I'm going to make an opening in the exterior wall and create a large kitchen. The roof of the extension (14 degrees) will simply break off from the original roof (33 degrees).
The span will be about 5m.
I initially considered using a laminated beam, but I'm considering a steel beam instead. Does anyone know what dimensions I would need?
Given that we had 1m of snow this year, it has to be a very strong beam, maybe HEA 180?
And does anyone know where I can buy this? I live outside Skövde.
The span will be about 5m.
I initially considered using a laminated beam, but I'm considering a steel beam instead. Does anyone know what dimensions I would need?
Given that we had 1m of snow this year, it has to be a very strong beam, maybe HEA 180?
And does anyone know where I can buy this? I live outside Skövde.
You must have a structural engineer calculate the beam. In addition to the pure loads, there is fire rating to consider, which means that steel beams must be oversized. Glulam is much better in this regard as it does not soften and bend in heat.
The information you have given is not sufficient at all for someone to be able to dimension the beam for you here. Additionally, it must be investigated how the point loads from the new columns can be managed in the foundation.
Such an intervention also requires building permission (or at least a building notification depending on the municipality) since it is an intervention in a load-bearing structure. Contact a structural engineer to get it right from the start!
What you call "a very strong beam" (HEA180) I do not think is sufficient at a span of 5.5m if there are free-standing roof trusses in the house + an extension that should be supported by the beam....
Another thing to consider with such large new openings in the facade is lateral stability. Do you have enough stabilizing walls left, or do you need to stabilize with tension bands?
/Engineer
Such an intervention also requires building permission (or at least a building notification depending on the municipality) since it is an intervention in a load-bearing structure. Contact a structural engineer to get it right from the start!
What you call "a very strong beam" (HEA180) I do not think is sufficient at a span of 5.5m if there are free-standing roof trusses in the house + an extension that should be supported by the beam....
Another thing to consider with such large new openings in the facade is lateral stability. Do you have enough stabilizing walls left, or do you need to stabilize with tension bands?
/Engineer
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Just as several have already written, you must have a structural engineer to calculate that beam, regardless of which material you choose for it.
You have mentioned the span, but it is equally important to know how large the roof is in the other direction. That determines how much total load the beam should support. Similarly, the dimensions of the existing roof are important, as that load should also be borne by the beam. You probably also need a professional to investigate if you have sufficient load-bearing capacity on the foundation where you can place the columns.
You have mentioned the span, but it is equally important to know how large the roof is in the other direction. That determines how much total load the beam should support. Similarly, the dimensions of the existing roof are important, as that load should also be borne by the beam. You probably also need a professional to investigate if you have sufficient load-bearing capacity on the foundation where you can place the columns.
Yes! I set up steel supports on each side, shimmed from underneath with large steel plates that were welded and bolted down into the concrete slab. The supports have also been attached at the top to existing joists with lag screws while the beam was welded to the supports and then wedged against the floor structure.dagodo said:
I can't find the papers now but if I do, I'll write them out... just for fun
In my case, a glulam beam was completely out of the question as I didn't want to hit my head on it when walking under itmycke_nu said:
and didn't want a beam to disrupt and lower the ceiling. I have mine recessed into the ceiling but visible, not clad, just painted but not with any fire protection paint. And if it happens that the beam bends from heat, there's not much left of the house anyway Thank you all for your responses. I was just looking to get an idea of what it's about and see a bit of what others have done. That's why I sat down and calculated it myself (I work as a designer but not in construction, and it's been a while).
Hempularen, you're obviously right that you have to consider the entire roof area. I just did a quick calculation on a distributed load of 10 tons and figured I needed an HEA Beam 280 to have a deflection of 6 mm. The point loads are then 55.3kN. So now I'll check what is needed for a post that can handle this and the foundation. I was planning to cast a reinforced surface where the posts will stand. Does anyone know how large it needs to be to handle approximately 60kN pressure?
_chrille_ what type of steel post did you set up?
The engineer - I am in the process of applying for a building permit, and a new foundation will be made. Other walls that provide lateral stability will remain. But of course, I will think about that. Maybe it's not a bad idea to set it up anyway.
I will, of course, contact a structural engineer before demolishing anything, but it's fun to try it myself first
The fire classification will be different since it's steel. Does anyone know what the requirements are for that? Should it be covered with double gypsum boards?
Hempularen, you're obviously right that you have to consider the entire roof area. I just did a quick calculation on a distributed load of 10 tons and figured I needed an HEA Beam 280 to have a deflection of 6 mm. The point loads are then 55.3kN. So now I'll check what is needed for a post that can handle this and the foundation. I was planning to cast a reinforced surface where the posts will stand. Does anyone know how large it needs to be to handle approximately 60kN pressure?
_chrille_ what type of steel post did you set up?
The engineer - I am in the process of applying for a building permit, and a new foundation will be made. Other walls that provide lateral stability will remain. But of course, I will think about that. Maybe it's not a bad idea to set it up anyway.
I will, of course, contact a structural engineer before demolishing anything, but it's fun to try it myself first
The fire classification will be different since it's steel. Does anyone know what the requirements are for that? Should it be covered with double gypsum boards?
I forgot to write that the total roof area of the extension will be about 36 m2. The house is 12 m long and there will be an opening of 5m. Is it reasonable to assume that half of the roof area will load on the beam?
Surely, do you calculate with a snow load of 250 kg/m2 (in zone 2.5)?
Surely, do you calculate with a snow load of 250 kg/m2 (in zone 2.5)?
Can't figure out the dimension with this info but I can suggest that you should use an HEB instead of HEA and you'll reduce the dimension by about 50%, if you weld in web plates you can reduce it even more.
HEB is basically an HEA with significantly thicker material, these are often used for cranes, etc., due to higher bending stiffness. Also, KKR (square tube) or similar could be an alternative if you want to keep the building height down; the advantage of these is that you can glue on a fire protection board directly onto it in a convenient way and avoid cladding the beam.
Regarding hammer, I've only had good experiences and there is a big difference compared to ordering a beam from a dealer as a private person (I'm guessing about 1/5 of the price) But also check on blocket or with a local scrap dealer.
Regarding hammer, I've only had good experiences and there is a big difference compared to ordering a beam from a dealer as a private person (I'm guessing about 1/5 of the price) But also check on blocket or with a local scrap dealer.
dagodo said:HEB - then I have to dig up my old papers from university
I have now gathered a lot of info and contacted a structural engineer who helped with advice. The total span is 4735mm. After calculating all possible loads that might occur (according to the National Board of Housing, Building and Planning's regulations), it resulted in a total load of 15.6 tons. Moelven recommends a maximum deflection of 7 mm for such a span. I have calculated for 6mm. THEN it will be an HEA 300, HEB 280, or an IPE 360. To support the load, I plan to use glulam as it looks better and handles heat better. The glulam columns will be 115x115, capable of handling a load of up to 93kN. The columns themselves will also be laterally stabilized with the timber walls. The foundation will be redone and reinforced underneath. I can update you when it's finished