The technology of wall insulation foam outside with their own hands
Exterior insulation of the building can significantly reduce energy losses and save on heating. This method requires the use of durable and moisture-resistant material. The cost of thermal insulation should not be a significant part of the budget provided for construction. Experts recommend to perform wall insulation foam, while the work is easy to do with your own hands. Expanded polystyrene plates are characterized by low thermal conductivity, strength and durability. To install insulation gave a tangible effect, it is necessary to strictly follow the installation technology.
Characteristics and properties of foam
Polyfoam - universal insulation, it can be used on any part of the external walls of the house from the foundation to the roof. It is a white plate with a pronounced granular structure. Closed gas-filled pores, which form the basis of the material, provided him with optimal performance characteristics:
- thermal conductivity - 0.038-0.042 W / m * K;
- density - 15-40 kg / m3;
- water absorption - 2% of the volume;
- operating temperature - from -55º C to + 75º C;
- vapor permeability coefficient - 0.05.
The material is environmentally safe, it has no toxic secretions. Its surface is not exposed to mold and fungi. The low weight of polymeric products facilitates transportation, self-assembly and load on the structure.
The foam is produced with the following parameters of the plates: 100 × 100 cm, 100 × 50 cm, thickness is 1-10 cm. For effective insulation of walls outside, you need a material with a thickness of at least 4 cm.
The strength and durability of the foam depends on its density, the higher this indicator, the more reliable the insulation. External insulation of walls implies an increased load in the form of a finishing layer of plaster, therefore plates with a density of 25-35 kg / m3 will be required. The democratic price of expanded polystyrene has made it the most popular heat insulator in private housing.
The disadvantages of using foam
Choosing which heater to mount outside the walls, you need to explore all the pros and cons. Polystyrene foam plates have several disadvantages:
- high class of flammability - G3-G4, the material is highly flammable, when burning emits poisonous gas.
- structure damage by solvents and paint;
- attraction for rodents.
High fire risk is compensated by placing insulation under a layer of non-combustible mineral finish or decorative siding.
Extruded polystyrene foam - differences and similarities of materials
Extruded polystyrene (EPS) is a finely porous insulation with a uniform and dense structure. This type of foam plates has the best resistance to moisture, fire, mechanical stress. The edges of the sheets of individual brands of insulation is made with a sample. This design reduces the likelihood of cold bridges. The thickness of the plates is 20-50 mm, they are recommended for installation under siding. The cost of EPS is 1.5-2 times higher than that of polystyrene, therefore, what kind of insulation is better - each buyer decides individually.
Calculation of materials for thermal insulation
Calculate the required amount of insulation can be calculated by the area of the outer walls of the building. To do this, the length is multiplied by the height and take away the area of the existing window and door openings.
Foam plates have a convenient size of 1 × 1 m and 1 × 0.5 m, which means 1 square meter. m and 0.5 square meters. m, respectively. The quantity of products must correspond to the area value.It is better to add 10% per fit to the calculated amount of materials. The size of the mesh for reinforcement is also equal to the area of the walls of the house.
The foam plastic fasteners are made with plastic dowels, 5 sheets are required for each sheet. The amount of glue and plaster mix depends on the thickness of the applied layer and the manufacturer. On the packaging of the compositions is always indicated consumable mesh.