Advantages and disadvantages of waterproof materials and waterproof coatings?

Nowadays, there are many kinds of waterproof materials. In flexible waterproof materials, according to the form of waterproof base attached to them, they can be roughly divided into two categories, namely, coil waterproofing and coating waterproofing. However, there is a key link in transforming waterproof materials into waterproof layers, that is, construction; That is, the secondary processing of waterproof materials.

Coil waterproofing and coating waterproofing have their own advantages and disadvantages. The choice should be considered according to the actual situation. How to choose waterproof materials and the problems that should be paid attention to in waterproof construction are as follows:

The earliest traditional waterproof coiled material should be regarded as paper tire linoleum. When using linoleum as waterproof layer, it must be bonded with building asphalt and covered with sand. The general practice is three oils and two felts or four oils and three felts. Due to the high labor intensity of the above methods, it is difficult to grasp the construction technology, and a large amount of waste gas is produced when preparing asphalt, which seriously pollutes the environment and cannot be constructed in places where fire cannot be used. It is prone to fire and scald accidents, and it is difficult to maintain the roof twice. For the above reasons,

A new generation of waterproof materials is developing in the direction of light weight, convenient construction, no environmental pollution, durability and beautiful color. Therefore, paper tire linoleum is used for waterproofing membrane; Rubber coil; Composite membrane modified asphalt coiled material; All kinds of synthetic polymer waterproof coiled materials; The waterproof coating material is modified emulsified asphalt; Plastic ointment; Polyurethane waterproof coating; Developing to environment-friendly synthetic polymer color waterproof coating.

So far, there are many kinds of waterproof materials. In short, the appearance and application of various waterproof materials have their own advantages, either easy to obtain materials, low cost, low price but durable, or different uses and waterproof occasions. In addition to cost, climate, region, building function and environmental protection, the structure of the building is an important factor in choosing waterproof materials. The place suitable for waterproofing membrane is not suitable for coating waterproofing, and the place suitable for coating membrane is not necessarily suitable for using membrane; The following occasions are not suitable for the use of coiled material waterproofing: wet base, parts with poor drainage or perennial water accumulation, uneven base, protruding embedded parts, back water surface waterproofing, water spraying waterproofing, areas with large typhoon level and many years; The following bases are not suitable for coating waterproof: the bottom waterproof of wooden sloping tile house, etc.

The advantages of coiled material waterproofing include: convenient construction, short construction period, no maintenance after molding, no influence of air temperature, little environmental pollution, easy to master the layer thickness according to the requirements of fortification scheme, accurate material calculation, convenient management on the construction site, difficult to cut corners, uniform layer thickness, and effective overcoming the stress of the base when paving (the whole waterproof layer can be maintained when there are large cracks in the base).

The disadvantages of waterproofing membrane are: in waterproofing construction, waterproofing membrane should be cut according to the shape of waterproof base, and the base with complex shape needs multiple pieces of splicing, and the overlapping parts of waterproofing membrane are difficult to bond, which affects the beauty of waterproof layer; Furthermore, complete and absolute sealing will become the main problem, and the biggest hidden danger and opportunity of water leakage is the lap joint of the coil; Furthermore, the high-grade waterproof coiled material is durable for decades, but there are few domestic supporting adhesives at present, and the waterproof failure will be self-evident due to factors such as the environment and the bonding material itself. Moreover, the protection of waterproofing membrane after construction and the maintenance after water leakage are also difficult problems. Exposed waterproof layer is very important to prevent external mechanical damage. Whether it is full paving, point paving, strip paving or empty paving, waterproofing membrane will be a continuous layer between the membrane and the base. No matter the penetration damage, degumming and glue leakage of any part (even if there is only one place), the whole waterproof function connected with it will be invalid. if

For those waterproof layers with concrete protective layer, although external mechanical puncture can no longer be carried out, such as along the ditch, it is not suitable for protective layer; Moreover, due to the blockage of sewers, there is a great possibility of long-term water accumulation along ditches and other parts, and there must be no defects in the watertightness of the waterproof layer during this period; Therefore, the probability of waterproofing along the ditch is small; Because of the complex shape of the ditch edge, it is difficult to seal the water tunnel, water outlet and other parts, and waterproofing of the coiled material has become the key technology. Due to the accumulation of domestic and production wastewater along the ditch, the harmful components in it accelerate the decomposition, aging and even failure of the coil.

