Polyurethane spray exterior wall insulation construction process?

Polyurethane spray exterior wall insulation construction process is very important, only to understand the construction process in order to achieve the desired results in the construction, each link is very critical to deal with. Zhongda consulting on polyurethane spraying exterior wall insulation construction process and you introduce.

Polyurethane rigid foam roofing, exterior wall waterproofing and thermal insulation integrated system after the roof of the building structure, roof insulation and waterproofing is a very important project. The traditional practice of insulation and waterproofing are two systems, each for construction, the superposition of the two materials constitute the roof waterproof insulation system. In the actual construction project, due to a variety of factors, there are often some quality problems, resulting in damage to the building, thus destroying the roof waterproof insulation system.

The usual thermal insulation materials are not water-resistant, and their thermal insulation performance decreases with the increase of water content to the loss of thermal insulation function. General thermal insulation materials to provide thermal conductivity and other indicators, are close to the dry density or laboratory state parameters, but in the actual application, the moisture increases by 1%, its thermal conductivity will rise by 5%, that is, when the moisture content reaches 20%, the thermal conductivity doubled, the thermal insulation performance declined substantially. Containing more moisture in the insulation layer, due to temperature changes and freezing and thawing, the impact on the building and waterproofing layer is extremely unfavorable. Waterproof material performance in addition to the material itself, but also test the construction process is reasonable and quality, especially coil, sheet, the need for the finished product through bonding, welding and other methods of laying on the roof, each bonding and lapping points must be reliable, otherwise there will be leakage. Not only lose the role of the waterproof layer, but also lead to the failure of the insulation layer.

How to correctly design the roof insulation and waterproofing system, the appropriate use of materials, and reliably ensure the quality of construction? For this reason, polyurethane rigid body waterproofing and thermal insulation integration system, the application of polyurethane rigid body waterproofing and thermal insulation integration material, through professional equipment, on-site spraying to form a multi-functional sealing shell with waterproofing and thermal insulation, to complete the function of the roofing system. Polyurethane rigid body waterproof and heat preservation integration material has a lot of unique performance, mainly:

1. multi-functional integration. It is a set of waterproofing, thermal insulation multifunctional as one of the field spraying rigid foam body material.

2. Reliable waterproof performance. It has a high rate of closed cell, more than 95%, after the construction of the roof to form a seamless continuous shell, the thickness of the hard foam layer can fully meet the requirements of the design specifications, with strong resistance to rain and snow water penetration ability, waterproofing quality assurance period of twenty years.

3. High efficiency of heat preservation and energy saving. Its density ≥ 55 kg / cubic meter, the thermal conductivity of only 0.022 watts / m . Card, its energy-saving effect is significantly better than conventional heat preservation and insulation materials, the waterproof and heat preservation integration function of its materials can be eliminated from the current building design used in the insulation layer. The use of rigid foam polyurethane materials, 25 mm thick in Beijing can reach the national JGJ26-95 "civil building energy-saving design standards" stipulated in the energy-saving 50% requirements, 40 mm thickness can reach the energy-saving 65% requirements, and can make up for the deformation due to thermal expansion and contraction, bringing long-term energy-saving benefits to the owners.

4. Strong bonding force. It has good adhesion with concrete, metal, wood and other substrates. (The bonding strength with concrete slab reaches 0.52 MPa)

5. Light load. After the construction of polyurethane rigid foam body weight per square meter is only about 2 kilograms (thickness of 30 ~ 40 mm), greatly reducing the building load, especially for high-rise buildings and light large-span grid structure building.

6. Construction is fast and easy. Spray construction 5 minutes after curing, 20 minutes to walk on people, generally a set of equipment can be sprayed 500 to 1000 cubic meters per day. The unique construction method simplifies the construction process of the roof as a whole, especially the shaped parts are extremely easy to construct.

