Anti-seepage: to prevent rain from infiltrating into the metal roof panels. Rain mainly through the lap joints or joints into the metal roof. To achieve the function of anti-seepage, the need to use a screw seal after the use of hidden fixed, lap joints at the plate with sealant or welding, it is best to use long plate to eliminate overlap, at various nodes Severe abdominal distension water treatment.
Fire protection: metal roofing materials will not burn in case of fire and the flame will not penetrate metal roofing boards.
Anti-wind pressure: Resist the local maximum wind pressure, metal roof panels will not be pulled negative wind pressure. The wind resistance can be related to the clasp force between the metal roof panel and the fixing base and the density of the fixing base.
Sound insulation: Prevents sound from reaching the interior from the outdoors or from the interior. The metal roofing is filled with sound-proofing materials (usually used as insulation wool) and the soundproof effect is expressed in decibels of sound intensity on both sides of the metal roofing. Sound insulation and sound insulation material density, thickness. It should be noted: sound insulation materials on different frequencies of sound blocking effect is not the same.
Ventilation: Indoor and outdoor air exchange. Set vent on metal roof.
Moisture: to prevent the metal roofing and metal roofing layer of water vapor condensation, drain metal roofing layer of water vapor. The solution is to fill the metal roofing with insulation wool, a waterproofing membrane on the metal roofing panel and a ventilated node on the metal roofing panel.
Load-bearing: bear the construction load, rain, dust, snow pressure, maintenance load. The load-bearing performance of metal roofing board is related to the cross-section characteristics of the board, the strength and thickness of the material, the force transmission method, and the spacing of purlins (secondary purlins).
Lightning: the lightning lead to the ground, to prevent lightning penetrating the metal roof into the room.
Insulation: to stop the heat transfer on both sides of the metal roof, so that indoor air temperature stability. Insulation by filling the metal roof insulation materials (commonly used glass wool, rock wool) to achieve insulation effect in U value that the unit is W / M2K. Insulation performance is determined by the following factors: insulation cotton raw materials, density, thickness; insulation cotton moisture, metal roof panels and the underlying structure of the connection (to prevent the "cold bridge" phenomenon); metal roofing layer on the thermal radiation Repeatability .
Daylighting: Improve interior lighting through skylights during the day and save energy. Laying lighting or glazing at a specific location on a metal roof should be done in harmony with the metal roofing panel in consideration of the service life of the skylight and waterproofing the connection between the skylight and the metal roofing panel.
Beautiful: the appearance of metal roof has a good texture, pleasing colors.
Control of thermal expansion and contraction: Control of metal roof contraction and displacement of the direction. Make sure the metal roof panels will not be damaged by the stress caused by thermal expansion and contraction in the areas with large temperature difference.
Anti-avalanche: set in the snowfall metal roof snow block railing, to prevent the sudden fall of snow.
Icicles: Prevent rain and snow in the cornice to form icicles.
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