Jiangmen steel building due to the current technology still in the exploratory stage of development and market competitive reasons, after an investigation has completed construction of steel buildings and steel building built in Jiangmen there are different levels of use after water leakage into the roof, roof It has become a common problem of water leakage quality steel construction.

1 Jiangmen steel roof form
    Building roof as a load-bearing structure of the building envelope and the top, and the role of its envelope surface design is critical to the whole building, light steel structure is an important part of the containment system most prone to leaking. Its main role is to be able to resist the invasion of wind and solar radiation, rain, snow, and bear the weight of the roof and the roof of the wind, the snow and the Master load [1]. Lightweight steel roof according to the materials generally have many types of color pressure plate, color steel sandwich panel, colorful shingles, various light roof, GRC board, arched corrugated metal roofing, composite pressure plate [2 ], light steel roof and wall materials are mainly chosen color pressure plate or sandwich. Link color of both the pressure plate 3600 bead board, dark pinch lap joint, also nailing boards. Purlin is lighter weight thin-walled C or Z purlin, roof slope design is generally 1/10 to 1/15.

2 roof connection
   Steel construction roof system on the roof and has a long connection to the lateral connecting the two. Long connected mainly to overlap, ie pressure plate uphill downhill boards, lap set special waterproof sealant plus fixed dedicated layering, and the way the lateral connection present, there are three types: 2.1 tongue and groove connection; dark 2.2 button connection; 2.3 dark button snap connection;

3 Jiangmen steel roof leaks solutions
   Leaking roof maintenance system according to the site boils down mainly as follows:
  3.1 parts of the roof: the leaking portion of the main reasons are: too high at a ridge crest, waterproof roof cover can not be guaranteed; longitudinal lap and hold clay or silica to form a gap and leakage; roof cover longitudinal lap rivet connection, hot expansion and shrink strength is not enough to pull off the rivets, the formation of leaks; roof ridge between the cover and not the laying of plug, or plug off the formation norms placed not leaking. The solution is: do more wide roof cover, in addition to find a large slope point; lap laying clay or silica; replace the staple; plug plate and the plate should match the plug should be laid on the decentralization of mastic or silicone.
   3.2 Gas floor roof site: This site is mainly due to water leakage: Gas floor and roof junction income side is not placed under the foam plug, and the income side of the longitudinal lap not laying clay or silica; roof outer panel in a gas floor junction is not the upper plate; opening gas strut structure building site without making water treatment; gas production floor itself, install water leakage problems. The solution is: foam plugs should be laid before income side installation, longitudinal lap or cement plug shall be provided with the staple fixed; you must pull on the floor, roof, front air installation; after completion of the construction side in the gas requirements of gas House floor structure drilled holes must be waterproofed; installation of air quality waterproof floor and be inspected.
   3.3 parts lighting board: lighting plate board type does not match with the roof plate, lighting board on both sides of the crest above the roof, after installation, the seal is formed over the strict board lighting inside and outside air pressure difference, capillary water from the roof into the both sides of the slit lighting board internal leakage; lighting board longitudinal lap length is not enough, and the clay aging lose their stickiness; longitudinal clay off; between the light color steel plate and rigid lap, the gap between the unsealed. Roof lighting board to prevent leakage should note the following: waterproof screw Shi hit the upper part of the crest; the income side of the plate at the lighting board with lighting board should be firmly sealed, to widen the longitudinal sides of clay, and the laying of the upper part of the peak, preventing the penetration of water into the capillary .
   3.4 Roof openings site: This site is mainly due to water leakage: Hole design node fails waterproofing, laying steel plug is placed not waterproof clay and silica; four weeks set aside a small opening range, poor rainwater flowing easily water; opening lap four weeks edging not waterproofed; openings around the inside not add structure to form a low-lying water; water blocking phenomenon exists waterproof construction, the formation of water. The solution is: according to design drawings and construction of strict construction process, laying clay, silica gel; opening four weeks reserved range must meet the drainage requirements; water treatment must be followed by the walls, the roof opening; after opening the envelope as far as possible to increase additional purlins or angle steel, reducing envelope distortion; waterproof construction and installation must be tight, smooth, smooth water flow.

   3.5 cornice parts: a major source of the leakage problem, which is mainly due to leaking parts: the outer roof panel installation not add foam plug, not under the roof outer panel pull; insufficient wall outer panel length, and not add water to close parts of the cornice side. The solution is: the roof outer panel should be installed at the same time placing the foam plug, and will pull down the roof outer panel 30 degrees; eaves design requirements should be additional revenue side.
   3.6 Gutter site: This site is mainly due to water leakage: welded joints exist within the gutter gap formed seepage; gutters and rainwater pipe diameter design is too small, does not match the plant slope length; gutter ends do not head board ; inadequate roof outer plate extends into the gutter length, the water will pour into the interior plant. The solution is: appropriate to increase the depth of the gutter, so that no more than rain gutter lap joint.
   3.7 brick wall with light steel roof joints: This site is easy to form leakage risks, cement walls and roof junction leakage, mainly due to the stress caused by the silicone rubber is not synchronized with the adhesive surface cracking and leaking. Solution: To prevent deformation temperature, using twice the income side of the connection processing; connecting with brick walls, the income side should be angled and completely sealed; the income side should pre-fight between the sealant.