We have a barn that is about 7x14 meters inside, approximately 7 meters up to the ridge. It is completely empty, so to speak. Now we would like to build a room on one side. We want to build a wall and then a roof. We wonder what thickness of the wall and roof we should choose? It is bricked to about 2.10 meters and then framed up the rest with beams on top. The roof of the room or the floor of the upper floor will rest on 3 brick walls that are about 30 cm thick and a wall that we frame ourselves. At the moment, we will not have particularly heavy items on the upper floor, but we would like to dimension it correctly from the start in case we want to use the upper floor as a guest room or something similar in the future. I'm thinking of a normal load. No heavy machinery or anything like that. But it should be able to support a standard floor plan, so to speak. I checked a bit with "svenskt trä" and have concluded that framing the wall and roof/floor with 145x45 studs at 60 cm centers. Or is this overkill? I'm attaching some pictures. At the moment there is a small corner room that we will remove. But we were thinking of building in the same way across the entire width of the barn.
As floor joists, 45x145 can only span just over 2 meters before the deflection becomes too great. How big of a room were you planning?
I was planning to use 3.6 meter lengths. It's almost exactly 3.60 if the ceiling/floor joist rests on the entire wall and the framed wall. The room will then be approximately 3.15 internally.
Then the span will be 3.15 m. You should use 45x220 C 24 beams to completely avoid any deflection. You can use thinner wood in combination with screw-laminated particleboard, but it requires more work and is certainly not cheaper. You have plenty of space in height...
The room needs to be insulated. But it might work to insulate the 95 wall. Maybe I'll go up a notch to 120. It will be a small workshop, so it doesn't need to be as well insulated as a typical house. As long as the stability is good, I'm satisfied. I'm mostly thinking about the future. It should be stable enough to furnish an upper floor if one wishes to do so someday.
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