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STONE COATED Metal roof leaks Causes of construction technology

 Published:2011-10-22 13:01:45    Source:    Views:2849

STONE COATED Metal roof leaks Causes of construction technology

A steel building system overview:
Steel building system because of its construction period is short, prefabricated high degree of architectural and design flexible and conducive to environmental protection throughout the construction process, etc., are widely used in various types of buildings. 8% annual growth rate, the construction area of ??about 2001, more than 20 million square meters, the building structure has been gradually going deeper into the large factories, warehouses, supermarkets, office buildings and hotels and sports stadia and other fields, and light steel construction regional development from the point, line to the surface; by the economically developed coastal areas, central to the west; from large cities, medium-sized cities to the towns in all sorts of very rapid development momentum. At the same time, compared with developed countries, Western and Japanese steel construction housing construction accounted for 40% of the total (area), while China accounted for only 0.5% (area), we can see, China's construction steel is still in its infancy, especially type of low-rise light steel in residential construction is still in its infancy today, very broad space for development.
 
Second, color steel plate pressed stone coated metal roof leaking common:
After market research, China's most steel color plate hinged to the roof leaking severely, in the south region of the more striking, and even some steel manufacturers its own factories, offices to frequent occurrence of the phenomenon of leakage, water leakage mainly in the pressure plate overlap, with roof lighting, gutters, steel and cement wall to connect other parts.
 
Third, the stone coated steel roof leaks Causes of:
1, due to leakage caused by hidden material properties:
(1), its thermal conductivity coefficient of metal plate, when the outside temperature when significant changes occur, due to environmental temperature changes, temperature changes due to deformation caused by contraction of color plates have a greater displacement in the interface, which in most parts of the interface plate easy to produce leakage risks.
(2), steel structure system, due to temperature changes in the structure itself, the wind load, snow load and other external forces, prone to elastic deformation, resulting in the displacement of joints resulting from water leakage problems.
(3), special parts, the use of different materials to connect, such as the parapet and ditch plate Wei connections through the system, with other parts of the roof light, due to the stress changes are not synchronized, resulting in water leakage problems.
2, housing or plate-type structural design defects caused by leakage risks:
(1), in the fierce market competition, the construction side to undertake the task, and - reduce the cost of taste, in order to save raw materials, the structural design, reducing the housing slope, and even some less than 1 / 20, easy to produce product water, resulting in housing leakage.
(2), due to cost factors, currently used in light steel houses pull-pressure, wave height most of the lower plate (effective area), and the overlap width of less water when the house when the diffuse easily through board type overlap area, resulting in leakage.
3, the geographical features in the structural design is not fully consider the defects caused by water:
Present in our light steel structure design, does not take into account regional differences in climate and water use of different measures, such as the rainy season in the south of the water environment measures, coastal environment of the typhoon season and Northeast waterproofing waterproofing when the snow melts , has its own structural characteristics, use waterproof materials for the region.
 
Fourth, the current stone caoted  steel sheet metal roofing manufacturers in the selected project in waterproof material and features:
1, a small number of technologically advanced companies. The use of butyl rubber sealing adhesive tape, with excellent results. Leakage phenomenon rarely occurs.
2, some businesses have adopted sealing strips (commonly known as clay) or styrene-butadiene rubber sealing adhesive tape. The material life is short, easy to aging. About the life cycle ', the highly aging leakage.
3, the vast majority of domestic enterprises, the use of silicone rubber. The material solidified adhesive strength is low. Poor follow, easy to aging, the process of man-made hazards and more construction, water quality, reliable, easy to leak.
 
5 to address the problem of leaking stone coated steel roof of:
1, reasonable structure design, the cost should be considered, roof slope, plate and other factors, and seek the best solution.
2, give full consideration to the building where the regional climate characteristics, the use of appropriate measures in the area of ??water and materials.
3, the material properties of thestone coated steel roof, while the advanced experience from abroad, should be used for metal roof waterproofing materials; such as high bond strength, good to follow, as well as excellent weather resistance of butyl rubber sealing adhesive tape, as the metal plate supporting the roof waterproof material.
 
