In the field of construction, as construction requirements continue to increase, building supporting materials must also be upgraded. In the past, the roofing materials on the top of the building were mainly tiles, color steel plates and other materials. In recent years, metal roofs have gradually replaced these traditional roofing materials and have been very maturely applied to some urban infrastructure projects and large exhibition halls. Compared with traditional roofing materials, in addition to the beautiful appearance full of metallic texture, metal roofs also have very practical advantages.
- Fireproof and waterproof
The metal roofing system has good waterproof and fireproof performance, which can greatly protect the building and has a high safety factor.
- System structure
The metal roofing system has excellent structure, and it also has the advantages of light weight, strong durability, long service life, and convenient installation.
- Decorative effect
The metal roofing system can present unique personalization according to the flexible changes in the building shape, and has a good decorative effect.
- Stable performance
Since the roof is the place most affected by natural wind, rain, snow, etc., the metal materials used for the roof generally choose copper plates, zinc plates, stainless steel plates, aluminum-magnesium-manganese alloy plates, coated steel plates, etc. with good durability. The durability and waterproof performance of these materials is significantly better than traditional flexible and rigid waterproof systems. Therefore, metal roofing systems generally have the characteristics of relatively long maintenance cycles, simple maintenance, and low long-term calculation costs.
- Environmental protection and energy saving
Metal roofing materials are not only very environmentally friendly and energy-saving, but also have strong adaptability to buildings in different regions, environments and different functional requirements.
Features:
- Overall structural waterproofing and drainage functions;
- Simple, lightweight and safe structure;
- Flexible, fast, accurate and economical construction and installation;
- No need for silicone caulking, avoiding the problem of silicone aging and pollution, and extending the service life;
- Natural circulation ventilation structure, increasing service life;
- Three-dimensional curved arc shaping is easy;
Factors to consider in metal roof design
- Load-bearing
Bear construction load, rain, dust, snow pressure, and maintenance load. The load-bearing performance of metal roof panels is related to the cross-sectional characteristics of the panel type, the strength and thickness of the material, the force transmission method, and the spacing of the purlins (sub-purlins).
- Wind pressure resistance
Resist the local maximum wind pressure, and the metal roof panels will not be pulled off by negative wind pressure. Wind resistance is related to the snap-fitting force between the metal roof panels and the fixings, and the spacing of the fixings.
- Sound insulation
Prevent sound from being transmitted from the outside to the inside or from the inside to the outside. Fill the metal roof layer with sound insulation material (usually insulation cotton), and the sound insulation effect is expressed by the difference in decibels of sound intensity 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 the sound insulation material has different blocking effects on sounds of different frequencies.
- Anti-seepage
Prevent rainwater from seeping into the metal roof panel from the outside. Rainwater mainly enters the metal roof through the overlap gap or nodes. To achieve the function of anti-seepage, it is necessary to use a sealing gasket at the screw mouth and use a hidden fixation, use sealant or welding at the overlap of the board, it is best to use a full-length board to eliminate the overlap, and perform strict waterproofing at various node locations.
- Lighting protection
Lead lightning to the ground to prevent lightning from penetrating the metal roof and entering the room.
- Lighting
Improve indoor lighting through skylights during the day to save energy. Arrange lighting panels or lighting glass at specific locations on the metal roof. The service life of the skylight should be coordinated with the metal roof panel, and waterproofing should be done at the connection between the skylight and the metal roof panel.
- Safety device
Set up fixed facilities on the metal roof to protect the safety of construction and maintenance personnel.
- Anti-icicle
Prevent rain and snow from forming icicles in the eaves.
- Beauty
The metal roof has a good texture and pleasing color.
- Control thermal expansion and contraction
Control the shrinkage displacement and direction of the metal roof panel. Ensure that the metal roof panel will not be damaged by the stress caused by thermal expansion and contraction in areas with large temperature differences.
- Insulation
Prevent heat from transferring on both sides of the metal roof, so that the indoor temperature is stable. The insulation function is achieved by filling insulation materials (commonly used are glass wool and rock wool) under the metal roof panel. The insulation effect is expressed by U value, the unit is W/M2K. The insulation performance is determined by the following factors: the raw material, density and thickness of the insulation cotton; the humidity of the insulation cotton, the connection method between the metal roof panel and the lower structure (to prevent the "cold bridge" phenomenon); the metal roof layer's ability to repeatedly radiate heat.
- Sound absorption
Reduce the reflection of sound and reduce indoor echoes. The sound absorption function is achieved by laying sound-absorbing cotton on the bottom layer of the metal roof and punching holes on the bottom plate. The sound absorption performance of the metal roof is expressed by the sound absorption coefficient a.
- Moisture-proof
Prevent water vapor condensation in the bottom layer and metal roof layer of the metal roof, and drain the water vapor in the metal roof layer. The solution is to fill the metal roof layer with insulation cotton, lay a waterproof membrane on the bottom plate of the metal roof, and have ventilated nodes on the metal roof panel.
With global warming, the El Nino phenomenon is frequent, and natural disasters such as typhoons continue to strike, coastal areas are deeply affected. Traditional roofs are difficult to withstand frequent typhoon and rainstorm disasters, and the popularization of metal roofs has been put on the agenda.
The solidity and sturdiness of metal roofs, as well as their multifunctional and all-season practicality and applicability, have become the object of choice for more and more people, and also provide a guarantee for our safety.
