Trä – och betongstommar i tvåvånings småhus : En teknisk och ekonomisk jämförelse

Detta är en M1-uppsats från Mälardalens högskola/Akademin för ekonomi, samhälle och teknik; Mälardalens högskola/Akademin för ekonomi, samhälle och teknik

Sammanfattning: It is obvious that in Sweden, houses are built out of wood instead of concrete, and that is because of all the forests that the country has. Building houses out of wood has its benefits, for example it does not have any heavy construction, but wood is a delicate material and it can be sensitive when it comes to wet, that is why there always have to be other options of structures like for example concrete. Both Prefabricated concrete and wood structures are built in a factory, which reduce the risk of exposing the building to moisture, or cold, which in turn can lead to impaired quality of the material.  To protect the frames, an installation of a weather protection is done on the frame, but this makes the project more expensive. This thesis is based on literature studies, interviews with NM Bygg AB in Norrkoping and Peab in Vasteras, it is also based on a computer program named Bidcon. This program clarified the differences between wood and prefabricated concrete structures both in price and between times. The final goal with this work is to demonstrate and show the technical and economical differences between two different options of carcasses and to decide which option is the most preferable and profitable to be used to construct a two-story house. The technical part includes fire safety, moist resistance and sound resistance. The result showed that prefabricated concrete structures have better sound, fire and moisture properties compared to wood frames in terms of technical properties. Although concrete structures have these technical advantages, it is still possible to build with wooden frames if the technical areas are treated with some care. While in price, the wooden frame has a lower overall cost than the concrete frame. The end result of this thesis shows that there are some differences between wooden frames and concrete when it comes to the technical or economical parts. Both options could meet the requirement to build a two-story house, for example bearing capacity, moisture safety and the sound insulation. Since prefabricated concrete structures have shorter construction times, there will be lower workplace costs compared with wood-frames. Both frames are mounted in the workplace, but what separates these two bodies from each other is time for assembly and construction costs. Prefabricated wooden frames have longer construction time compared to prefabricated concrete structures. Higher material cost for the concrete frame, however,  this means that the concrete frame will be 155,000 SEK more expensive than the wooden frame for the studded house with 156 m2 total floor area (use area). An important limitation is that this is a study example with a number of specific conditions and simplifications. Ultimately, of course, it is up to the customer to choose the most appropriate frame.

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