Analysis of water leakage in color steel plate roofing system caused by construction factors

Lightweight steel structure roofs are roughly of various types according to the materials used, such as color steel plate, colored steel sandwich panels, colorful linoleum tiles various lightweight roofing panels, metal arch corrugated roofing, composite steel decks and so on. There are two kinds of roofing panels in the roof of steel structure system: longitudinal connection and lateral connection. Longitudinal connection is mainly lap, that is, the upper slope plate pressure lower slope plate, lap set up special waterproof sealant plus fixed special pressure strip, and lateral connection of the following three ways: lap connection, concealed buckle connection, bite concealed buckle connection Generally speaking, at present, The steel roof leakage phenomenon is mainly concentrated in the color steel plate interface lap, gutter on both sides. Lighting window around and wall connection part and so on.

Water leakage analysis of color steel plate roofing system is caused by many factors, among which water leakage caused by construction reasons accounts for a large proportion.

Roof fasteners out of water leakage

Because in the construction process, tapping force is too heavy or too light, self-tapping wire playing bias or playing oblique, etc. may lead to self-tapping wire rubber gasket at the deformation, fall off to form a concave surface, which in turn causes the roof leakage and through the thermal insulation cotton aggregation in order to form a point of water leakage. In addition, the self-tapping wire position is not correct, miss the rubber strip under the color steel plate and directly form a hole is also the cause of water leakage.

Water leakage at the overlap of color steel plates

Two panels lap not tight or length is not enough, as well as self-tapping wire is not full to form a gap, resulting in lateral lap water leakage. The color steel plate tile corrugation is too low or the engagement is less than 360 degrees. When a large amount of rainwater does not pass through the tile corrugation, it is easy to cause large-scale water leakage and make it difficult for people to detect the leakage point.

Leakage at the ridge

The ridge at the crest is too high, the ridge cover can not guarantee the waterproof; longitudinal lap does not put mastic or silica gel, the formation of gaps and leaks: ridge cover longitudinal lap with rivets, thermal expansion and contraction of the strength is not enough to pull off the rivets, the formation of leaks; ridge cover and roof panels are not laid between the plug, or plug placed in an irregularity and fall off to form a water leak.

Water leakage from lighting panel

Water leakage from lighting panel waterproofing is an important part of the maintenance system waterproofing, light panel installation of mastic laying, waterproofing screws is the main hidden trouble of roof leakage; The lighting panel type does not match the roof panel type, light panel on both sides of the crest is higher than the roof panel, after the installation, sealing the formation of light panel inside and outside of the air pressure difference, capillary water leakage from the light panel on both sides of the gap into the interior of the roof; light panel vertical lap length is not enough and the aging of mastic loss of adhesion to the vertical lap length is not enough. The longitudinal lap length of the lighting panel is not enough, and the adhesive clay is aging and losing adhesive longitudinal adhesive clay falling off: the rigid lap joint between the lighting panel and the color steel plate, and the gap in the middle of the panel is not sealed.

Water leaks from the fan opening

Fan openings are not according to the design node for waterproof treatment steel plug placed without laying waterproof mastic and silica gel; fan openings around the reserved range is small, rainwater flow is not smooth, easy to accumulate water; open holes around the edges of the lap is not waterproof treatment; open holes around the interior is not added around the structural components, the formation of low-relief water; 6 roof panel installation without the addition of structural elements, the formation of low relief.

Water leakage from end of roof exterior panel

Roof exterior panels installed without foam plugs, roof external plate is not under the spanner; wall external plate length is insufficient, and the gable part is not waterproof edging.

Water leaking from the gutter

Due to the steel plate gutter is relatively thin, weld seams are prone to problems, and the gutter is not anticorrosive, after a period of use, corrosion is serious.

When we discover the cause of roof leakage, we can pay targeted attention during the construction process.