7. High compressive strength. Compressive strength of the hard foam material > 0.3 MPa, measured up to 0.4 MPa or more, fully adaptable to the requirements of the roof.

8. Fluorine-free environmental protection. The use of non-fluorine foam technology, non-toxic, non-polluting, environmentally friendly materials.

9. Reliable performance, adaptability. Adapt to the ambient temperature of -50 ℃ ~ +150 ℃, flame retardant, and resistant to weak acids, weak alkalis, vegetable oils and mineral oils and industrial waste gas and other chemical substances, erosion. 10. long service life, easy maintenance. According to statistics, the actual durability of building roofs using Alipolyurethane hard foam has reached more than 30 years, and maintenance is simple and convenient.

According to incomplete statistics, China's annual waterproofing project volume of about 600 million square meters, the vast majority of the project roof energy-saving is not up to standard, the relevant aspects of the state proposed that, by 2010, the country's total energy consumption of the towns and cities to basically achieve 50% energy-saving, the target of large cities to achieve energy-saving 65%. In particular, the energy-saving transformation of the original building, the need for simpler processes, the least generation of construction waste, longer service life and better technical and economic results, these are for the promotion of rigid foam polyurethane waterproofing and thermal insulation integrated roofing system provides an opportunity.

Construction of a conservation-oriented society and the development of a circular economy and the building materials industry is closely related to the roofing energy saving is to build environmentally friendly energy-saving buildings an important part of the rigid polyurethane waterproofing and thermal insulation integrated roofing system in the new situation has a good prospect for development.

Spray polyurethane rigid foam exterior wall insulation system, pouring polyurethane rigid foam exterior wall insulation system, paste polyurethane rigid foam exterior wall insulation system, external polyurethane rigid foam exterior wall insulation system construction process and characteristics

Exterior wall insulation technology first originated in Europe and the United States, China began to pilot in the middle of the 80s of the twentieth century, China's current level of energy saving in buildings is far lower than that of Europe and the United States and other developed countries. China's energy consumption per unit of floor area is 3-5 times more than that of developed countries with similar climatic conditions, and building energy conservation is an important issue in China's construction industry. Civil buildings in China's construction industry occupies a considerable proportion of the walls and windows and doors in civil buildings account for more than 80% of energy consumption [1].

At present, a large number of domestic thermal insulation materials, not yet reached the relevant national regulations. Some even to meet the requirements, and there are complex construction, comprehensive cost and other unfavorable factors. At present, the domestic market is in urgent need of a new type of insulation materials with convenient construction, not high cost, comprehensive

Good performance, thermal insulation effect is obvious. With the building energy-saving indicators increased to 65%, polyurethane rigid body efficient thermal insulation materials and composite insulation technology to an important position.

1. External wall thermal insulation and heat preservation technology

1.1 external wall insulation

External wall insulation is placed on the inner side of the external wall body, the advantage is: the insulation material of the water, marble resistance and other requirements are not high, energy-saving renovation of existing buildings, especially at present the house is sold to the individual, on the whole building or the whole district unified transformation has a mission difficult, a single household using internal heat insulation To be more convenient. Can meet the first stage of building energy efficiency 30% requirements. However, the external wall internal heat preservation exposed some defects, so that the application of external wall internal heat preservation is limited.

The exterior wall insulation finish layer is easy to crack, ring beams, structural columns caused by thermal bridging heat loss, resulting in condensation mold phenomenon. It is not convenient for users to renovate the second time, occupying indoor space. With the second phase of China's building energy saving 50% and the third phase of 65% of the external wall insulation requirements of the further increase, especially the existing building energy-saving renovation mentioned in the agenda, the internal insulation of the external wall is limited.

1.2 Outer wall sandwich insulation

Outer wall sandwich insulation is placed between the insulation material on the same outer wall of the inner and outer leaf wall piece. Its advantage is the performance of insulation materials, construction season and construction conditions are not high, does not affect the winter construction. The disadvantage is that there should be a connection between the inner and outer leaf wall, the structure is more complex, more thermal bridges in the external enclosure structure, the efficiency of the insulation material is not enough to play.

