Considerations on roofing design of steel structure workshop
Impervious: Prevents rainwater from seeping from the outside into the metal roof plate. Rainwater is mainly through the bridging gap or node into the metal roof. To achieve the function of seepage, need to use the screw mouth sealing gasket After using a concealed fixed, in the lap of the board with sealant or welding treatment, it is best to use a long board to eliminate lap, in various nodes of the abdomen tight water treatment.
Fire prevention:steel structure Metal roofing material will not burn when a fire occurs, and the flame will not penetrate the metal roof panel.
Anti-wind Pressure: resistance to the local maximum wind pressure, metal roof panels will not be negative wind pressure pull off. The wind resistance is related to the fastening force of the metal roofing plate and the fixing seat, and the density of the fixing seat.
Soundproofing:steel structure Prevents sound from reaching indoors or from indoor to outdoor. In the metal roof layer filled with sound insulation material (usually by the insulation of cotton), sound insulation effect on the metal roof layer on both sides of the sound intensity difference decibel. Sound insulation effect and noise insulation material density, thickness. Should note: Sound insulation materials on different frequencies of the noise barrier effect is not the same.
Ventilation: Indoor and outdoor air exchange. A vent is arranged on the metal roof.
Moistureproof: Prevent water vapor condensation in the bottom of metal roof and metal roof layer, and drain water vapor in metal roof layer. The solution is to fill the metal roof layer insulation cotton, metal roof floor cover waterproof membrane, metal roof board has ventilated nodes.
Load bearing: Withstand construction load, rainwater, dust, snow pressure, maintenance load. The load-bearing performance of the metal roofing plate is related to the sectional characteristics of the plate type, the strength thickness of the material, the transmission mode and the spacing of the Purlin (Purlin).
Lightning protection: The thunderbolt to the ground, to prevent lightning breakdown metal roof into the room.
Insulation: Prevent heat transfer on both sides of the metal roof, so that the indoor temperature is stable. insulation function by filling in the metal roof insulation material (commonly used in glass wool, rock wool) realization,steel structure the effect of insulation in U value, Unit is W M2k. The insulation performance is determined by the following factors: The raw material, density, thickness of the insulation cotton, the moisture of the insulating cotton, the connection mode of the metal roof plate and the lower structure (to prevent the "cold bridge" phenomenon), the repeated ability of the metal roof layer to the thermal radiation.
Lighting: Daytime through the skylight to improve indoor lighting, save energy. In the specific location of the metal roof lighting board or daylighting glass, should consider the service life of the skylight and the metal roof panel coordination, in the skylight and metal roof board connection to do a good job in water treatment.
Appearance: Metal roofing has good texture and pleasing color.
Control and contraction of the metal roof plate to control the contraction of displacement and direction.steel structure Ensure that the metal roofing plate in the area of large temperature difference will not be caused by the thermal expansion and contraction of the stress caused.
Anti-avalanche: in the snow area of the metal roof to prevent snow railings, preventing the sudden fall of snow.
Anti-icicle: Prevent sleet from forming icicles at cornice