Roofing waterproof project is an important project in building construction. The engineering quality is related to the service life of buildings and directly affects people's normal production activities and life. According to statistics, the causes of roof leakage are as follows: materials account for 20~22%, design accounts for 18~26%, construction accounts for 45~48%, and management and maintenance accounts for 6~ 15%. At present, there are many new materials for roof waterproofing, but the coiled material waterproof layer still occupies an important position, so this paper expounds the quality control of roof waterproofing project from two aspects of design and construction.

Keywords: construction engineering; Roofing coil; Waterproof design; Construction measures

1, the main problems of roof waterproof engineering

Building leakage is a common quality problem in building engineering, which has attracted great attention of the state. In 2000, the "Regulations on Quality Management of Construction Projects" was implemented, requiring that roof waterproofing projects should not leak for five years.

The main reasons for these common failures are as follows:

1. 1 The quality of waterproof material does not meet the requirements.

At present, the basic situation of waterproof material market is still in a chaotic state. In particular, SBS modified asphalt waterproofing membrane, the leading product, suffered the greatest impact.

1.2 The design unit does not attach importance to waterproof design.

The material selection of waterproof layer should be designed by the designer in strict accordance with the specification requirements. But many designers are not familiar with the quality of waterproof materials, so it is necessary to use them.

Please consult and apply the construction atlas at will.

1.3 material and quality control consciousness is not strong.

In order to win the bid successfully, the construction unit often adopts the method of reducing the bid price. In this case, in order to make a profit, we can only use waterproof materials with lower prices, and do not follow the formal construction process, so the quality is difficult to guarantee.

1.4 The behavior of the construction unit is not standardized.

Construction units dominate the market. Most construction units first agree with fake and shoddy products and maliciously depress prices to reduce housing costs and seek profits; Second, regardless of the materials purchased by the construction unit, it did not play the responsibility of supervision and management.

2. Improve the quality of waterproof design

The design of roof waterproofing should meet the following requirements: 1) The roof should form a continuous and completely closed waterproof layer; 2) The waterproof layer will not be damaged or broken due to base cracking and joint movement; 3) The waterproof layer can withstand the aging caused by external factors such as climatic conditions.

In order to meet the above requirements, comprehensive measures should be taken from design, construction and maintenance.

2. 1 has clear design guiding ideology.

The design of waterproof layer should ensure no leakage within the specified service life, and the scheme selection should fully consider the regional conditions, material resources, construction reliability and problems that are easy to occur during use.

2.2 The overall structure should be considered when designing the waterproof layer.

Structural deformation will lead to cracking of waterproof layer. When the local foundation is deformed, the integrity of the roof waterproof layer is controlled by the superposition of settlement deformation and temperature difference deformation. If the total deformation exceeds the extension limit of waterproof layer, it will cause cracking and water leakage. Therefore, different foundations adopt different defensive measures to enhance the overall stiffness of the structure.

3, roofing waterproofing construction should do the following work.

3. 1 Technical preparation before construction

Before roof construction, the construction unit shall organize technical management personnel to jointly review the roof drawings, master the detailed structure and related technical requirements in the construction drawings, prepare the roof construction scheme according to the actual situation of the project, and make technical disclosure to the team.

3.2 Requirements for construction personnel and construction procedures

Waterproofing of roof engineering must be carried out by waterproof professional team, and self-inspection, self-inspection and self-correction of quality should be carried out according to the construction process and level, and construction records should be made.

3.3 Quality requirements of waterproof materials

Waterproof materials should be accompanied by factory inspection report and factory certificate after entering the site. The construction unit shall conduct re-inspection according to the witness sampling and sample delivery system. After re-inspection, the qualified sheet of the re-inspection test report can be used for waterproof engineering.

4. Ensure the quality requirements of roofing waterproof engineering.

4. 1 Construction environment

In order to ensure the construction operation and the quality of coil paving, the construction temperature should be+5℃ ~+35℃; Polymer modified asphalt and polymer waterproofing membrane should not be constructed at negative temperature, and hot-melt paving membrane can be constructed above-100℃. Rain, snow, frost, fog, excessive atmospheric humidity and windy weather are not suitable for construction.