1.3 inside and outside mixed thermal insulation

In the construction process, the construction of convenient parts of the external thermal insulation using external thermal insulation, while the construction of external thermal insulation is not convenient parts of the internal thermal insulation. For this local internal insulation and local external insulation mixed use of insulation, so that the whole building of the main body of the external wall of different parts of the deformation rate and deformation of different sizes, so that the building is in a more unstable environment, a few years after the temperature difference between the structural deformation of the cracks, thus shortening the life of the whole building, mixed thermal insulation to the building caused serious damage, so do not advocate the use of internal and external wall mixed thermal insulation.

1.4 exterior wall insulation

Exterior wall insulation and exterior wall insulation and sandwich insulation compared with seven advantages

a. Protection of the main structure, extend the life of the building

As the insulation layer placed on the outside of the building envelope, buffer the temperature change caused by structural deformation of the stress, to avoid rain, snow, freezing and thawing, wet and dry cycle Structural damage caused by rain, snow, freezing and thawing, dry and wet cycle, reducing the harmful gases in the air and ultraviolet erosion of the enclosure structure, external insulation can effectively improve the service life of the external wall structure, reducing the cost of long-term maintenance.

b. Basic elimination of the impact of "thermal bridge"

"Thermal bridge" refers to the formation of heat dissipation channels at the junction of the inner and outer walls, structural columns, frame beams, door and window openings.

c. Moisture in the wall can be improved without the need to set up a vapor barrier

Internal heat preservation needs to set up a vapor barrier, while the use of external heat preservation, due to the high permeability of the main structure is on the inside of the heat preservation layer, the main wall will not occur in general condensation phenomenon, so there is no need to set up a vapor barrier. After taking external insulation measures, the structural layer of the whole

The temperature of the wall is increased, the relative reduction of the moisture content of the wall, which improves the thermal insulation performance of the wall.

d. Room temperature stabilization

Exterior insulated walls due to the greater heat storage capacity of the structural layer on the inside of the wall, when the indoor air temperature rises or falls due to the structural layer of the wall is able to absorb and release of heat is conducive to the stabilization of indoor temperature.

e. Facilitate energy-saving renovation of existing buildings

The energy-saving renovation of old buildings with exterior insulation, without temporary relocation, basically does not interfere with the normal indoor life of residential users, but also facilitates the enrichment and beautification of the exterior finish.

f. No damage to the thermal insulation layer during the second renovation

g. Increase the area of housing

2. Spray polyurethane rigid foam exterior insulation system

1 Scope of application

a. The system is suitable for the need of winter thermal insulation in summer, the multi-storey and medium-high level of the new civil buildings, industrial buildings and the energy-saving renovation of the existing buildings, external insulation projects. The system is suitable for new civil buildings of multi-storey and middle-high floor which need heat preservation in winter and heat insulation in summer, industrial buildings and energy-saving renovation of existing buildings.

b.The system is applicable to buildings with seismic cracking degree less than or equal to 8 degrees.

c. The system is applicable to the base wall which is concrete wall or various types of masonry wall.

2 system structure

Site spraying polyurethane hard foam exterior insulation system, according to the different finishing layer, can be divided into paint finishing system and brick finishing system. Its basic structure is: polyurethane moisture primer, spray polyurethane foam insulation layer, interface mortar layer, crack-resistant polymer mortar composite alkali-resistant fiberglass mesh cloth protection layer, scraping and coating crack-resistant flexible putty, brushing finish coatings (for the paint finish system). Or anti-cracking polymer mortar composite hot-dip galvanized welded wire mesh, expansion anchor bolts fixed anti-cracking protective layer, brick veneer (for brick veneer system).

