Seepage prevention: prevent rain water from seeping into the roof of the house. The rain is mainly through the gap or node into the metal roof. To achieve the cutoff function, need to use the gasket by concealed fixing screws at the mouth, in the joint board with sealant or welding processing, it is best to eliminate the overlap with the full-length plate in waterproof joints tight all abdominal distension.
Fireproof:fire metal roofing materials will not burn, the fire will not penetrate the metal roof panel.
Wind resistance: the resistance of the local maximum wind pressure, metal roof panel will not be negative pressure. The wind resistance is related to the fastening force of the metal roof panel and the fixed seat and the density of the fixing seat.
Sound insulation: to prevent sound from the outside of the room to the indoor or outdoor. In the metal roof layer filled with sound insulation material (usually by thermal insulation cotton as), sound insulation effect on the metal roof layer on both sides of the sound intensity difference db. The sound insulation effect is related to the density and thickness of the insulation material. Attention should be paid to: sound insulation materials for different frequencies of sound barrier effect is not the same.
Ventilation: indoor and outdoor air exchange. Set the vents in metal roof.
Moisture: to prevent water vapor condensation in the bottom of the metal roof and metal roof layer, drain the water in the metal roof layer. The utility model is characterized in that the utility model is characterized in that a thermal insulation cotton is filled in the metal roof layer, and a waterproof film is arranged on the metal roof floor.
Bearing: under construction loads, rain, snow, dust, maintenance load. The metal roof panel and plate section bearing performance characteristics, material thickness, strength, force transfer mode (subpurlin purlin spacing).
Lightning: Thunder and lightning to the ground, to prevent the breakdown of lightning metal roof into the room.
Insulation: to prevent heat transfer on both sides of the metal roof, so that indoor temperature stability. Insulation function through the insulation material filled in the metal roof plate (commonly used glass wool, rock wool), thermal insulation effect with the U value of said unit is W/M2K. The insulation performance is determined by the following factors: raw material, density, thickness of insulation cotton; cotton insulation moisture, connection metal roof panel and the lower structure (to prevent "cold bridge phenomenon"); metal roof layer on the heat radiation ability repeatedly.
Lighting: through the skylight during the day to improve indoor lighting, energy saving. In the specific location of the metal roof lighting panels or lighting glass, should consider the life of the roof and the roof of the house coordination, in the skylight and the roof of the junction of the house to do a good job of water treatment.
Appearance: the appearance of metal roof has good texture, pleasing color.
Control: thermal displacement and direction control shrinkage of metal roofing. Make sure that the metal roof panel in temperature area not stress generated due to thermal expansion and contraction of destruction.
Anti avalanche: in the snow area of the metal roof on the snow fence, prevent the sudden fall of snow.
Proof: to prevent the rain and snow in the icicle icicle formation at the eaves.
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