Hi, I'm wondering how I can achieve a flat roof with a maximum 5-degree slope for an extension/sunroom that is 9 meters long and 4.5 meters wide. The roof can't be as thick as a glulam beam. We live in snow zone 3 and want a sedum roof. This extension will be situated between 2 houses and should appear as seamless as possible. I've heard that you can use self-supporting sheet metal as a roof, is that correct? Or if I should use an H-beam, what type and dimension and material should I use? 120mm spacing between beams? Or are no beams needed with self-supporting sheet metal that is 5 meters resting on the walls? I've searched everywhere for information but haven't succeeded, so I'm trying here. Fingers crossed, Anna-Karin 
:x
:xWhat is the weight of the roof, as there is a very wide range for such roofs, it will probably be difficult without posts/load-bearing walls in the middle with such a small slope..
If you take 150 kg M/2 in zone 3, there are no glulam beams that can handle 4.5 meters..
http://www.byggbeskrivningar.se/dimensionering.aspx?Cid=121
If you take 150 kg M/2 in zone 3, there are no glulam beams that can handle 4.5 meters..
http://www.byggbeskrivningar.se/dimensionering.aspx?Cid=121
I don't want glulam as it is too thick, but I'm looking for steel profiles that can handle this. I'm thinking if you can build large storage with a flat roof, then you should be able to build a small sunroom with a flat roof
The roof weighs at most 120kg/m2... then there will be snow on it so maybe I need to rethink...
The roof weighs at most 120kg/m2... then there will be snow on it so maybe I need to rethink...
HEA beam works perfectly fine and I find it hard to believe that the height of the beams will be higher than the thickness of the insulation you will have anyway. I would consult an engineer for advice and calculation. It shouldn’t cost more than 2000 SEK to get this done. You will still need to present a calculation to the municipality in connection with the building notification/technical consultation. However, it will be quite a lot more expensive with a steel structure compared to wood.
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· Västra Götaland
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There is high-corrected sheet metal that is self-supporting over fairly long spans www.profilplat.se/produkter/takplat/sjalvbarande-plat/