I'm considering a small extension to an outbuilding. The idea is to fit a bedroom with a loft. I'm pondering what type of roof construction would be best. Ridge beam or some type of truss construction. The roof pitch is about 20 degrees and the extension will be about 3m (ridge length).
A ridge beam with pillars at the gables is easy to calculate with the online calculator from Svenskt Trä. The tricky part is that I want small gable windows in the loft and they should be centered, which requires a lintel for the beam. I've looked into different truss solutions with a raised wall line but have no idea about dimensions, etc. Something like this:
But I don't want the collar beam to take too much of the height (can't build so high due to aesthetic reasons).
I would have chosen a ridge beam and hung the rafters on the side of the ridge beam to save some height. The loads won't be significant, so a beam over the window doesn't need to be that high. How big is the window?
I would have chosen a ridge beam and hung the roof rafters on the side of the ridge beam to save some height. There won't be large loads, so a lintel over the window doesn't need to be very high. How large is the window?
What dimensions are we talking about for the lintel, do you think? (Window as mentioned 5x5)
Ridge beam is probably the only reasonable solution. You can experiment a little with the beam dimension. In a sleeping loft, you don't want a lower knee wall height than 700 mm, so it's important to carefully study the beam, any potential overhang, and window design.
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