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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 ...
[12] Twinwall Polycarbonate sheeting is primarily installed with glazing bars, which secure the sheets down to the frame, whether timber, metal or other framing material. The type of glazing bar used it critical for the strength of the roof and depends on the thickness of polycarbonate and structure design.
Polycarbonate is commonly used in eye protection, as well as in other projectile-resistant viewing and lighting applications that would normally indicate the use of glass, but require much higher impact-resistance. Polycarbonate lenses also protect the eye from UV light.
12.3 19.1 12.2 207 72 In Plane Shear Modulus G12 GPa 33 47 11 30 8 80 25 Poisson's Ratio v12 .77 .83 .53 .74 .53 Tensile Strength Xt MPa 110 110 90 120 120 990 460 Compressive Strength Xc MPa 110 110 90 120 120 990 460 In Plane Shear Strength S MPa 260 210 100 310 150 Thermal Expansion Co-ef Alpha1 Strain/K 2.15 E-6 0.9 E-6 12 E-6 4.9 E-6 10 E-6
The front of a solar panel is very durable whereas the back of a panel is generally more vulnerable. Mounting clamps generally consist of aluminum brackets and stainless steel bolts that secure solar panels to one another on the roof and onto the rails. Clamps often vary in design in order to account for various roof and rail configurations. [12]
In 1960, a 12-foot-wide (3.7 m), 400-pound (180 kg) weather radar dish for the National Weather Service was installed atop the roof when the building became the NWS's headquarters. [ 182 ] [ 183 ] KWO35 , the NOAA Weather Radio station serving the majority of the Tri-State area , transmitted from atop the building and remained there until 2014.
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