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2. What to Consider Before You Choose a Roofing Material - AOL

   www.aol.com/consider-choose-roofing-material...

   These dark stains take away from aesthetics and make a roof look older. Pros and Cons of Metal Roofs Metal Roof Pros: Long lifespan. On-trend designs. Potential energy savings. Low-maintenance.

3. Metal roof - Wikipedia

   en.wikipedia.org/wiki/Metal_roof

   A metal roof is a roofing system featuring metal pieces or tiles exhibiting corrosion resistance, impermeability to water, and long life. It is a component of the building envelope. The metal pieces may be a covering on a structural, non-waterproof roof, or they could be self-supporting sheets.

4. List of commercially available roofing materials - Wikipedia

   en.wikipedia.org/wiki/List_of_commercially...

   Tile roofing traditionally consists of locally available materials such as clay, granite, terracotta or slate, though many modern applications contain concrete. Imbrex and tegula, style dating back to ancient Greece and Rome. Monk and nun, a style similar to Imbrex and tegula, but basically using two Imbrex tiles. Dutch roof tiles, Netherlands.

5. Galvannealed - Wikipedia

   en.wikipedia.org/wiki/Galvannealed

   Galvannealed. Galvannealed or galvanneal (galvannealed steel) is the result from the processes of galvanizing followed by annealing of sheet steel. Galvannealed steel is a matte uniform grey color, which can be easily painted. In comparison to galvanized steel the coating is harder, and more brittle.

6. Open web steel joist - Wikipedia

   en.wikipedia.org/wiki/Open_web_steel_joist

   Steel joists and Joist Girders being erected. In structural engineering, the open web steel joist (OWSJ) is a lightweight steel truss consisting, in the standard form, of parallel chords and a triangulated web system, proportioned to span between bearing points. The main function of an OWSJ is to provide direct support for roof or floor deck ...

7. Fink truss - Wikipedia

   en.wikipedia.org/wiki/Fink_truss

   The first Fink Truss bridge was built by the Baltimore and Ohio Railroad in 1852 to span the Monongahela River at Fairmont, Virginia (now West Virginia). It consisted of three spans, each 205 feet long. It was the longest iron railroad bridge in the United States at the time. Several other Fink trusses held world records for their time ...