Column load

[bellman83]

It's not a good solution with 8 m long floor joists. You'll need to rethink that. Either an additional beam at halfway across or a strong glulam beam (with at least 3 column supports) along the mezzanine edge and the floor joists in the other direction.

It's not a good solution with 8 m long floor joists. You'll need to rethink that. Either an additional beam at halfway across or a strong glulam beam (with at least 3 column supports) along the mezzanine edge and the floor joists in the other direction.

I'm open to suggestions, however, I've got from the calculation program that the deflection of the beams is about 7 mm with the right beams at 8 meters.

Is there any specific reason why it's bad, besides the fact that the other way would have been more traditional?

With them in this long direction, the total ceiling height is higher.

 

[justusandersson]

The beams will have quite coarse dimensions. To achieve a deflection of 7 mm, for example, glulam beams 90x540 at c/c 600 mm are required. This costs nearly 30,000 SEK. A glulam beam as the conclusion of a mezzanine can be positioned so that it also becomes part of the railing.

 

[bellman83]

It leads to very large dimensions on the beams. To achieve a deflection of 7 mm, for example, it requires glulam beams 90x540 on c/c 600 mm. That costs nearly 30,000 SEK. A glulam beam to finish off a mezzanine can be placed so that it is also part of the railing.

Apparently, Moelven calls it "deflection control" when choosing a floor beam. For CC 600 and a 90*360 beam, the deflection control is 1.2 mm.

According to my information, the beams would cost 19,000 SEK.

That idea of using glulam as part of the railing was smart, but I plan to have a spiral staircase up to the loft, and it would be awkward to step over that edge.

 

[justusandersson]

Deflection control is actually the most basic test. But for 1.2 mm, the span cannot be as large as 8 meters. 19000 is indeed a bargain price today, but I'm not sure if it's wise to base it on that. You should place the spiral staircase inside the beam. It will be a more attractive solution since you are exposing the glulam beam.

 

[bellman83]

Apparently, moelven calls it "deflection control" when choosing floor beams. For CC 600 and 90*360 beams, the deflection control is 1.2 mm.

The beams would cost 19000 according to my information.

With

Deflection control is actually the most basic test. But for 1.2 mm, the span cannot be as large as 8 meters. 19000 is admittedly a bargain price today, but I don't know if it's wise to rely on it. You should place the spiral staircase inside the beam. It becomes a nicer solution as you expose the glue-laminated beam.

Deflection control is actually the most basic test. But for 1.2 mm, the span cannot be as large as 8 meters. 19000 is admittedly a bargain price today, but I don't know if it's wise to rely on it. You should place the spiral staircase inside the beam. It becomes a nicer solution as you expose the glue-laminated beam.

The information for the deflection control comes from moelven, so I can neither confirm nor deny it.

Did you mean the staircase in a hole up through the joist then?

 

[justusandersson]

Yes.