3 construction points and notes

3.1 spray polyurethane hard foam exterior insulation should be completely effective thermal insulation system, thermal bridge parts, such as, door and window openings, floating windows, daughter wall, eaves, balconies and other parts should be strengthened insulation, not easy to spray polyurethane hard foam parts should be smeared thermal insulation mortar or paste polyurethane blocks, in the polyurethane hard foam spraying before the construction is completed.

3.2 The grass-roots wall should meet the requirements of "Code for Quality Acceptance of Concrete Structural Engineering Construction" GB50204-2002 and "Code for Quality Acceptance of Masonry Engineering Construction" GB50203-2002. The flatness error of the grass-roots wall should not

be more than 3mm, otherwise the grass-roots wall should be leveled first before spraying construction work. In order to ensure the effective bonding of polyurethane hard foam with the grass-roots wall, the grass-roots wall should be sufficiently dry, the moisture content is less than 8%, and the grass-roots wall should be interface treatment.

3.3 Construction basket or special scaffolding should be firmly erected, scaffolding horizontal and vertical poles from the wall surface, wall corners should be moderate, scaffolding boards laid with the outer wall compartmentalization compatible. Spray gun distance from the wall being sprayed and spray gun moving speed should be appropriate.

3.4 spraying environment temperature should not be less than 10 ℃, the wind should not be greater than 5, wind speed should not be greater than 10M / S, rainy days shall not be construction. If the construction of the rainy season should be made to prevent rain measures.

4 spraying construction procedures

Basic level treatment --- sweeping dust, remove loose parts --- cement mortar leveling --- painting polyurethane moisture primer --- spraying polyurethane foam --- painting interface mortar --- anti-cracking polymer mortar or thermal insulation mortar to find --- flat protective layer and finish layer

6 spraying polyurethane foam advantages and disadvantages

6 spraying polyurethane foam advantages and disadvantages

6 spraying polyurethane foam advantages and disadvantages

6 spraying polyurethane foam advantages and disadvantages

Spray polyurethane rigid foam construction by environmental conditions, winter temperature is low when not easy to construction, rainy days can not be constructed, the wind shall not be greater than 5, the wind speed should not be greater than 10m/s, spraying the construction process of the foam splash, due to manual operation of the spray gun, the gunner requires a high level of technical skills, otherwise it is not easy to spraying leveling. But spray polyurethane rigid foam body has obvious advantages:

6.1 Good thermal insulation effect

Spray polyurethane rigid foam body and the wall to form a continuous insulation layer without gaps and cavities, can effectively block off the "thermal bridge". Moreover, the thermal conductivity of polyurethane rigid foam is low 0.016~0.025w/(m.k), which is better than other insulation materials such as EPS, XPS, etc. The thermal conductivity of polyurethane rigid foam is 0.016~0.025w/(m.k).

6.2 Mechanical stability

Because the spray polyurethane rigid foam is an excellent bonding material, and the grass-roots wall is firmly combined, so it can resist the effects of unfavorable factors, that is, the most unfavorable conditions of temperature and humidity in the local conditions to withstand the wind, self-weight and normal impact and other internal and external combination of loads, polyurethane thermal insulation is still not drumming with the grass-roots level, separation and stability under humid conditions. Moisture state to maintain stability.

6.3 Excellent anti-humidity and heat performance

a. Wet tightness, spray polyurethane rigid foam body is composed of multi-layer, there is a dense skin film between each layer, and polyurethane rigid foam body is closed-cell structure, the rate of closed-cell is as high as 95% or more, so the spray polyurethane rigid body has excellent waterproofing, vapor barrier performance, and does not absorb water, and can block the water and water vapor infiltration, so the wall to maintain a good and stable heat insulation state, and the wall can be used in a variety of ways. Good and stable adiabatic state, which is currently difficult to achieve other insulation materials. Polyurethane rigid foam body exterior wall insulation wall surface without joints, holes, perimeter sealing, with good waterproof performance, to avoid rainwater into the system inside, causing harm.

