Metal roof leakage reasons and counter measures
 
Metal roof leaks cause analysis and countermeasures of light steel construction system construction period is short, because of its high degree of prefabricated buildings and design style, flexible, and the whole construction process for environmental protection etc, have been widely applied in all kinds of buildings. Every year by 8% growth, the construction area of 2001, more than 2000 million square meters, and the building structure has gradually into the large factory, warehouse, supermarket, and sports venues shown more fields, and light steel structure building regional development of dot, line to face, By the coastal economic developed area, the central to the west, By the large and medium-sized cities, villages and towns to comprehensive development tendency is very rapid. At the same time, compared with developed countries, Europe, steel structure building accounted for 40% of the total building area), and our country (area) accounted for just 0.5%, visible, construction steel structure in China is still at the beginning, especially in low-rise residential light steel construction is still in the bud, very broad space for development.

A, light steel structure pressed metal choi roof leakage phenomenon exists:
After market research, at present our country most steel structure roofing, choi board for serious leakage phenomenon hinge in the south area, the phenomenon is more outstanding, and even some steel structure workshop, the factory itself office leaking phenomena also common occurance, leaking mainly focus on pressure xingban lap, roofing daylighting, the gutter took steel and cement metope connection, etc.
Second, sheet metal roof leakage reasons sc:

1, due to the material properties caused by leakage hazard:
(1), metal plate, when their thermal conductivity when great changes have taken place outside temperature, temperature changes due to the environment caused by the temperature changes, color steel contraction deformation and displacement in outlet, thus greatly in sheet metal parts susceptible to leak interface.
(2), steel structure system, the structure itself in temperature change, wind, snow load under the action of forces, etc, and is easy to connect parts in elastic deformation and displacement produced. Leaking
(3), special parts, because use different materials, such as steel parapets and connection of groove joints of wei, the roof with daylighting, due to the stress changes not synchronous, leaking.

2, the structure design or plate type defect caused by leakage hazard:
(1), in the fierce competition in the market, to undertake construction task, and reduce the cost, taste - in order to save the raw materials, the structural design, reduce housing slope, even some below 1/20, susceptible to water, causing the house leaks.
(2), due to cost factors, light steel houses used for pressure wave heights, most of the pull of the lower plate type (effective), and the area of overlapped width less, when building water, easy over board type of overlapped parts, leaking.
In march, the regional characteristic of structure design is not fully considered and waterproof defects:
At present, light steel structure design and regional climate was not considered by different waterproofing measures, such as in the southern monsoon environment waterproof measure, coastal areas under the environment of typhoon season of waterproof measures and northeast snow melts when waterproof measure, has its unique structural features, choose the waterproof materials for this area.
Third, steel structure roofing construction in sheet metal manufacturers in the waterproof material and features:
1, a few advanced technology enterprises. Using butyl rubber sealing, bonding with excellent results. Slack phenomenon seldom occurs.
Part 2, the fluid sealant (known as mastic) or styrenebutadiene rubber seal bond. This material use short-lived, aging. Use about "year, periodic easily aging is leaking.

3, at present domestic most enterprises, using silicone rubber. The material after solidification adhesive strength low. Follow the sex difference, aging, construction process and quality for hidden waterproof, not reliable leaking.
Fourth, to solve the problem of sheet metal roof leak into:
1, reasonable structure design, should be taken into account cost, roofing slope, plate type factors, the best solution.
2 and fully consider the climate characteristics of building area, suitable for this area waterproof measure and materials.
3, because of the metal roof material, learn from foreign advanced experience, should choose the suitable for sheet metal roof waterproof materials, As higher adhesive strength, good follow, and excellent weathering of butyl rubber sealing, bonding with a metal plate roof supporting waterproof materials.

Five, butyl rubber sealing bonding belt for steel structure roofing waterproof features:
1 and material properties: butyl rubber sealing bonded zones are defined and butyl rubber isobutylene blending, according to the special formula, through special process of the production of environmental non-solvent sealing material, binder is as follows:
(1), excellent mechanical properties: adhesive strength, tensile strength and elongation, excellent elasticity, deformation and cracking for interface adaptability.
(2), chemical performance is stable: excellent chemical properties, weathering resistance, ageing resistance and excellent corrosion resistance, ageing resistance time for 20 years.
(3), reliable performance, excellent permanent sticky relay, especially waterproof, sealing, low temperature resistance, excellent performance and follow the general seal is incomparable.

2 and process characteristics: the application of butyl rubber sealing, bonding brought by its excellent material properties, good tackled outlet, or because of stress and displacement occurred not synchronism leakage problems. Hidden The process features:
(1) convenient construction. Use sealing bonding, without waiting, construction, and bond binding a clean surface, the construction is very convenient.
(2) construction environment. Environmental temperature, 15-40 ° c, the humidity in 80% of the normal construction can, strong adaptability to the environment, it is suitable for use in south and northeast.
(3) repair, reliable, and simple process. Waterproof and repair in leaking sealed with bonded area adopted.therefore, simple construction can be covered, safe and reliable.