärlina) running lengthwise can't just be supported at one point, then it won't help much!?
You should probably place plinths along the entire length, and if it’s almost 8 meters, you should probably have at least 3-4 plinths, evenly distributed - unless it’s particularly thick and inelastic (steel?) then you might get away with support only at the ends.
I personally have 45x195 with a span of 4.8 meters and a beam in the middle (i.e., 2.4 meters from the outer walls) and don’t experience any sway, but I can imagine that without it, there might be some movement...
The beam in my case is a treated 45x195 placed on 5 plinths
The joists are, as mentioned, 45x195 with a span of 4300. The deflection in the joists makes me want to add a cross beam that can be supported at _three_ points, and the dimensions are somewhat given due to the floor plan.
Since the ceiling height is 260 cm, I can place a beam across the joists to stiffen the structure, without hitting my head on the beam, but I would like to choose a dimension that effectively stiffens the joists.
Note, the image does not show the actual height of the walls - they are illustrated here with 600 mm high walls.
I think that supports quite well, if you can maybe 1-2 more plintar down to the ground would be good, otherwise there will be quite a large span between the middle and the ends.
klaskarlsson, it's an intermediate floor TS is talking about, not a floor on a pillar foundation...
Ah, thanks for the clarification, it was mentioned, but I missed it
Then the support might be more challenging and it could require a coarser beam perhaps...
/K
Steel probably provides the best effect per lost cm in building height!
But it is by far the most expensive and cumbersome to work with from personal experience. It likely requires lifting equipment even if you economize and choose a low beam, like 150mm.
Based on the conditions, I would have chosen Glulam, 90x270 or 90x315 or similar dimensions. And with a jack, tried to slightly over-tension the entire joist.
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