The construction of polyurethane foam is used quite often and is suitable for warming the interior and exterior wall surfaces. Such a material has a plurality of positive characteristics. However, there are some nuances that are important to know when polyurethane foam wall insulation at home.
Polyurethane foam: characteristic
Polyurethane foam is composed of two components - a polyol and isocyanate. When mixing the two components together, under the influence of carbon dioxide and heated to a certain temperature polyurethane foams.
Polyurethane foam has a lot of positive physical properties:
- Do not start rodents and insects.
- Non-flammable and resistant to mold, fungi.
- High sound insulation.
- Availability of seamless coating liquid for insulation of walls polyurethane foam.
- It protects the surface from the various negative effects of the environment.
- Resistant to fire and mechanical damage.
- Good sound absorption characteristics and wind insulation.
- This insulation material is non-toxic and is considered safe.
- polyurethane lifespan by an average of 40-50 years
Polyurethane foam fills the smallest parts, leaving no gaps. Thermal insulation based on polyurethane is resistant to moisture, alcohol, benzene and other aggressive liquids. PUF not heavier construction, quickly applied and cured for one hour. Also, low cost is different. Positive characteristics allow to apply polyurethane to any surface material.
Among the shortcomings can be noted the high cost. Warm surface may be on their own and not to involve other professionals, however, will need the appropriate equipment for the application of foam. It is important to know certain skills to work with this type of insulation. Polyurethane can break down when exposed to sunlight, so you should apply a special UV protection.
The use of polyurethane foam
This material is used in the production of some of the elements of accessories, refrigeration equipment. However, most often used in the construction foam for thermal insulation of houses. Can be supplied either in liquid or solid form. In liquid form material is applied to the surface of the thermally insulated by pressurized spraying. After contact with the air, liquid material is converted to foam. Conveniently spraying material on horizontal and vertical surfaces.
PPU is available in two types: open and closed structures. Insulation closed cell ( "rigid foam") has better vapor barrier properties than a material with an open structure.
Tools for the application of polyurethane
Winterizing facade of the building with polyurethane foam perform with their hands is difficult, but can be performed in compliance with the installation of thermal insulation technology independently. It is important to prepare all the necessary tools and materials in advance to perform the installation of high quality.
For spraying polyurethane foam facade of the house will need the following tools:
- Special spray gun.
- Two cylinders with polyurethane foam.
- Compressor for pressurization.
- Special nozzles on the sprayer to regulate the volume flow and foam pressure.
- A special suit for protection (goggles, dust mask).
Important! Without protection to carry out installation work is strictly prohibited.
After preparing all the necessary tools you can start warming the walls of the house.
Spray foam
High-pressure device operates at a voltage of 380V. usually only 220 V. In any house To provide the required voltage, the generator must be used. From the network device can operate low-pressure, but the quality of the polyurethane foam insulation will be worse.
The walls of the house is better insulate the outside. If you perform the insulation from the inside, the wall will freeze. When using the "solid foam" parogidroizolyatsiya not applied, as a closed foam structure has a high moisture barrier properties. Vapor control layer is required in the event that the "soft foam" is used for spraying.
What should be the thickness and density of the foam
If wrong calculate the amount of required material and thickness, it will not perform the function of heat insulation. In case of insufficient thickness of insulation is likely damage to the house structure. If the dew point is located inside the building, the condensate accumulates on the walls, there is dampness in the house and mold.
The thickness of the foam walls must be 50-70 mm, foundation - 30-70 mm, and the floor of the basement - 50-70 mm, mansard roofs and - 120-150 mm. These parameters may vary according to the climate, quality and density of the insulation and the like. D.
Polyurethane foam can be used for thermal insulation of different constructions.
This will determine what density should be selected teploiozolyatsionny material. Brick House externally insulated with polyurethane foam density of at least 70-80 kg / m3. If the walls of the building facade and wooden material is used that density of 50-60 kg / m3.
It should be noted that the lower the density, the lower the cost of insulation.
Instructions insulation facade house using foam
Before insulation it is important that the walls were smooth without slots. If they are present, then they definitely need repaired. First, from the nip to remove any debris and then to pour mortar, plaster or plaster mixture. The choice depends on what is covered by the wall.
The application of heat-insulating coating consists of several stages:
- The construction of crates. For this purpose use can be of wood or metal profile. This design allows you to create a kind of cells for insulation. Wooden crate necessarily should be treated with antiseptic.
- Preparation of polyurethane foam. This stage involves the mixing of two materials - polyol and isocyanate. They are supplied in two bottles. They are interconnected as well as with a sprayer. At the time of these works it is recommended to wear protective clothing. Next, make a test run of the solution to make sure that the components are fed at regular intervals. Thereafter, the nozzle can be put on and begin warming.
- Spraying polyurethane. To carry out work should be bottom-up. The spray gun should be kept at a distance of 50-60 cm from the wall. It is recommended to apply the insulation, ranging from hard to reach places, and then pass the rest of the surface.
- The foam can be applied in several layers, however, must wait until the first coat has dried. Otherwise, the insulation thickness is more than the norm.
- After finishing work remove the nozzle from the gun and close the valves in the tanks.
- Alignment solidified material is carried out by cutting a polyurethane foam.
It should be remembered that the deposition of material on the outside should be only in dry conditions and at a temperature at least 10 degrees.
- Mounting of the lining material is undesirable to carry out later, since the heat insulation material is adversely affected by sunlight.
The building is very important to take into account two important factors - the quality of the material and professional experience. To avoid possible errors, it is advisable to entrust the work of experienced professionals.
Warming plates PPU
With such a method facade insulation handle even a novice engineer. With insulation foam boards should also know some of the nuances.
First, you need to clean the surface from dust and dirt. If there are gaps, then seal the cement-sand mortar.
Plates PUF 600h1200 mm size deposited on said surface by means of adhesive. Laying is performed in the direction upwards. Plates should be packed tightly together.
Additionally, you can use dowels. Holes are made in the corners and in the center. In the case of inconsistencies and slits in the process, they can be eliminated using foam.
On top of the thermal insulation material is laid reinforced mesh. It is important to leave the plate to dry a couple of days, that ensure great grip panels with insulation surface.
Polyurethane in slabs is quite durable and hard material with low water absorption. It allows you to perform wet work, for example, to use plaster.
Selection method of warming or spraying using slabs of polyurethane depends on many factors. In any case, the installation can be done by yourself, if you closely follow the instructions.