Discuss usually steel roof leaking problem
Time：[2016-3-30] Hits：5702
Guangzhou Steel News: Discuss usually steel roof leaking problem
Guangzhou Steel tells you: the cause of leaking roof
(1), planning elements
1) "portal frame BOLTED technical specification" provides: portal frame light house roof slope should take 1/8 to 1/20, more rain in the region should take greater value therebetween. In practice, project planning, construction units to save money or for other reasons request to minimize the roof slope, planning units and often die move rigidly prescribed, do not consider the practice situation. Resulting in many of the works of roof slant is too small to form a roof rainwater can not be routed to the gutter, so the roof water to form a roofing seepage scene.
2) planners do not understand the local rainfall also formed the roof slope planning too slow, too small cross-sectional area of gutter important element.
3) the lack of a node planning, construction units randomly selected node practice at the roof parapet high enough, projecting roof duct, the exhaust passage improper orientation or high enough so that the impact of construction difficulties waterproof layer.
4) plate poor choice. For dark button and bite-type plate, as long as the field devices properly, usually do not have much of a problem, but if the use of the kind of direct plate by self-tapping screw connection, even if the scene very well, waterproof glue it mildly, thermal expansion and contraction due to the performance of the panel will show leakage 5) holes in the roof when the ill-conceived plan. Shall not at the construction site just cut holes cut holes, holes waterproof to do!
6) section of color plates envelope too thin. After a period of use, the outer plate corrosion or affected by temperature increases the gap between the deformed plate.
(2), the construction elements
1) construction project to pay attention to protect the roof envelope, free to stampede roof, flat roof or even undermine the presentation crack sealant did not hit the volume, orientation is not in the correct place, Tarlac rivets too much and is not waterproofed deal with.
2) Gutter not be preserved. Gutter corrosion construction unit just some rust or asphalt paint brush, use for some time, gutter serious corrosion.
3) Steel plant roof span is too large due to the presence in many cases the roof overlapping process, although the use of overlapping, etc. 138 900 polyurethane sealant and staples and other processing equipment is often difficult to achieve the standard planning theory, lead to leaking.
4) there is no gutter lateral inclination. Leaving a certain slope should be made, at least 0.5%.
5) key node sloppy construction site. Parapet and other root without the required shade angle or circular arc made too small, closed head side coil end Mifengbuyan, catchy white metal deformation, coupled with scarce fixed-point data seal seal well. Roots protruding roof pipe plugging holes lax pipeline four weeks was up close to leveling layer no leveling layer, waterproof layer pan of water high enough. Insulation construction rain, exhaust ducts blocked vent unreasonable to form a long-term immersion insulation. Rigid roof cracks split seams and sew side wall waterproof sealant bond is not strong seepage.
(3) using the elements 1) Housing feel free to add them in the course of loading, causing roof deformation. Especially when the roof purlins free to add load, purlin deformation, resulting in roof water.
2) waterproof glue, sealant aging, use project lacked the necessary protection.
Leak-proof way
(1) should be strictly in accordance with specifications planners plan can not be arbitrarily decreased because of the cost savings plan target, planners should be more to the construction site, contact the practice of planning.
(2) planning should be made based on detailed and reasonable practice of a large sample of nodes, not just convenience, blindly applied on the node graph membership. Planners in the planning of the roof purlins when conservative should not blindly in order to save steel, while the drop height purlins. Purlin height a little higher, it is conducive to leak.
(3) should be better waterproof roof plate type. According to market research statistics, 760 Field composite panels, 475 color plates, 675 color plates, engaging at least 360 ° 180 °, almost no leakage phenomenon, although these types of plate means more trouble, but reflect with good effect.
Select (4) roofing materials, should use the quality of trust manufacturers. Since the properties of the metal roof of the data should be used for the metal plate roof waterproof materials; such as having high bond strength, good conformability, excellent weather resistance and butyl rubber adhesive sealing tape, as the metal roofing waterproofing supporting information.
(5) when the device works, site management should be strengthened to improve the quality of the team means the best steel manufacturers raised their own support team or the technical backbone, management backbone to curb power contractors.
