Hi, I'm trying to sketch a bit of how our extension is made. The reason is that I want to notch out the glulam beams on the sides and build a (load-bearing) stud wall as compensation.
This is what it looks like. I haven't fully exposed the construction, so the red triangle is an area I don't know how it looks. I haven't been able to measure the dimensions of the beams either. The roof is metal with insulation and paneling underneath (open to the ridge).
In the side-positioned beams, I want to notch out for windows (otherwise they'll be too low). So there will of course be posts next to the notching and studs with c-c 600 (45x95) for the rest of the walls. That is, go from a self-supporting beam of 4.8m to a regular stud frame with openings for windows (and a door). But I'm trying to estimate how little of the beams I can keep. According to the wood guide for openings in external walls:
A 45x145 C30 is sufficient. Can I then say that it's enough to keep 145mm height of the beam just at the opening, and place posts next to it? Or is that optimistic? The support reaction in the posts is 2 x 7.4 kN in this case. Sounds low?
I tried calculating a roof with 2 x 3.3m span as below. Here, the support force is 8.4 kN per joist c-c 1200.
Yeah, can anyone point out if I'm on the right track? Sounds like 145mm of saved beam above the window should be sufficient.
