Hello everyone. I am going to build a balcony between two pillars that are under a roof. Distance between the wall and pillar: 2200mm and distance between pillars: 5100mm.
I have planned to have the load-bearing beam between the pillars. For floor joists, I plan to use C24 45x120 cc400 and glulam beam as the load-bearing beam. Now to the question:
According to the design program, the load-bearing beam needs to be 90x315, which seems very large to me (I had in mind 56x225). I had intended to have the load-bearing beam on the outside of the pillars but don't want it to protrude 90mm from them, it will look odd to me. Could I place the load-bearing beam in joist hangers between the pillars and then enclose a frame around the balcony? What is the smallest dimension I dare to go down to for the load-bearing beam?
Sorry for the poor grammar and I hope you understand what I mean. I'm a bit tired after 2 years of new construction and inspection the day after tomorrow (however, the balcony doesn't need to be finished by then, fortunately).
//Jonas
I have planned to have the load-bearing beam between the pillars. For floor joists, I plan to use C24 45x120 cc400 and glulam beam as the load-bearing beam. Now to the question:
According to the design program, the load-bearing beam needs to be 90x315, which seems very large to me (I had in mind 56x225). I had intended to have the load-bearing beam on the outside of the pillars but don't want it to protrude 90mm from them, it will look odd to me. Could I place the load-bearing beam in joist hangers between the pillars and then enclose a frame around the balcony? What is the smallest dimension I dare to go down to for the load-bearing beam?
Sorry for the poor grammar and I hope you understand what I mean. I'm a bit tired after 2 years of new construction and inspection the day after tomorrow (however, the balcony doesn't need to be finished by then, fortunately).
//Jonas
Can't you place the support beam on top of the posts? We have exactly the same balcony construction but with 3400 between the posts and were planning to use 315x66. I agree with you that it's not aesthetically pleasing to attach something wider than 66 mm outside the posts.
Can't you have more posts then?
Have you really entered everything correctly in the calculation program? You are aware that you should account for a useful load of 3.5 kN/m2 on balconies, I also think that 315x90 sounds a bit weak. When I input your figures into my calculation program, I get that you need at least 360x90 glulam (Deflection: L/315 utilization rate: 60%) beams 145x45 cc400 (deflection: l/303 utilization rate 58%), this for snow zone 1...
PS: Have you designed everything yourself?
I'm not an engineer and don't want to create the impression that you must have one... just generally curious.
Can't you have more posts then?
Have you really entered everything correctly in the calculation program? You are aware that you should account for a useful load of 3.5 kN/m2 on balconies, I also think that 315x90 sounds a bit weak. When I input your figures into my calculation program, I get that you need at least 360x90 glulam (Deflection: L/315 utilization rate: 60%) beams 145x45 cc400 (deflection: l/303 utilization rate 58%), this for snow zone 1...
PS: Have you designed everything yourself?
I'm not an engineer and don't want to create the impression that you must have one... just generally curious.
The posts go all the way up to the ceiling and I would rather not have more posts underneath if it can be avoided. Since the balcony will be under a roof, there will be no snow on it. According to the Moelven calculation program indoors, one can manage with 56x270. Maybe then one can make a support in the posts (the posts are 160x160)?
P.S Yes, I have designed everything myself.
P.S Yes, I have designed everything myself.
I actually don't know whether to account for snow load on the balcony; it seems reasonable to assume that you won't have full capacity (350 kg/m2) at the same time as several decimeters of snow on the balcony...
Anyway, you should add two more posts between the others to fix the problem. If you place the posts 1400-2300-1400, you'll manage with the intended beam, and you can even choose a slenderer one! 120x45 (C30 -> L/290 utilization rate: 55%) I can't get approved even if I set the self-weight to 0 and disregard any snow load.
Edit: Didn't get to see your response. Maybe one post can solve it?
You can absolutely create a support in/on the posts!
Anyway, you should add two more posts between the others to fix the problem. If you place the posts 1400-2300-1400, you'll manage with the intended beam, and you can even choose a slenderer one! 120x45 (C30 -> L/290 utilization rate: 55%) I can't get approved even if I set the self-weight to 0 and disregard any snow load.
Edit: Didn't get to see your response. Maybe one post can solve it?
You can absolutely create a support in/on the posts!
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According to the table, 120x45 can handle a span of 1.9 m with cc60, with cc40 10% more, so roughly 2.1m. Suggestion: I create a support in the posts and use 56x270, which would work indoors. Then I only clad the sides of the balcony.
Do you think 120x45 is too weak?
Do you think 120x45 is too weak?
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