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2. Metal roof - Wikipedia

   en.wikipedia.org/wiki/Metal_roof

   Metal roofs are 100% recyclable and can be made from other recycled products. Asphalt shingles are petroleum based with other chemicals making their recycling process more toxic, most shingles are not recycled and 20 billion pounds (9.1 million tonnes) are sent to landfills every year and take hundreds of years to decompose.

3. List of roof shapes - Wikipedia

   en.wikipedia.org/wiki/List_of_roof_shapes

   Gable (ridged, dual-pitched, peaked, saddle, pack-saddle, saddleback, [5] span roof [6]): A simple roof design shaped like an inverted V. Cross gabled: The result of joining two or more gabled roof sections together, forming a T or L shape for the simplest forms, or any number of more complex shapes.

4. Gothic-arch barn - Wikipedia

   en.wikipedia.org/wiki/Gothic-arch_barn

   It was the most popular roof design for barns sold by Sears. [7] In 1915, Sears sold a 42-by-60-foot (13 m × 18 m) Gothic-arch barn for $1,500. All materials were pre-cut and finished and shipped by railroad to the customer for local assembly.

5. Roof - Wikipedia

   en.wikipedia.org/wiki/Roof

   Its low cost and easy application made it the most accessible commercial roofing, worldwide. Since then, many types of metal roofing have been developed. Steel shingle or standing-seam roofs last about 50 years or more depending on both the method of installation and the moisture barrier (underlayment) used and are between the cost of shingle ...

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. Stressed skin - Wikipedia

   en.wikipedia.org/wiki/Stressed_skin

   Section from the original Britannia Bridge, showing top and bottom stressed-skin construction. William Fairbairn documented the development of the Britannia and Conwy tubular bridges for the Chester and Holyhead Railway in 1849; [4] in it, Fairbairn describes how Robert Stephenson enlisted his aid to revise Stephenson's original concepts, which would route rail traffic inside riveted steel ...