Design Considerations For Stone Coated Metal Roofing

Stone-coated metal roofing is made of steel or some other metal. The metal is then coated with stone chips and connected to steel with an acrylic film. The goal is to make the roof more durable while still retaining the aesthetic advantages of traditional roofing materials.

1.The Development History of Metal Roofing

The history of using metal materials as roof coverings can be traced back to the middle of the 12th century. At that time, craftsmen in Germany and some Nordic countries and regions used simple hand tools to install small metal copper sheets through bite seams. On the roofs of some iconic buildings. However, as a building material, sheet metal has been accepted and widely used in general industrial and civil buildings, with a history of fewer than 200 years. Until the mid-19th century, with the development and application of hot-dip coating technology, the application of profiled sheet steel roofing became more and more common, and the scope of this application was also wider.

With the development and advancement of science and technology, new materials, new technologies, and new processes continue to emerge, such as metal processing equipment, metal surface treatment technology, new coating technology, etc., which have brought about the technical improvement of traditional metal roofing systems and the development of application technologies. Unprecedented development, metal roofing has become a construction technology to replace traditional materials to build the top surface of buildings. Especially in the past 30 years, with the development of building metal materials and their processing and spraying technology, metal roofing has become The mainstream form of non-residential buildings on the ground floor.

2.Design Considerations for Metal Roofing

Bearing load

 Bearing construction load, rain, dust, snow pressure, and maintenance load. The load-bearing performance of the metal roof panel is related to the cross-sectional characteristics of the plate type, the strength and thickness of the material, the force transmission method, and the spacing of the purlins (sub-purlins).

Resistance to wind pressure

 It resists the maximum local wind pressure, and the metal roof panel will not be pulled off by negative wind pressure. The wind resistance is related to the fastening force of the metal roof panel and the fixing seat, and the density of the fixing seat.

Sound insulation

 It prevents sound from being transmitted indoors or from indoors to outdoors. Fill the metal roof layer with sound insulation material (usually made of insulation cotton), and the sound insulation effect is expressed by the difference in sound intensity on both sides of the metal roof layer. The sound insulation effect is related to the density and thickness of the sound insulation material. It should be noted that sound insulation materials have different blocking effects on the sounds of different frequencies.

Anti-seepage

 It prevents rainwater from seeping into the metal roof panel from outside. Rainwater enters the metal roof mainly through lap joints or nodes. To achieve the anti-seepage function, it is necessary to use a sealing washer at the screw port and adopt a hidden fixation. Use sealant or welding at the overlap of the board. It is best to use a longboard to eliminate overlap. Tight waterproof treatment for abdominal distension.

Lightning protection

 It leads the lightning to the ground to prevent the lightning from penetrating the metal roof and entering the room.

Daylighting

 It improves indoor lighting through skylights during the day and saves energy. When arranging daylighting panels or daylighting glass at specific locations on the metal roof, the service life of the skylight should be coordinated with the metal roof panel, and waterproof treatment should be done at the junction of the skylight and the metal roof panel.

Safety devices

 It sets up fixed facilities on the metal roof to protect the safety of construction and maintenance personnel.

Anti-icicle

 It prevents rain and snow from forming icicles on the cornice.

Beautify

 The metal roof has a good texture and a pleasing color.

Control thermal expansion and contraction.

 It controls the contraction displacement and direction of the metal roof panel. Ensure that the metal roof panel will not be damaged by the stress caused by thermal expansion and contraction in areas with large temperature differences.

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