There are many types of metal roofing, its design needs to consider the many factors required from the load-bearing panels, wind pressure, noise, seepage, lightning protection, lighting and aesthetics, etc. to consider. The following will need to consider metal roofing design to list of nineteen factors:
1, bearing
Withstand construction loads, rain, dust, snow pressure, maintenance load. Performance and load-bearing metal roof plate section properties, the strength of the material thickness, the force transmission means, purlins (Vice purlin) spacing on.
2, wind pressure
Local maximum wind pressure resistance, the metal roof will not be pulled off the negative air pressure. Wind resistance and the metal roof and the bracket buckle together, the bracket density.
3, noise
Reached from the outside to prevent the sound from the indoor or outdoor indoor spread. Fill in the layer of metal roofing insulation materials (usually cotton as insulation), the effect of metal roofing insulation layer on both sides of the sound intensity difference in decibels. Sound insulation and sound insulation material density, thickness. It should be noted: insulation material for different frequencies of sound barrier effect is not the same.
4, seepage
To prevent rainwater infiltration from the outside to the inside metal roof. Rain water mainly through the gap or overlap the node into the metal roof. Impervious to achieve the function, need to screw the mouth after using the gasket fixed with hidden, in the board's lap with sealant or welding process, it is best to use a long-pass plate to eliminate overlap, in a variety of node parts of the abdominal distension tight waterproofing treatment.
5, Lightning
To lead to ground lightning, thunder and lightning to prevent the breakdown of metal roof into the interior.
6, light
Improve indoor lighting through skylights during the day, to save energy. A specific location in the metal roofing panels or lighting glass lighting arrangement should be considered the life of the metal roof skylights, in coordination with the metal roof skylights connection waterproofing treatment.
Safety devices
Set on the metal roof fixed facilities to protect construction workers and maintenance personnel.
7, anti-icicle
Rain and snow at the eaves to prevent icicles formed at.
8, beautiful
Metal roofing looks good texture, pleasing color.
9, control thermal expansion and contraction
Control the contraction of the metal roof displacement and direction. Ensure that the temperature difference between the metal roof in the area will not produce thermal expansion and contraction of stress and damage.
10, insulation
Prevent heat transfer on both sides of the metal roof, indoor temperatures stable. Function through the roof insulation under the metal fill insulation materials (commonly used with glass wool, rock wool) to achieve the insulation effect to the U-value, the unit is W/M2K. Insulation by the following factors: cotton insulation materials, density, thickness; insulation cotton humidity, and lower metal roof structure connection (to prevent "cold bridge" phenomenon); metal roofing layer capabilities of the repeated thermal radiation.
11, sound-absorbing
Reduce the reflection of sound and reduce echo chamber. Sound-absorbing function by the underlying metal roof were laid in the sound-absorbing cotton and punching on the floor to achieve. The acoustic properties of the metal roof to a sound absorption coefficient, said.
12, moisture
To prevent the bottom of the metal roofing and metal roofing layer water vapor condensation to drain away the water vapor layer of metal roofing. The solution is filled in the metal layer of roof insulation cotton, capped with metal roof home floor waterproof membrane, metal roof can be ventilated on the node.
13, fire
Metal roofing materials when the fire is not burning, the flames will not penetrate the metal roof.
14, ventilation
Indoor and outside air exchange. Set on the metal roof vents.
15, anti-avalanche
In the snow on the roof area of ​​the metal railings set to block the snow to prevent a sudden fall of snow.
16, no pollution
Metal roofing materials will not cause environmental pollution, light metal roof surface without dye.
17, normal life
Metal roofing the main building life should be the same as 25 years, 50 years, 100 years.
18, maintenance
Facilitate the use of metal roofs in the maintenance period, reducing maintenance costs.
19, the cost
Control of the metal roof construction costs.
Metal roofing is a relatively wide scope, from large public buildings to factories, warehouses, residential and others have used sheet metal roofing. Effective solution to traditional metal roofing roofing some of the defects.
edited by stone coated steel roofing