Six bonded with butyl rubber sealing characteristics for steel roofing
1, the material properties: butyl rubber waterproof seal is bonded with butyl rubber and polyisobutylene blend is made in accordance with a special production formula, through a special process produced environment-friendly solvent-free adhesive seal material, with the following features:
(1), excellent mechanical properties: adhesive strength, tensile strength and elongation, excellent flexibility, deformation and cracking of the interface adaptability.
(2), very stable chemical properties: excellent chemical resistance, weather resistance, aging resistance and excellent corrosion resistance, aging resistance for up to 20 years.
(3), Reliable application performance: excellent permanent adhesion, especially water, sealing, excellent performance, low temperature and to follow, is the common seal can not be compared.
2, process characteristics: The butyl rubber sealing adhesive tape, the use of its excellent material properties, a good solution when the interface displacement occurs, or because of stress leakage risks arising out of sync problems. The process is characterized mainly as follows:
(1) convenient construction. Easy to use construction adhesive sealing, no waiting, once bonded in place, and the bonding surface is clean, the construction is very convenient.
(2) construction of low environmental requirements. Ambient temperature 15-40 ℃, humidity of 80% or less can be the normal construction, has a strong environmental adaptability, ideal for the South and Northeast regions.
(3) Repair and reliable, simple process. Repair leaking water at the site just use one side covered with adhesive sealing both, the construction is simple, safe and reliable.
 
Seven domestic stone coated steel steel roof shape up to a dozen, according to the major domestic application of the color plate board type, we recommend sealing with a butyl rubber adhesive application nodes as shown below:
Specifications applicable to the legend shape or position
Double-sided tape
1.5mX15mm
Chi-angle type Ⅰ Ⅱ Ⅲ type
YX15-225-900
HY-135
YX41-210-420
Thermal insulation composite panels
YX35-125-750
Wave plate
Metal plate length to overlap
Sided adhesive tape
(Non-woven fabric, aluminum foil) gutters
Roofing Repair
Dome
Roof vents
Double-sided tape
1.5mmZ20mm roof light with
Solar panels
Double-sided tape
3.0mmX12mm LD820A
Roof light with

Eight bonded with butyl rubber seal in the shape type of  stone coated steel  roof  pressure in the construction process:
1, the new steel roof construction process color plates (which can refer to the corresponding chart);
(1) According to the color plate board type or occupies a position of the gap, joint width, use double-sided adhesive with different specifications;
(2) the color board occupies a position to wipe clean;
(3) color plates from one end of the sealing tape slowly to open along the seam sealing tape will stick to the lower plate of the lap at the color, then gently press the tape to bond firmly with color plates;
(4) tear tape sealing the top of the separation of paper, the color of the interface plate pressed into the upper junction, the order by hand after squeezing adhesive joints, so that the seam adhesive solid.
(5) Tighten the screws so that the surface bonding adhesive bonding to bring under dense.
2, steel roofing repair construction process (refer to the corresponding page on the chart):
Based on the current site of the leak steel roof leaks, leaking because of the investigation, analysis and repair, we found that the main part and the following reasons:
(1), leaking roof overlap, mainly due to shrinkage caused by roof color plate where a displacement, making the silicone rubber and steel from the common seal and the leakage;
(2), roof and cement wall junction leakage, mainly due to stress caused by silicone rubber is not synchronized with the adhesive surface cracking and leaking.
Leakage sites and for different reasons, we use different techniques to repair:
A, in paragraph (1) case, we use the following repair process:
a, the silicone rubber roof lap at all removed:
b, the color stone coated steel roof repair parts to wipe clean;
c, according to leaks in the seams of different specifications to choose single-sided adhesive band;
d, with single bonded directly at the seams with cover.
e, the order of hand-rolling after bonding at the repair, so one-sided strong adhesive bonding at the seams.
B, in paragraph (2) case, with cement walls and roof gutters with, for example, using the following repair process:
a, clear color with the cement wall board seams of silicone rubber;
b, the color plate and wipe clean the cement wall junction, requires no cement wall from the sand, if necessary, Xu brush primary treatment agent (PU: benzene = 1:2 (volume):
c, in the color plate and cement paste at the wall joints with a single bond, and rolled by hand in order to make a solid bond with the adhesive.
 
Nine, the use of butyl rubber sealing bonding with the note:
1, will be glued before using surface water, oil, dirt etc. cleaned.
2, the butyl rubber seal is a cold bonding with the construction of self-adhesive tape, adhesive should be a place, can not be repeated paste.
Butyl rubber seal bonded with a good solution in astone coated steel roof, the waterproofing materials for supporting its own defects and leakage is a major problem, and its excellent waterproof effects and simple construction techniques, so that steel pressure type waterproof roof plate is no longer troubled by the problem of owners and construction unit. Butyl rubber sealing adhesive tape, with its 20-year aging period truly waterproof effect and structure with life, virtually eliminating the pressure plate hidden roof leaks, the roof is high-quality steel pressure plate indispensable supporting waterproof material.

edited by china stone coated steel roofing
 

 

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