b. There is no condensation inside the wall. During the drying process of the new wall or in winter conditions, when water vapor migrates to the outdoor area due to the high indoor temperature, there is no condensation inside the wall due to the barrier of the polyurethane rigid foam body.

c. It can withstand the harshest local weather changes, no matter high temperature or cold weather, it will not cause irreversible damage and deformation of the heat preservation system, thus avoiding the surface deformation caused by the change of temperature on the surface of the external wall, and avoiding the generation of surface cracks

The surface cracks will be avoided.

6.4 Excellent impact resistance

Sprayed polyurethane rigid foam is a kind of material with high strength ratio (the ratio of material strength to bulk density), which has strong resistance to external forces compared with other thermal insulation materials.

6.5 Strong adaptability to the deformation of the main structure of the wall, good crack resistance. Sprayed polyurethane rigid foam body is a flexible deformation amount of material, it is strong resistance to external deformation ability. It is not easy to produce cracks under the action of external force, temperature deformation, dry and wet deformation, etc., which can effectively ensure the stability and durability of the system. Polyurethane rigid foam attached to the main wall structure deformation, such as, contraction, expansion, etc., spray polyurethane rigid foam exterior insulation system, in line with the principle of layer by layer flexible gradient, layer by layer stress release. Polyurethane rigid foam and the main wall structure, reinforced concrete with a similar coefficient of linear expansion, and thus will not produce cracks or detachment.

6.6 Long service life, good durability

Sprayed polyurethane hard foam exterior wall insulation system in the composition of the system of the various layers of materials, with chemical and physical stability, compatible with each other, and synergistic. Can achieve in the structure of life, due to dryness, humidity, electrochemical corrosion and insects, fungi, algae or rodent damage and other kinds of attacks are not easy to cause damage, can achieve the requirements of the use of 25 years.

6.7 has good construction performance

Spray polyurethane rigid foam construction is a high-pressure foaming machine mechanized operations, construction speed, high efficiency, is incomparable to other foam body insulation construction. Spray polyurethane hard foam on the building shape adaptability, especially adapted to the building

Structural nodes of complex parts of the building, such as, outside the window, tiger window, deformation joints, stairwells, and other complex parts of the building for a full range of thermal insulation. Because of the site directly spraying the use of liquid materials, compared with the plate paste, can greatly save transportation

costs.

6.8 Easy maintenance, spray polyurethane hard foam maintenance is very convenient, after maintenance can make its appearance and function to maintain a good state.

6.9 Environmentally friendly performance

Sprayed polyurethane rigid foam is a kind of material with high chemical stability, heat-resistant, low-temperature-resistant, acid and alkali-resistant, and is friendly to the environment without damaging the environment.

3, pouring method of polyurethane rigid foam exterior insulation system

Pouring method of polyurethane rigid foam exterior insulation system is composed of: the base layer of the wall, polyurethane foam insulation layer, interface layer, polymer cement mortar composite alkali-resistant mesh cloth protection layer, auxiliary rigid reinforcement layer and finishing layer. The construction process is divided into removable template and inserted template two kinds. Removable template is poured foaming polyurethane, the template will be dismantled and reused, the template as a reusable machine; placed into the touch plate is poured foaming polyurethane is not dismantled, the template becomes a protective layer of polyurethane foam can also become a finish layer.

