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What Are The Factors That Should Be Considered In The Design Of Metal Roof?
Feb 18, 2018


Under construction load, rain, dust, snow pressure, maintenance load. The load-bearing performance of the metal roof panel is related to the section characteristics of the plate type, the strength thickness of the material, the mode of transmission and the spacing of purline.

Resistance to wind pressure

Resist the local maximum wind pressure, metal roof panels will not be pulled by negative wind. The wind resistance has to do with the metal roof panel and the fixed seat.

Sound insulation

Prevent sound from being carried indoors or from indoors to outdoors. The insulation is filled in the metal roofing layer (usually made of insulated cotton), and the sound insulation effect is expressed by the sound intensity on both sides of the metal roof. The sound insulation effect is related to the density and thickness of the insulation material. It should be noted that the barrier effect of sound insulation on different frequencies is different.

Seepage control

Prevent rainwater from seeping into metal roof panels. The rainwater mainly enters metal roofing through joint gap or joint. To achieve the function of seepage control, need to be used in screw mouth sealing washer after using hidden fixed, put it on board with sealant or welding processing, it is best used on long board to remove the lap, in a variety of strict waterproof processing node location.

Lightning protection

Bring the thunder to the ground and prevent the lightning from breaking through the metal roof to enter the room.


Improve indoor lighting through skylights during the day and save energy. In the specific position of metal roofing, it is necessary to consider the use life of the skylight and the metal roof panel, and the waterproof treatment should be done in the connection between the skylight and the metal roof panel.

Safety device

Set up fixed facilities on metal roof to protect the safety of construction personnel and maintenance personnel.

The icicles

Prevent rain and snow from forming icicles at the cornice.


The metal roof has a good texture and a pleasing color.

Control thermal expansion and contraction.

Control the shrinkage displacement and direction of metal roof panel. Ensure that the metal roof plates are not damaged by the stress caused by thermal expansion and shrinkage in large temperature areas.

Heat preservation

Prevent heat from passing on both sides of metal roof to stabilize indoor temperature. The heat preservation function is achieved by filling the insulation material (commonly used with glass cotton and rock wool) under the metal roof panel. The insulation effect is expressed in U value, and the unit is W/M2K. The insulation performance is determined by the following factors: raw material, density and thickness of insulation cotton; The moisture of the insulation cotton, the connection between the metal roof panel and the lower structure (to prevent the phenomenon of "cold bridge"); The metal roofing layer is capable of repeated thermal radiation.


Reduce the reflection of the sound and reduce the echo in the room. The sound absorption function is achieved by placing the absorbent cotton at the bottom of the metal roof and punching through the bottom plate. The sound absorption performance of metal roof is indicated by the sound absorption coefficient a.


Prevent water vapor condensation in metal roof and metal roofing layer, drain water vapor in metal roof layer. The solution is to fill the metal roof with the insulation cotton, the metal roof is covered with a waterproof membrane, and the metal roof panel has a ventilation node.


Metal roofing materials do not burn when a fire breaks out, and the flame does not penetrate the metal roof panel.


Indoor and outdoor air exchange. A vent is set on the metal roof.

The avalanche

In the snow area, the metal roof is set up to prevent the snow from falling suddenly.

No pollution

Metal roofing materials do not produce environmental pollution, and metal roof surfaces are not covered with light.

Normal service life

The service life of metal roofing should be equivalent to the main building, such as 25 years, 50 years and 100 years.


To facilitate the maintenance of metal roof during the use period, and reduce maintenance costs.

The cost of

Control the building cost of metal roofing.