Dimension a load-bearing beam for a balcony

[lasseplysch]

Hello!
I am starting to feel like building a balcony over part of our patio. Today, there's a small balcony that will be demolished and replaced with a larger one. It will be built in a corner of the house, so there will be two attachment points on the wall. The width is planned to be 5100mm and the depth will be 2700mm. I only want one post in the outer corner of the balcony, so there will be a support beam with a span of 5100mm. Is a laminated beam with dimensions 90x315 sufficient as a support beam, and a laminated post measuring 115x115 in the outer corner?



Sunny greetings, Lars

 

[justusandersson]

90x315 should suffice. I haven't calculated the deflection, but a useful load of 3.5 kN/sqm plus a snow load of 3 kN/sqm is in itself an actual over-dimensioning. The post can be 90x90.

 

[Petros12]

Hi, I have a similar project, a balcony in an inside corner with a post. 4 m span and 3 m depth. I wonder if I could use two 45x220x4000 construction timber for the load-bearing beam? If two 45x220x4000 aren't sufficient, would 56x315x4000 be enough, or what dimensions for a load-bearing beam do you think I should use?

 

[justusandersson]

Double 45x220 is not enough. Glulam 56x315 is insufficient considering the beam is outdoors. I suggest 78x315 instead.

 

[Petros12]

Thanks for the answer, will 66x315x4000 do? That's what I can get around here. Otherwise, it will be something to special order.

 

[justusandersson]

It won't fall down but it's slightly short. If you order it, you can get it in the right length, otherwise, the stock version is usually 6 m long.

 

[Petros12]

Ok, thanks so much. I already bought a 90x315 but find it a bit cumbersome to handle. I can get a 66x315 from a friend, hence my question.

 

[justusandersson]

90x315 is much better. Use it.

 

[Petros12]

90x315 is much better. Use it.

90x315 is much better. Use it.

Thanks for the quick response, I will probably order then. Have a nice evening.

 

[Petros12]

One more question, I'm planning to use studs 3000x195x45 with a spacing of 60cm. I wonder if 195 studs are sufficient, or do I need to go with 220 mm?

 

[justusandersson]

I would use 45x220. 45x195 becomes unnecessarily wobbly with a 3-meter span on a balcony.

 

[Petros12]

Thank you for the answer. Have a nice evening now.

 

[Petros12]

Hello, I have now decided to expand the area of the balcony. I'm wondering what type of outer beam I should use. Please see the picture. Thanks for all the responses.

 

[justusandersson]

I suggest glulam 90x270 for the outer beam. Double 45x220 is not enough.

 

[Petros12]

I was recommended to use 270X90 for my load-bearing beam that carries a lot more than the outermost one will. Thanks anyway for the answer.
Have a great day.