1 Placement type template pouring method process

Basic level treatment --- fixed template --- pouring foaming polyurethane --- no demolition template outer surface treatment --- anti-cracking polymer cover mortar --- paint finish or brick finish

2 Removable template pouring method process

Basic level of external reasoning --- template surface treatment of isolating agent --- support Template --- pouring foaming polyurethane --- dismantle the template --- polyurethane hard foam interface treatment --- anti-cracking polymer cover mortar --- paint finish or brick finish

3 construction precautions

a. The construction temperature should be higher than 10 degrees Celsius, the moisture content of the wall should be less than 8%, rainy days in the unprotected measures shall not be constructed

b. touch the board when fixed construction, must ensure the stability of the template. Must ensure the stability of the template, template fixed firmly

c. Pouring foam polyurethane, each injection should be a certain time interval, and requires that each injection should not be too large, in order to prevent deformation of decorative panels or swelling cracks.

d. Removable template casting polyurethane exterior insulation system, the surface of polyurethane rigid foam insulation layer should be made interface treatment to ensure the stability of the system.

e.The density of cast polyurethane foam body should be in the range of 25~45kg/m3, if the density is greater than 45kg/m3 foaming polyurethane is used, it should be carried out after local test, and then carry out large area construction.

f. Pouring construction should ensure the continuity of polyurethane rigid foam insulation layer, full, should not occur fault phenomenon.

g. Pouring polyurethane rigid foam body should be no cavity bonding, polyurethane rigid foam insulation layer should be free of defects such as hollow drums, cracks, peeling, etc., to ensure that the polyurethane insulation layer and the building wall solidly form a whole.

5 pouring method of polyurethane rigid foam exterior wall insulation advantages and disadvantages

5.1 pouring method of polyurethane rigid foam exterior wall insulation is less subject to the constraints of environmental conditions compared to the spraying method. Construction site on the operator's technical level requirements are not high. But the pouring method of construction is in the closed mold cavity for polyurethane foam, due to high polyurethane foaming times, foaming pressure, speed, the formation of the external expansion force is also large. How to mediate the influence of external expansion force on the template, improve construction efficiency, has been the pouring method of polyurethane exterior wall insulation construction problems. Pouring method foaming polyurethane in the exterior wall insulation system in the corresponding supporting technology, such as, polyurethane rigid foam body and the exterior wall body adhesion, the wall moisture content of the impact and its intermediate way, polyurethane rigid foam insulation layer and the bond between the protective layer are not formed a complete technical system. Because of this, pouring method of polyurethane rigid foam exterior wall insulation by technical constraints, less than the current spraying method is widely used.

5.2 pouring method of polyurethane rigid foam exterior wall insulation is foamed polyurethane into the closed mold cavity, foaming process without foam splash, less loss of foaming material, do not pollute the environment. The surface of the insulation layer is flat and smooth. Placed template is poured

Not dismantled, the template becomes a polyurethane rigid foam body insulation layer of the protective layer or finish layer, which not only forms a high smoothness of the surface, but also in the thin template within the normal construction of the heat preservation, waterproofing, decorative integration of technology applied to the high block exterior wall insulation finish decoration project.

6 cast-in-place polyurethane rigid foam composite board exterior wall exterior insulation system

Cast-in-place polyurethane rigid foam composite board exterior wall exterior insulation system, there are two types in common use at present, one is a fiber composite board with a finish layer cast-in-place polyurethane rigid foam exterior insulation system. Another type is composite cement board cast-in-place polyurethane rigid foam exterior insulation system. Fiber composite insulation board with finish polyurethane rigid foam exterior insulation system is an ideal substitute for EPS, XPS board, polyurethane rigid foam composite foam board can achieve 65% of the requirements of building energy efficiency.

Cast-in-place polyurethane rigid foam composite cement board exterior insulation system, its structure includes, the grass-roots wall, foamed polyurethane insulation layer, composite cement board, brick bonding layer and brick finish. The process is: in the grass-roots wall and cement sheet first set up

Longitudinal XPS extruded styrene plate keel, and then in the longitudinal XPS extruded styrene plate keel and cement sheet injected between the foamed polyurethane, polyurethane foam in the foaming process of the grass-roots wall and cement sheet firmly bonded into one. Outside the cement board, tile bonding mortar is used to paste the brick finishing layer. The process can ensure that the tiles are firmly pasted, not easy to crack and fall off, can be part of the construction, construction, construction site is basically pollution-free, small impact on the construction environment, more conducive to the energy-saving transformation of old buildings.

