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2. Laser cutting - Wikipedia

   en.wikipedia.org/wiki/Laser_cutting

   For sheet metal cutting, the focal length is usually 1.5–3 inches (38–76 mm). [7] [8] Advantages of laser cutting over mechanical cutting include easier work holding and reduced contamination of workpiece (since there is no cutting edge which can become contaminated by the material or contaminate the material). Precision may be better since ...

3. List of commercially available roofing materials - Wikipedia

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

   A cedar shake is not the same as a cedar shingle. [3] Asphalt shingle made of bitumen embedded in an organic or fiberglass mat, usually covered with colored, man-made ceramic grit. Cheaper than slate or tiles. The reduced cost of this particular style of roofing is especially apparent in its application and removal.

4. Roof coating - Wikipedia

   en.wikipedia.org/wiki/Roof_coating

   A 35 °C (95 °F) heat reduction was observed on this modified bitumen roof with a white, reflective roof coating. Roof coatings are seamless and when installed correctly, can solve roof leaks on almost any type of roofing material. There are exceptions: "professionals do not recommend using cool coatings over existing shingles.

5. 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.

6. Building material - Wikipedia

   en.wikipedia.org/wiki/Building_material

   For example, an asphalt shingle roof costs less than a metal roof to install, but the metal roof will last longer so the lifetime cost is less per year. Some materials may require more care than others, maintaining costs specific to some materials may also influence the final decision.

7. Federal roofing tax credit for energy efficiency - Wikipedia

   en.wikipedia.org/wiki/Federal_Roofing_Tax_Credit...

   The federal roofing tax credit for energy efficiency is dependent on the cost of the materials used in the renovation. A consumer could only receive a tax credit of up to 30% of the material cost, up to a maximum of $1,500. This credit is for funds spent on the energy-star approved materials, not on installation or labor cost.