Which aspects should be considered in the prefabricated steel structure factory roof design?
Anti-seepage
Prevents rainwater from seeping into the metal roof panels from the outside. Rainwater mainly enters the metal roof of the prefabricated steel structure factory through lap joints or joints. In order to achieve the function of anti-seepage, it is necessary to use a sealing gasket at the screw port and use hidden fixing, and use sealant or welding at the lap joints of the boards, and use longer boards to eliminate lap joints, and abdominal distension at various joints Strict waterproof treatment.
Fire Protection
In the event of a fire, the metal roofing material will not burn, and the flames will not penetrate the metal roofing panels of the steel structure factory.
Wind Pressure
Resisting local wind pressure, the metal roof panel of the prefabricated steel structure factory will not be pulled off by negative wind pressure. The wind resistance performance is related to the fastening force between the metal roof panel and the fixing seat, and the density of the fixing seat.
Sound Insulation
Stop sound from going from outside to inside or from inside to outside. The metal roof layer of the prefabricated factory shed is filled with sound-insulating materials (usually thermal insulation cotton), and the sound insulation effect is expressed in decibels of the sound intensity difference 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 sounds of different frequencies.
Prevent the condensation of water vapor in the metal roof layer and the metal roof layer of the steel structure factory, and drain the water vapor in the metal roof layer. The solution is to fill the metal roof layer of the prefabricated steel structure factory with thermal insulation cotton, lay a waterproof membrane on the bottom plate of the metal roof, and have ventilated nodes on the metal roof plate.
Load-bearing
Bear construction load, rain, dust, snow pressure, maintenance load. The load-bearing performance of the metal roof panel of the prefabricated factory shed is related to the section characteristics of the panel shape, the strength and thickness of the material, the force transmission method, and the spacing of the purlins (auxiliary purlins).
Lightning Protection
Lead the lightning to the ground to prevent the lightning from penetrating the metal roof of the prefabricated steel structure factory and entering the room.
Insulation
Prevent heat transfer on both sides of the metal roof of the steel structure factory, and stabilize the indoor air temperature. The thermal insulation function is realized by filling thermal insulation materials (glass wool and rock wool are commonly used) under the metal roof slab. The thermal insulation effect is represented by U value, and the unit is W/M2K. The thermal insulation performance is determined by the following factors, the raw material, density and thickness of the thermal insulation cotton. The humidity of the insulation cotton, the connection method between the metal roof panel and the underlying structure (to prevent the “cold bridge” phenomenon), and the repeated ability of the metal roof layer to heat radiation.
Lighting
Improve interior lighting during the day through skylights and save energy. When arranging daylighting panels or daylighting glass at specific positions on the metal roof of a prefabricated steel structure factory, the service life of the skylight should be coordinated with the metal roof panel, and waterproof treatment should be done at the connection between the skylight and the metal roof panel.
Beautiful
The metal roof of the prefabricated steel structure factory has a good texture and a pleasing color on the outside.
Control Thermal Expansion and Contraction
Control the shrinkage displacement and direction of the metal roof panel of the prefabricated factory shed. Ensure that the metal roof panels will not be damaged due to the stress caused by thermal expansion and contraction in areas with large temperature differences.
Anti-avalanche
Set up snow barriers on the metal roof of the prefabricated steel structure factory in the snowfall area to prevent the snow from falling suddenly.
Anti Icicle
Prevents rain and snow from forming icicles at the cornice.
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