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Roofing material is the outermost layer on the roof of a building, sometimes self-supporting, but generally supported by an underlying structure. A building's roofing material provides shelter from the natural elements. The outer layer of a roof shows great variation dependent upon availability of material, and the nature of the supporting ...
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In the United States, fiberglass-based asphalt shingles are by far the most common roofing material used for residential roofing applications. In Europe, they are called bitumen roof shingles or tile strips, and are much less common. [4] They are easy to install, relatively affordable, last 20 to 60 years and are recyclable in some areas.
Shells may be cast in place, or pre-cast off site and moved into place and assembled. The strongest form of shell is the monolithic shell, which is cast as a single unit. The most common monolithic form is the dome, but ellipsoids and cylinders (resembling concrete Quonset huts / Nissen huts) are also possible using similar construction methods.
Concrete shell roof of the garden center Wyss in Zuchwil, (1962) Concrete dome roof of a building of the former company Kilcher in Recherswil, (1965) Highway service area Deitingen south, triangle concrete cupola roofs, (1968) Heinz Isler (July 26, 1926 – June 20, 2009) was a Swiss structural engineer. He is famous for his thin concrete shells.
A shell is a three-dimensional solid structural element whose thickness is very small compared to its other dimensions. It is characterized in structural terms by mid-plane stress which is both coplanar and normal to the surface. A shell can be derived from a plate in two steps: by initially forming the middle surface as a singly or doubly ...
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The system has a numerical "coding schedule" of 10 digits to code the materials. It consists of groups, sub- and sub-sub-groups of 2 digits each, and a "Buying description" of 3 digits. Local coding is allowed for every company. The last digit for central coded materials is a 1, the last digit for local coded materials is a 9.
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