The plan is to install 2 sliding door sections in the exterior wall to open up the view. One section will be 3.7m in length and the other section will be 3.2m, plus an additional patio door beside it at 0.9m, so I assume it should be included. The sliding doors are intended to be 2.3m high. Between the patio door and the sliding door, there will be extra support, partly to connect the sunroom to the wall and partly to attach the frame for both the patio door and sliding door. I want the beam height to be as low as possible, and I was considering a steel beam instead of glulam. What dimensions might be necessary?
Additional info;
The roof trusses seem to be of the truss type, and I believe the snow load zone is 3 (Dalarna). Today, the living room is open along the entire short side of the house and spans about 9m. In the attic, there are 2 reinforcements anchored to the underside of the roof trusses to support this. Here is a picture of the current floor plan. The red rectangular boxes indicate where the sliding doors will be installed. The blue lines show where the load-bearing supports for the living room are in the attic.
Reminds me a lot of what we've done at home. The section that sits perpendicular to the floor structure, we opened and installed a sliding section about 3m (assumed that they are perpendicular to how you reported the support).
To keep construction measurements down, a steel beam 100x100 was placed above the section. It then rested on combined vertical studs 3x45x145 on either side. This gave smaller measurements above than if done in wood.
The dimensioning here was a simple estimation but I suspect it's more over-dimensioned than under. Gives you an idea at least.
Edit: saw that you have now indicated the direction of the trusses.
The biggest challenge you have, I suspect, is the one under the support, as all the load lands on the new section/reinforcement. An expert should probably suggest a dimension there. Here it is likely other dimensions than 100x100 that apply unless you can land the load on a vertical pillar between section/door, but then you have buckling length to consider and how you distribute downwards to the floor below.
Thank you for the response!
I've contacted a carpenter who's going to check out the job, but it feels like one wants a bit more information to be on the same page.
I've tried looking around online and found guides for laminated timber, and it seems it builds more in height than expected.
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