Disadvantages of existing roof waterproof construction in recent years

As one of the important components of the building, the roof plays an important role in waterproof and thermal insulation besides the structure. At present, the roof leakage rate of buildings in China is still high, although it is not ideal to reduce the roof leakage rate and improve the energy saving effect. So how many years will the roof be waterproof? What are the shortcomings of the existing roof waterproof construction? Let's have a look. As one of the important components of the building, the roof plays an important role in waterproof and thermal insulation besides the structure. At present, the roof leakage rate of buildings in China is still high, although it is not ideal to reduce the roof leakage rate and improve the energy saving effect. So how many years will the roof be waterproof? What are the shortcomings of the existing roof waterproof construction? Let's have a look.

How many years has the roof been waterproof?

1, the roof is the outer protective component of the upper building, which is used to resist the influence of unfavorable factors such as rain, snow, wind, frost, solar radiation and temperature change in nature, and ensure an excellent use environment inside the building. The roof should meet the functional requirements of firmness, durability, waterproof, thermal insulation, fire prevention and resistance to various adverse effects.

2, the roof should comply with? Reasonable fortification, combination of discharge and discharge, tailoring and comprehensive management? Policy, waterproof and drainage, maintain a normal indoor environment, from rain and snow corrosion.

3. Roof waterproofing and fortification requirements shall meet: 1, Ⅰ. Particularly important or having special requirements for waterproofing. The reasonable service life of waterproof layer is 25 years. The waterproof layer should be made of polymer waterproofing membrane, polymer modified asphalt waterproofing membrane, metal plate, polymer waterproof coating, fine stone concrete and other materials. The fortification requirements are waterproof fortification above Grade III. 2. For important buildings and high-rise buildings, the reasonable waterproof service life is 15 years. The waterproof layer should adopt polymer modified asphalt waterproofing membrane, polymer waterproofing membrane, metal plate, polymer waterproof coating, polymer modified asphalt waterproof coating, fine stone concrete, flat tile and linoleum tile, and the fortification requirement is secondary. 3. For general buildings, the reasonable service life of waterproof layer is 10 year. The waterproof layer should be made of three-felt and four-oil asphalt waterproofing membrane, polymer modified asphalt waterproofing membrane, polymer modified asphalt waterproofing membrane, metal plate, polymer modified asphalt waterproofing coating, polymer waterproofing coating, fine stone concrete, flat tile, linoleum tile and other materials. 4. Ⅳ For non-permanent buildings, the reasonable service life of the waterproof layer is 5 years, and the waterproof layer can be made of materials such as two-felt three-oil asphalt waterproof coiled material and polymer modified asphalt waterproof coating, and the fortification requirements are waterproof.

Disadvantages of existing roof waterproof structure:

1, concrete roof engineering, in addition to the waterproof layer and insulation layer, generally includes leveling layer, gas barrier, leveling layer, maintenance layer and surface layer. According to the different practices of roof waterproof layer and insulation layer, roof structures are generally divided into vertical and inverted types.

2. Upright roof, that is, roof structure with insulation layer under waterproof layer. Because the insulation layer is under the waterproof layer, traditional insulation materials, such as perlite, aerated concrete, ceramsite concrete, etc., are generally used, and these materials generally have the common problem of high water absorption. In the construction and application of waterproof layer, once it is damaged or the lap seal is not tight, water will quickly enter and be stored in the insulation layer. At this time, the thermal conductivity of thermal insulation materials will increase only after absorbing water, and the thermal insulation effect will decrease rapidly. What's more, because there is a lot of water in the insulation layer, it seeps into the room in the thinner part of the roof structure layer, and it is difficult to completely correct it. Setting an exhaust pipe in the insulation layer can sweep away the water vapor in the insulation layer, which can play a certain exhaust role. However, the exhaust pipe added on the roof is easy to be damaged, which not only does not play an ideal exhaust role, but constitutes a new water inlet channel.

3. In recent years, inverted roofing has been adopted in southern China, and the insulation layer is placed on the waterproof layer. It is necessary to choose hydrophobic thermal insulation materials, such as extruded board. , and set the maintenance layer such as fine stone concrete on the insulation layer. This method can prevent water from escaping from the insulation layer to some extent. However, because there is no waterproof layer on the insulation layer, water can easily enter the insulation layer and exist in the gaps of the insulation layer, such as slab joints, insulation boards and waterproof layers. On the one hand, the heat preservation effect is reduced. On the other hand, in winter, the curing layer and surface layer are cracked and damaged due to ice expansion, which affects the application of roof. Although the inverted roof waterproof layer is placed under the insulation layer, the traditional waterproof layer bonding process can not fully bond with the structural layer, resulting in water channeling between the waterproof layer and the structural layer, leading to leakage. In addition, the repair process is messy, and the structural layers such as insulation, maintenance and surface layer above the waterproof layer need to be completely removed, which is labor-intensive and laborious.

I'll say so much about the years of roof waterproofing and the disadvantages of existing roof waterproofing construction. Regardless of whether the roof is upright or inverted, in addition to the inherent shortcomings of the above-mentioned structural practices, various functional floors of the roof have failed to complete the functions required in the planning because of the chaotic roof structure levels, the site construction is greatly affected by human factors, and the layered construction between structural levels affects each other, even because of the matching problem between different construction units.