Hello,
I am working on a small building project where the window sections are sometimes a bit wide. I would need some type of beam above. I read on träguiden.se that you can use so-called box beams: "Supporting over several stud bays is easiest done with box beams of K-plywood that are nailed and glued to flanges of structural timber."
I can hardly find anything when I google "box beams."
Three questions. 1. Can you buy ready-made box beams, or do they have to be manufactured on-site? 2. What does "to flanges of structural timber" mean? 3. I assume one advantage of a box beam is that they can be filled with insulation? Must it be a type of foam that is sprayed in afterwards through a drilled hole, or should fiber insulation be stuffed in beforehand?
I am working on a small building project where the window sections are sometimes a bit wide. I would need some type of beam above. I read on träguiden.se that you can use so-called box beams: "Supporting over several stud bays is easiest done with box beams of K-plywood that are nailed and glued to flanges of structural timber."
I can hardly find anything when I google "box beams."
Three questions. 1. Can you buy ready-made box beams, or do they have to be manufactured on-site? 2. What does "to flanges of structural timber" mean? 3. I assume one advantage of a box beam is that they can be filled with insulation? Must it be a type of foam that is sprayed in afterwards through a drilled hole, or should fiber insulation be stuffed in beforehand?
1. Don't know
2. This means that studs of construction timber should be used at the outer edges, and the plywood sheets should be glued and nailed to these studs. Look in this thread for examples of appearance: https://www.byggahus.se/forum/threads/konstruera-ladbalkar.201055/
3. Yep, fill them with insulation, regular boards work great to put in before you "close" the beam with plywood.
2. This means that studs of construction timber should be used at the outer edges, and the plywood sheets should be glued and nailed to these studs. Look in this thread for examples of appearance: https://www.byggahus.se/forum/threads/konstruera-ladbalkar.201055/
3. Yep, fill them with insulation, regular boards work great to put in before you "close" the beam with plywood.
Thanks for the reply. Yes, I saw that thread earlier, there were some responses there about how he/she should buy box beams instead as a glue jig was required, so I wondered. Ok, I guess it's just as well to simply craft your own. Alternatively, use glue-laminated beams.
Box beams are easy to build yourself. What you need is a whole lot of clamps.B Bjornedorne said:Hi,
I'm working on a project for an attefall house where the window sections are sometimes a bit wide. I would need some type of beam above them. I read on träguiden.se that you can use so-called box beams: "Reinforcements over several stud spaces are most easily made with box beams of K-plywood that are nailed and glued to flanges of structural timber."
I can hardly find anything when I google "box beams".
Three questions. 1. Can you buy ready-made box beams, or do these have to be made on site? 2. What does "to flanges of structural timber" mean? 3. I assume one advantage of box beams is that they can be filled with insulation? Does it have to be foam that is sprayed in afterward through a drilled hole, or should you stuff in fiber insulation beforehand?
Fill it with regular glass wool before you attach the second wall.
I have absolutely no experience, but it doesn't seem unreasonable that it would be much easier with pre-made beams! The price probably doesn't matter much for these particular parts for me, as it'll be a relatively small portion of the total anyway...
When using LVL or glulam beams, I assume you have a stud standing on its edge and still allow space for insulation, with similar dimensions to the construction timber? Because aren't they stiffer even with the same thickness as timber? Or will it be a solid beam that takes up the entire width of the wall? Wouldn't this be poor in terms of insulation? As you can see, I'm a bit of a beginner at this.
When using LVL or glulam beams, I assume you have a stud standing on its edge and still allow space for insulation, with similar dimensions to the construction timber? Because aren't they stiffer even with the same thickness as timber? Or will it be a solid beam that takes up the entire width of the wall? Wouldn't this be poor in terms of insulation? As you can see, I'm a bit of a beginner at this.
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