Hello,

I have become a frequent user of the forum and have greatly benefited from all the threads available during the ongoing house construction!

Now that the interior is starting to be finished, I've started to think about how the construction of the balcony will look.

I have a split-level house where the kitchen/living room is on the upper floor, and a balcony is planned to run along the entire long side of the house (16.3m), which is already approved in the building permit.

The balcony will mostly extend 3.5m from the house wall and be 9.6m wide (the remaining part will be a walkway from the master bedroom to the large balcony).

Now to my question, how should this be dimensioned correctly? I want there to be only posts at the front with recessed framework so as not to block too much on the lower floor.

My thought is that there should be about 2.4m between the posts, which will be made of glued laminated timber pillars and a beam of glued laminated timber 66x315. The floor joists will then be 220x45 (cc300 or cc450) pressure-treated wood. Decking 34x145 on top of everything. The posts will be cast in plinths, which will also be cast to create the patio under the balcony.

Is it okay to mix pressure-treated and glued laminated timber in this way? Have I understood correctly when reading various dimensioning guides? Or have I over/underdimensioned?

The railing will be a glass railing without posts, so there will also be some weight there. The walkway will be built to the same dimensions as the large part for aesthetic reasons.

Please give your input, and the plan is to start a construction thread when it's time.

Here's a picture of how it looks right now. @villasegerlund on Instagram for those interested.
 
  • A house under construction with an excavator digging in front, preparing the ground for a balcony extension; a person in winter clothing nearby.
S
Why such a high glue-laminated beam as a load-bearing beam if you are going to have recessed floor beams (which are probably fastened with joist hangers?), and what dimensions have you planned for the columns?
 
From what I've read, glulam is required since I want a larger distance between the columns. That's why I'm asking here if I've thought correctly both when I checked with the sizing guide and similar tables. I prefer to over-dimension a bit to get a more stable (I think?) structure.

The columns are made either of 90x90 glulam or 115x115 glulam, both work well, aesthetics will decide.
 
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