Almost everywhere in Vietnamese house can be absorbed because the hot damp weather. The effect from environment mostly comes to weaks points of houses like structure and materials. Therefore, protecting house from absorbing must be cared from the process of design and raw preparation. Although in any drawing version of house has the part of damp-proof method, technology and effectiveness of that are not concerned carefully.
As we know that, the traditional houses of our fathers have sloping roof, so they did not have to pay more money for damp resistance. Because damp in house is a complex problem, which lasts for many years with different levels, so the best solution is the ways of "prevention". Besides the strict requirements of technique and materials, house owners should take care about concepts of usage and design from basic ideas of housing.
In details: The areas that use lot of water need being drier than other areas, which don't have many small pools of redundant water. The walls that touch directly to atmosphere should have methods of defense, such as a green wall with climbing plants and faucets. It protects walls from being immediately elastic when temperature changes. Users had not better placing obstacles on roof because it may block water from moving. Some house owners said that it is very good if caring about flat roof but it takes much time to implement. If not, it is available to place tile roof, which can combine heat proof, absorbing proof and rust proof. Some of flexible methods are having 2 layer floor with soil for planting, or lifting one more plastic floor with wooden fake to have more area of relaxing. In absorbing treatment, there are 50% of cases relate to sewerage pipes because their quality, erection methods, connections treatment... can affect to absorbing consequense.
Let's see the traditional house with sloping roof and our fathers didnot have to resist absorbing. Now, many villas learn this way to design roof for water to escape easily and directly to yard. Of course, water must not come to other houses or affect to itself by wind direction.
According to specialists, using gutter or seno will be always good and it is more suitable depending on real conditions. In reality, on balcony or roof, water often runs in the wrong way because there is not enough width in pipe's diameter, additionally, waste, rust filling up pipe's mouth.