Hello!

I am planning to build a balcony. The problem is that I have a patio door below and a kitchen window below, which means I don't want any supporting posts obstructing the view or the door. So, I thought about using a steel beam, like an HEA.

I will place the balcony on the roof truss on one side and then have a 4-meter span where I have a glulam column supporting the steel beam. On top of the beam, I will place my balcony floor joists.

How strong of a steel beam do I need?

I have tried to draw a small sketch in Paint to illustrate.
 
  • Sketch of a balcony design with a steel beam supported by a glulam pillar, avoiding obstructing doors and windows below, on a residential building.
Iron is quite dull considering rust, maybe both could be glulam?

For balconies, there are probably quite strict building codes, you should probably contact a structural engineer.
 
Hello!

I have a barn constructed with Hea beams for the hayloft structure. Up there, I currently store around 200 tons of timber. I believe my beams are 150 mm. There’s no chance of breaking a Hea beam with a balcony. Over a span of 4 meters, we have three densely packed timber bundles, each 5 meters high. No idea about the weight, but it's many tons. The beam doesn't flex a single mm. So go ahead and build. Then you can build 20 more balconies on top. It'll hold.
 
Cheesus:
I have an H-beam measuring 180x170, which should suffice, considering what you have in your barn.

Mycke-nu:
Rust is obviously not fun, but I can rust-treat, paint, and then encase the iron beam with the same wood I have for the balcony.
 
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