Hello! Renovating a poorly built conservatory. For various reasons, I want to keep the project at a reasonable level in terms of time and cost. And the current construction has held up for the last 20 years without snow shoveling.
To the question: Would it work to build on the following 145 beam with a glulam beam of 42x180 mm? I would like to install a section of sliding windows.
I was thinking that the glulam beam would be screwed together with the current roof beam and rest on posts directly to the right and left of the window section.
I can build the module for the window section a few cm shorter if it has to fit.
According to Svenskt trä, it looks like it should work - but the dimensioning app asks for cc dimensions of beams and that is not the case here.
Other info: The walls will be extended and insulated, and have new paneling on the outside and inside.
I usually say that a structural engineer should be consulted when it comes to sizing. But look at the other roof beams here. What differentiates the one above the window from these?
Nothing that differs. They are all 145 with a span of 4 meters, but only 60-80 cc (varies). I know it's weak, but as I said, it has held up for 20 years even if I wouldn't have built it that way.
The question was more about whether one can rely on Svenskt trä's recommendation in this case.
If you want to be certain, consulting an engineer is the way to go.
However, if you screw-glue laminated timber resting on pillars, it's not unreasonable to think that the beam will become many times stronger and stiffer than the other beams. That is to say, something else in the construction will give way first.
Yep, that's how it is. I'm not worried about the construction itself. I just want to ensure the window doesn't risk stress, meaning that it won't crack. Hence the extra beam with glulam on that wall.
Go with that. Glue and screw together with the existing beam.
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