En hållbar samhällsutveckling beror på tre faktorer; naturen, människan och samhället. I dagens läge vill människan minimera de påfrestningarna som miljön och omgivningen utsätts för. Det är därför viktigt att se över hur resurserna utnyttjas. Ett bra exempel på detta är att befintliga trafikleder inom tätbebyggda städer byggs över, sådana projekt kallas överdäckningar. På detta sätt skapas både byggbar yta och negativa effekter av trafikleder minskas inom tätbebyggda områden.

The background to this final thesis is that our mandator, A-hus, was interested to examine which roof system that would be most appropriate to their types of houses. To investigate this, we first conducted an evaluation of the most commonly used roof systems in Sweden today: decking, board, roof cloth and prefabricated roof cassettes.To gather information about the different systems we have conducted interviews with several professionals within the construction industry, done an extensive literature study, and gathered information from the Internet.Based on the evaluation of roof systems and the literature, we analyzed advantages and disadvantages of the roof systems from three main perspectives: system characteristics, economics and other characteristics. We found these perspectives to be the most relevant when selecting a roof system.The main perspectives comprise three categories which are graded. These grades are then added together for a score for each main perspective and a total score for the three main perspectives. Then we compared the systems and, based on the scores, suggested one roof system as the most suitable for A-hus.Our result suggests that the prefabricated roof cassettes probably is the best solution for A-hus, but only if it is possible to standardize the cassettes and still maintain the flexibility to match A-hus? house types.

The purpose of this Master Thesis has been to investigate the possibilities for a new type of noise reduction solution that could decrease the negative effects resulting from larger traffic roads. The idea has been to construct a noise barrier with a roof ? like a tunnel placed on a road. The choice of material has been focused on transparent materials in order to lower visual intrusion and barrier effects. This project idea is called the Noise tunnel.After having investigated the current offer of noise solutions, it has been concluded that these solutions rarely provide a sufficient level of noise reduction ? at least not when government regulations of acceptable noise levels are applied.

Analytiker betonar att produktutveckling är viktigt för att lyckas i skogsindustrin. De nordiska sågverken fokuserar idag på att förbättra sin marknadsposition genom produktförnyelse, nya marknadsstrategier och omstrukturering av värdesystem. Ett företag som gjort detta är AB Karl Hedin. Företaget har fått stark genomslagskraft genom egna produkter. AB Karl Hedin avser att till byggsäsongen 2013 lansera en ny egen produkt: En färdig ?modultrall? med längden 3,0 m.