With the continuous development and progress of social economy, architecture is more and more in pursuit of external beauty, which needs complex external wall decoration to reflect, and the deepening of external wall decoration lines, paint and stone is more and more essential
.
The deepened exterior wall drawings can greatly improve the convenience and accuracy of budget and construction
.
If you need to deepen, please scan the QR code below and contact the studio engineer on wechat
.
How to deepen the design cost process of exterior wall insulation line coating stone curtain wall engineering is here! Taobao platform announced that the exterior wall decoration materials of Xinming design studio mainly include stone, glass, metal plate (curtain wall), facing brick and coating
.
Due to the good decoration effect of stone and curtain wall, but the high cost, it is the first choice for commercial and office buildings, while facing brick and coating are often selected for residential buildings based on cost considerations
.
In recent years, the cracking and even falling off of building exterior wall facing bricks have occurred from time to time, which prompted high-rise buildings to use paint facing
.
The coatings are mainly used in elastic coatings
.
The elastic coatings are made of synthetic resin emulsions, which are made of pigment, fillers and auxiliaries
.
After coating on the outer wall, the film has a certain thickness
.
It is an elastic functional coating which can be used to produce small cracks due to the stretching (movement) of the substrate
.
Due to the high elasticity of the elastic exterior wall paint film, when cracks appear in the wall, the film can withstand tensile deformation without cracking, which has a shielding effect on the cracks, and maintains a complete film and plays a variety of barrier functions to continuously protect the wall insulation system
.
1
.
Structure composition and function of external thermal insulation system of external wall the common external thermal insulation system of external wall includes four types: paste type, spray type, cast-in-place type and integration of thermal insulation and decoration
.
At present, the paste type is more common in North China
.
The insulation layer and facing layer are pasted onto the base wall by using mortar materials such as adhesive and plastering mortar
.
The structure of pasted thermal insulation system is generally composed of base wall, leveling layer, adhesive layer, thermal insulation layer, plastering layer and coating finishing layer, as shown in Figure 1
.
Adhesive and plastering glue play a bonding role, but each layer structure in the system will affect the integrity of the coating finish layer, such as uneven base wall, grid cloth cracking, cracks between thermal insulation materials and so on, which will cause the cracking of the exterior wall coating and bring hidden dangers to the thermal insulation system engineering
.
This paper briefly analyzes the function of each structural layer in the adhesive insulation system
.
1
.
Flat layer: wall filling, leveling, slope making or wall reinforcement; 2
.
Bonding layer: the bonding effect of base wall and insulation layer; 3
.
Insulation layer: improve the thermal insulation performance of building envelope, reduce building energy consumption; 4
.
Plastering layer: protect the insulation layer from wind, rain and harmful impurities, improve moisture-proof, corrosion, weathering resistance, increase durability, and make the building more comfortable 5
.
Facing layer: it is generally composed of flexible putty and paint, with a variety of different building facade decoration methods, to enhance the beauty of building facade modeling and effectively reduce the dust deposition on the building surface
.