To sum up, the disadvantage of coiled material waterproofing is not equal to its incurable disease, so we put forward and face it squarely and find a solution to the problem; Such as obtaining high-quality and durable adhesive to solve the problems of bond strength and bond aging, patiently constructing fine materials to overcome the problem of bond sealing, and adopting multi-channel fortification and composite use with coated waterproof layer to solve the problems of coil fear and reliability of waterproof layer; Then weigh the pros and cons. If it is really not suitable to use coiled material, boldly use waterproof coating instead.

Waterproof coating, waterproof coating is because some waterproof coatings are easy to construct, there are many manufacturers, the materials are easy to get, and the production equipment is relatively simple, so a waterproof material developed earlier has a long service life.

Waterproof coating can form an integral seamless sealing layer, which is completely waterproof, airtight and waterproof, and can completely isolate the invasion of external rain, moisture and all harmful gases on the waterproof base; The coating waterproof construction technology is easy to master, the construction equipment is simple, and it can be made into a continuous integral waterproof layer, which is not limited by any complicated base shape. Most waterproof coatings also penetrate into the closed pores of the base to strengthen the building, and some waterproof coatings can also be used as coiled material adhesives to play a dual role of waterproof bonding. However, in order to achieve the above effect, waterproof coating must have the guarantee of material and waterproof layer thickness; The polymer color waterproof coating developed at present can also be used as the surface decoration of various waterproof layers, and its color is Suiyi. At the same time, when it is old and wants to change its color, it can become a brand-new veneer by covering it once or twice (the dosage is not more than half a kilogram), and at the same time increase the thickness of the waterproof layer. At present, the polymer emulsion color waterproof coating on the market belongs to environmental protection waterproof material, which is non-flammable and non-toxic with water as solvent, and the production, construction and transportation of waterproof coating are very safe.

Another advantage of coating waterproofing is that it can be constructed with different thicknesses according to the fortification requirements of different parts of the base and the stress of the structure. In other words, the thick parts can be thick and the unnecessary parts can be thin, so that waterproof materials can be used economically.

The surface of coating waterproof layer is smooth and easy to clean, and some high-strength coating waterproof layers (such as JS waterproof layer based on cement) can be directly used as the main roof and ground; Because there is a 100% bonding surface between the coating waterproof layer and the base layer (except for the parts that are paved empty by avoiding pulling method at cracks and joints), most of them are not afraid of being pierced by sharp instruments, and some of them have self-healing functions, such as PVC cement, ointment and asphalt waterproof coating. The water leakage of the waterproof layer of the coating during its service life is mostly caused by the crack width of the base layer exceeding the extension range of the waterproof coating, and the causes and parts of the water leakage are easy to find, so its warranty is very convenient. No need to redo the waterproof layer.

High-quality waterproof coating can successfully waterproof the back water surface, which is far from being waterproof with coiled material. Some waterproof coatings can be constructed on wet foundation to form waterproof layer, and there are no other requirements for basement, hose, toilet and bathroom. And other waterproof base layers that cannot be dried due to urgent construction period, because any coiled material must be attached to the dry base layer.

In a sense, the product of coating waterproof layer is only paint, which can only be formed after being coated on the base and consolidated by the first-order physical and chemical reaction of the paint itself. Some waterproof coatings will release harmful gases during curing, which is harmful to human body. Some waterproof coatings need to be painted several times to complete a waterproof layer, and there should be a certain interval each time. Therefore, the final completion of the waterproof layer takes a long time (arbitrary to several days), and it will be affected by many unfavorable factors in the curing process, such as sudden rain, tight construction period, freezing, closed environment, difficult curing, some waterproof materials need hot melt construction, and open flames are not allowed in some occasions.

In the process of waterproof coating construction, site management is very important. Because of its easy access to materials, the production equipment of some waterproof materials is relatively simple, and the packaging preparation can be sloppy. Therefore, cutting corners and shoddy construction will make the thickness of the waterproof layer of the coating film take advantage of it, which has always been the key to waterproof effect and durability. However, the thickness of waterproof coating is not as intuitive, uniform and controllable as that of coiled material, and its thickness depends on the number of brushing times during construction. Except for cold-set waterproof coating, which generally contains no solvent and has high solid content, it can reach the thickness by single coating. Solvent-based waterproof coatings need to be film-formed and consolidated after solvent volatilization, and often need to be painted several times to reach the design thickness. The last coat should not be painted before the lower layer is wet.

To sum up, coiled material waterproofing and coating waterproofing have their own advantages and disadvantages. If you choose the right combination, you can foster strengths and avoid weaknesses, complement each other's advantages, and achieve the best waterproof effect with re-economic investment. Otherwise, if we blindly adopt them, it will be counterproductive.

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