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2. Metal roof - Wikipedia

   en.wikipedia.org/wiki/Metal_roof

   Thin-film solar is light weight at 2.1–3.1 kg/m 2 (7–10 oz/sq ft). Thin-film solar panels last 10–20 years [16] but have a quicker ROI than traditional solar panels. The metal roofs last 40–70 years before replacement compared to 12–20 years for an asphalt shingle roof. [17]

3. Shipping container architecture - Wikipedia

   en.wikipedia.org/wiki/Shipping_container...

   Additionally, although the two ends of a container are extremely strong, the roof is not. In the case of a 20-foot-long (6.1 m) container, the roof is built and tested only to withstand a 300 kg (660 lb) load, applied to an area of 61 cm by 30.5 cm (2 ft by 1 ft) in the weakest part of the roof. [4]

4. Corrugated galvanised iron - Wikipedia

   en.wikipedia.org/wiki/Corrugated_galvanised_iron

   Corrugated galvanised iron (CGI) or steel, colloquially corrugated iron (near universal), wriggly tin (taken from UK military slang), pailing (in Caribbean English), corrugated sheet metal (in North America), zinc (in Cyprus and Nigeria) or custom orb / corro sheet (Australia), is a building material composed of sheets of hot-dip galvanised ...

5. Framing (construction) - Wikipedia

   en.wikipedia.org/wiki/Framing_(construction)

   Steel panels are popular roof coverings in some areas, preferred for their durability. Slate or tile roofs offer more historic coverings for light-frame roofs. Light-frame methods allow easy construction of unique roof designs; hip roofs, for example, slope toward walls on all sides and are joined at hip rafters that span from corners to a ridge.

6. Stone-coated metal roofing - Wikipedia

   en.wikipedia.org/wiki/Stone-coated_metal_roofing

   A stone coated metal roof is a roof made from steel or some other metal; the metal is then coated with stone chips and attached to the steel with an acrylic film. The goal is a more durable roof that still retains the aesthetic advantages of a more traditional roofing material [1]

7. Purlin - Wikipedia

   en.wikipedia.org/wiki/Purlin

   In steel construction, the term purlin typically refers to roof framing members that span parallel to the building eave, [5] and support the roof decking or sheeting. The purlins are in turn supported by rafters or walls. Purlins are most commonly used in Steel Framed Building Systems, where Z-shapes are utilized in a manner that allows ...