How's it going Justus? Are you getting anywhere?
Best answer
If one can assume that the beam does not need to handle any roof loads (which I don't know) but only floor loads from the attic floor and roof loads from the veranda, then a 4 m long glulam beam should have the dimension 90x450. 190x360 has the same capacity. I have calculated with a distributed load of 19.75 kN/m. Personally, I would first conduct a proper measurement.
I don't have the space under the veranda beams, only about 15cm. Or can you bolt the beams on the side of the glulam beam?
You can use some form of heavy forging fitting, a type of enlarged joist hanger. Go to a blacksmith or a mechanical workshop.
Great! And how much worse is a homemade beam, e.g., 8x45x195?
What does 8 stand for?
8 pieces to get 195x360
I am not an expert in manufacturing laminated wood, but if you use C 24 timber and a suitable type of glue and can apply proper pressure, the difference should not be that significant. However, it requires quite a few clamps/glueknektar.
Screw glue? Or will it be worse?
I don't think screw gluing is an option when you have so many lamellas. If you use dimension planed wood, you should edge saw the boards first so you don't get any round corners in the construction.
Are those too weak? https://www.jula.se/catalog/bygg-och-farg/beslag/byggbeslag/vinkel-skarvjarn/vinkeljarn-340037/J justusandersson said:
Yes. I don't think the ones you need are available ready-made.
How powerful do I need them to be then?
Go to a mechanical workshop and present the problem. Show pictures of your porch beams and say that you want enlarged beam shoes that should withstand at least 15 kilonewtons (about 1500 kg).
How closely should the jigs be placed?J justusandersson said: