How to insulate walls with extruded polystyrene foam

Posted by: 24.10.2017

To improve the insulating properties of the walls, there are different types of materials, but the greatest demand is for insulation from extruded polystyrene foam. This publication describes the basic performance characteristics and features of the installation of this material.

How to insulate the walls

Technology of preparation of EPP and its properties

To get a quality EPP, you need to mix the polystyrene granules with a foaming composition, which includes carbon dioxide and freon. After that, it is necessary to subject it to high-temperature processing and to pass the resulting mass through an extruder, with the help of which a good liquid composition is obtained.

In conclusion, the liquid mixture is pressed in the form of sheets, and after it hardens to turn out a light, high-strength insulation with smooth sides, so that heat is very well preserved.

The quality of thermal insulation will depend on what brand of heat insulator. Because, the higher the mark, the better the insulation and the lower the thermal conductivity. It is good to warm with such sheets the bases, walls, floors, windows and roofs. They are durable, durable, moisture-proof, over the years do not deteriorate, and the mold does not start, fireproof.

Extruded styrofoam

Wall insulation using EPP

Warming of walls can be made independently, for this purpose it is necessary to perform the following works:

  • prepare the walls;
  • produce insulation plates;
  • lay a fiberglass reinforcement mesh;
  • finish the finish.

To do this, you need the following tools:

  • perforator;
  • angular, straight and notched spatulas;
  • roller and brush;
  • grater for foam;
  • liquid primer;
  • facade paint;
  • cement based glue;
  • polyethylene;
  • mushroom mount sizes 100 * 10 mm and 7 dowels on 1 foam sheet.

For laying insulation you need to perform the following steps:

Seal all cracks on the walls and coat the surface with a primer. The primer composition protects well against corrosion and qualitatively glues the solution with foam.

Fix the lighthouses on the walls so that the bed lies evenly.

For outdoor insulation you need to buy insulating sheets, the thickness of which is 100 mm. If you suddenly bought insulation size 40 or 50 mm, then you can put them in two layers.

The first row of EPP should be laid as evenly as possible, for this purpose a metal profile is fixed on the surface. With the help of a tape measure and a construction level, you can draw a line where the first row of EPP will be strengthened, then a metal profile, the thickness of which will be larger or the same as foam plastic, will be strengthened to this line. Thanks to the metal profile, the insulation is qualitatively fixed to the wall.

Prepared glue, according to the instructions, fluff on one side all the corners of the foam, and the adhesive composition is applied to the middle.

Attach the EPP to the wall and fix it with dowels with a wide head (popularly referred to as “umbrellas”). It is necessary that when laying on the wall of the foam, the glue does not fall on the joint, and lay on the brick.

For good contact with the wall, you need to use special washers to attach fastenings to them, so as to connect the ends of the profile (there should be at least a gap of at least 2 or 2,5 mm between them).

For the corners you need to use an angular spatula. The plates of the foam are stacked on the principle of "chessboard", you need to start from the bottom up, and not vice versa. If voids are formed, they can be sealed with pieces of foam, cut out in the form of gaps.

The slopes for the windows need on the sides and on top to glue with foam plastic, the thickness of which should be 20 mm. After that, the walls should freeze for at least 2 days.

After the foam has been glued, you need to put on it a special mastic and lay a reinforced fiberglass mesh. Once it is fixed, you need to once again walk the mastic on the insulation. After the mastic dries, wipe with a trowel net all parts for a smooth, uniform surface and coat with a primer. If the primer is dry, you can proceed to the facade finish. It can be done with the help of tiles, decorative plaster or facade paint.

After repair, the room will become much warmer, but the wall will not allow air to pass through, so you need to think over the ventilation system.

Extruded polystyrene can be warmed the building from the inside, for finishing materials, in this case it is better to use drywall.

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