4, paste method of polyurethane rigid foam panel exterior insulation system

Paste method of polyurethane rigid foam panel exterior insulation system, including polyurethane rigid foam panel system with finishing layer and polyurethane rigid foam panel thin plaster system. The latter construction process is basically the same as the EPS board thin plaster exterior insulation system. The basic structure is: grass-roots wall, cement mortar leveling layer, polymer bonding mortar, polyurethane rigid foam insulation board, anchor bolt fixing, crack-resistant polymer cement mortar composite alkali-resistant mesh cloth, elastic putty, elastic paint finish.

Paste polyurethane rigid foam board can be used in two ways, one is the point frame method, the second is a coating method. Point frame method along the perimeter of the polyurethane board with a steel spatula coated with a prepared bonding mortar, pulp band width of 40 ~ 50mm, 10mm thick, when using standard-sized polystyrene panels, should be in the middle of the board surface part of the uniform arrangement of 8 bonding mortar points, each point diameter of 100mm garden bonding points, the center of the distance of 200mm, the bonding mortar coated area should not be less than 60%. Secondly, strip coating method, in the back of the plate full coating of bonding mastic, and then use the special sawtooth spatula tight pressure on the back of the plate, and keep a 45 degree angle to scrape off the excess bonding mastic between the sawtooth, so that the board surface to leave a number of strip width of 10mm, thickness of 13mm, the center of the distance of 40mm and parallel to the polyurethane board long side of the mastic band. After wiping the bonding mortar, the plate should be immediately affixed to the grass-roots wall wall sliding in place, paste the action of light kneading, uniform force extrusion. Polyurethane foam board paste, from the building of the exterior wall of the foot parts from the bottom up, along the horizontal direction of the horizontal paved no, each row of boards should be staggered each other 1/2 board length. After the board is firmly affixed, use the special trowel to rub the board edges flat to minimize the height difference between the boards. When the board gap is greater than 1.6mm, it should be cut slats to fill and smooth.

5. External polyurethane rigid foam exterior insulation system

External polyurethane rigid foam insulation board construction process and polystyrene board insulation system external construction is basically the same. External polyurethane rigid foam board board between the joints outside should use polyurethane caulking adhesive for joint processing, to ensure the integrity of the entire thermal insulation system, and to ensure that the external thermal insulation board is firm and stable, in order to increase the longevity and stability of the use of the system.

For the insulation layer outside the hanging decorative panels of polyurethane rigid foam exterior wall insulation system, the basic composition is: the grass-roots wall, three-dimensional adjustable metal keel hangers, keel base, foaming polyurethane insulation layer, silicone adhesive embedded seams, external decorative panels, such as, artificial stone panels, aluminum composite panels, fluorocarbon panels, fiber ceramic panels, and so on. External polyurethane rigid foam exterior insulation system, can be applied to high block exterior insulation decoration of public **** building, can also be used for ordinary residential and existing building energy-saving renovation projects.

6. Conclusion

Building energy efficiency is currently an important topic in China's construction industry, in order to improve the efficiency of energy use and thermal comfort of buildings, reduce energy consumption per unit of floor area and carbon dioxide emissions, building energy efficiency indicators increased to 65%. Foamed polyurethane high-efficiency thermal insulation and energy-saving new materials and their composite insulation technology is looking forward to.

Spraying method, pouring method, paste method and hanging method of polyurethane rigid foam exterior insulation has made great progress, but there are some technical problems to be decided in practice. In practical application, should be based on building design cost, geographical location and other factors to choose. With the continuous improvement of China's building energy-saving technology, with the gradual standardization of the exterior insulation system, standardization, foamed polyurethane exterior insulation technology is bound to make a great contribution to China's building energy-saving cause.

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