Build Daily

Construction Materials

August 12, 2017 18:08

Choose a glue for styrofoam


  • 1 Application polyurethane adhesive
  • 2 Preparation of dry mixtures
  • 3 How to prepare adhesive

Pasting external walls of polystyrene foam boards at home - a reliable way to insulate a home.Currently polystyrene fastening to the wall in two ways: the use of one-component polyurethane adhesive (packing - balloon) or the use of dry mixes (usually packed in bags).

consider both methods in more detail:

Application polyurethane adhesive

one-component polyurethane adhesive used for bonding plates of foam and extruded polystyrene.Mounting Adhesive for expanded polystyrene is used in work on the outer insulation of the walls of houses.Adhesive composition contains isocyanate polymers that have a high level of viscosity which promotes rapid primary settable.As a result of the reaction of moisture which is in the atmosphere, and isocyanate adhesive hardens.

polyurethane adhesive for foam polystyrene: advantages

- a high level of adhesion (Clutch) to expanded polystyrene and the b


- convenience and ease of use;

- foam polystyrene for fastening allows to operate at lower temperatures than the dry adhesive mixtures;

- use adhesive contributes to a significant reduction in terms of thermal insulation works on the walls.

Glue consumption of this type: one bottle is enough for slabs of expanded polystyrene gluing area of ​​5-6 m2.

How to prepare the ground for pasting polystyrene foam?

- The substrate must be cleaned from dirt and substances that reduce adhesion: fats, oils, paint, varnish.To remove the used solvent or water under pressure.After exposure to water surface should be dry.

- The substrate must be solid, that is determined by the tapping.

- If there is on the surface of the fungus or moss - we clean with a steel brush and then treated with fungicidal agents.

- If the base is made up of well-absorbent material (silicate blocks, foam concrete, aerated concrete), it is necessary to make the surface of the primer and allow to dry.

Execution of foam polystyrene for fixing

  1. Apply glue, departing from the edge of the Styrofoam 20 mm around the perimeter and a line diagonally.
  2. We put a plate of expanded polystyrene, lightly presses.
  3. Within 20 minutes you can adjust the location of the plate.
  4. gaps between the plates should not be more than 2 mm, the plates need to be glued in the same plane.
  5. After 2 hours it is possible to strengthen the polystyrene expansion plugs.

Preparation of dry mixtures

This type of adhesive for bonding polystyrene foam consists of a polymer-mixture comprising mineral fillers.Adhesives prepared from dry mixes, has ductile rapidly solidified has high adhesion to the surface (adhesion), it is simple to use.

To prepare the glue will need:

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- a bucket of water;
- container for glue;
- paddle to stir the glue (you can use a drill, but rather specifically for this tool);
- dry mixture.

How to prepare adhesive

Consider as an example the preparation of an adhesive for polystyrene boards.To do this, you must observe certain sequence of actions:

Pour into a bucket of water.The water volume calculated by the formula based on the number of adhesive (per 1 kg of dry blend - 0.24 liters of water).For example, a mixture of 6 kg - 1.44 liters of water.

Measure out the right amount of dry mix, in our example - 6 kg.

Gradually add the mixture into the water, mix thoroughly.Mix should be long until the lumps disappear.

Give the mixture to stand for 5-10 minutes.

the mixture is stirred again.for gluing Styrofoam glue is ready.

Glue consumption of dry mix when mounting to a wall polystyrene - about 6 kg per 1 m2.

Cooking glue dry mixture - tips

- Water and all containers used for the preparation of the adhesive must be clean.
- Do not stir the glue from the previous batch remaining in the container, the batch with the new - it can lead to premature adhesive settable.
- rotation speed of the blades using a special drill or mixer must not exceed 300 rpm.
- blade must be fully immersed in the mixture, otherwise air bubbles may be formed, which will reduce the cohesive adhesive twice.
- glue from a dry blend must be used within 2 hours.

Popular brand of glue for polystyrene

- Penosil - adhesive foam, has excellent sealing, adhesive qualities.
- Knauf Sevener - dry mixture has a lime-cement base, contains special additives and fiber, providing a high level of adhesion and treschinostroykost.
- Technonikol - adhesive foam used for expanded polystyrene and extruded polystyrene foam, resistant to humidity, aging, mildew.
- Cerezit - adhesive foam has good water resistance, thermal insulation properties.
- Bitumast - adhesive extruded polystyrene foam, is made on the basis of bitumen, solvent, filler and plasticizer.Not afraid of cold temperatures, creates an additional waterproof surface.

Video to work with polystyrene

installation errors polystyrene