Xinming design studio exterior wall deepening design case show: Zhejiang Province some exterior wall coating engineering interface deepening design — Architectural thermal insulation decoration engineering EPS line coating real stone paint water in sand drawing deepening design effect drawing construction completion drawing Hunan Province some project exterior wall coating engineering interface deepening construction drawing design — Architectural thermal insulation decoration engineering EPS line coating real stone paint water in sand drawing deepening design Detailed design of exterior wall thermal insulation line interface drawing of a project in Tianjin detailed design of EPS line coating stone like paint water in sand drawing of building thermal insulation decoration engineering detailed design of partition joint effect drawing / construction drawing / as built drawing of exterior wall thermal insulation interface drawing of a project in Hebei Province detailed design of EPS line coating stone like paint water in sand drawing of building thermal insulation decoration engineering Detailed design of a curtain wall engineering drawing in Suzhou — detailed design of EPS line coating real stone paint water in water sand drawing for building thermal insulation decoration engineering detailed design of sub grid and joint effect drawing / construction drawing / as built drawing detailed design of real stone paint for external wall thermal insulation line of a project in Zhengzhou, Henan — detailed design of EPS line coating drawing for building thermal insulation decoration engineering detailed design of sub grid and joint Effect drawing / construction drawing / as built drawing ﹣ 2 the function of coating facing layer of building exterior wall coating mainly has four functions: the first is the decorative function, improving the appearance aesthetic feeling of the building, improving the artistic effect of the project; the second is the function of protecting the thermal insulation system, preventing the infiltration of moisture and rain, reducing or preventing the mildew of exterior wall and interior wall, enhancing the weatherability of exterior wall, reducing the influence of freeze-thaw cycle on thermal insulation The damage of the system, especially the influence on the bonding strength of the bonding mortar and the plastering mortar, so as to extend the service life of the construction project; the third is the function of anti ultraviolet radiation, which requires long-time irradiation without discoloration; the fourth is the stain resistance, the high-quality exterior wall coating has self-cleaning property, the paint film is hard and flat, and the dirt is completely new after being washed by water
.
In the natural environment, the coating has long been subjected to the test of cold and hot cycle, sunlight exposure, wind and rain, acid and alkali erosion, etc
.
the cracking phenomenon of the coating facing layer is more common
.
The main harm is that the water penetration will damage the thermal insulation system, affect the service life of the project, and also damage the beauty of the building
.
There are many reasons for the cracking of the coating facing layer of the external wall external thermal insulation system
.
Structurally, each structural layer of the thermal insulation system will cause the cracking of the coating; in materials, the poor quality of ordinary coating and stone paint or the construction not according to the requirements will cause the cracking; in use, if the thermal insulation system seeps, it will also crack after several freeze-thaw cycles From the field construction situation, if the construction is not carried out according to the requirements or the maintenance is not in place, it is easy to cause hollowing and cracking of the coating facing layer
.
The causes of coating cracking can be divided into two categories: one is the structural layer, the other is the construction quality
.
3.1 influence of structural layer (1) in the field construction of the base wall, in order to save time and reduce cost, the construction unit will reduce the treatment of the base wall or the treatment of the base wall is not in place, resulting in uneven and cracking of the wall
.
It can be seen from Figure 2 that there is a large gap between the concrete and the block wall after the thermal insulation layer is removed: Figure 2 (a) shows that there is a large gap between the concrete and the block wall, and the leveling layer is not in place, but a layer of grid cloth is simply covered on the outside of the gap, which is smoothed with mortar and not completely covered; Figure 2 (b) shows that the treatment between the concrete and the block wall is in place, but there is a drop of about 20 mm between the concrete and the block wall
.
These two situations will not only cause the adhesive and the base wall paste is not solid, but also cause the insulation board hollowing, facing layer cracking
.
(2) The gap between insulation boards in the adhesive insulation system, if the gap between insulation boards is too large or the insulation board and the base wall are not pasted solidly, even if the grid cloth is used, the damage of the gap to the facing layer can not be removed
.
As can be seen from Figure 3, figure 3 (a) shows that there is a large gap between the insulation boards, and figure 3 (b) shows that the insulation board and the wall are not pasted solidly
.
(3) In the external wall external insulation system, the grid cloth can prevent the cracks between the base wall and the insulation board from extending outward, reduce or even eliminate the outward expansion of internal stress, and effectively reduce the cracks in the wall, corner and other parts
.
It can be seen from Fig
.
4 that the grid cloth has a neat section when the cracked exterior wall is removed, which is also the reason for the cracks in the exterior wall; FIG
.
5 shows that in the insulation system without grid cloth, the coating cracks directly along the gap of the insulation board, which shows that the grid cloth plays a very important role in the insulation system
.
(4) The cracks of windows and corners are easy to occur in the parts with large stress such as windows, internal corners and external corners, as shown in Figure 6
.
Even if these parts are treated with interface treatment, it is difficult to avoid the occurrence of cracks, which is easy to cause rainwater infiltration.
.