Build Daily

August 12, 2017 18:08

Wall insulation foam outside or how to put the house in the " fur coat " ?

Why foam - an ideal material for exterior insulation?

polymeric material has absorbed the most useful as a representative group of heat insulators:

  • low thermal conductivity (0,037-0,041 W / (m × K));
  • lightness, strength and durability;
  • biological and chemical neutrality.

As expected of any new product, the foam has an exclusive property that allows to compete with the best representatives of the classic "heat-unit".It - is waterproof and is not afraid of direct or partial contact with water.Such "attack" will not stand none of the famous cotton insulation, which is under the influence of moisture and hardens rapidly losing their unique beneficial qualities.

But foam - all at all!And its cost caresses the soul lean owner so pleased that this material most preferred builders in the construction of "coat" for the home.

But external wall insulation foam is fraught with a serious problem.The heat insulator is classified as flammable materials, that is, when a fire breaks out and quickly supports th

e power of devouring flame.Moreover, the foam is not only well-lit, but also identifies with the acrid poisonous smoke.

developers did their best to eliminate such discriminatory dent in the reputation of the polymer, creating a special "ogneneytralny" type foam.

Polyfoam PSB-S for thermal insulation of external walls of fireproof "fur»

usual foam actually cut from the air ....In its manufacture using polystyrene (emulsion type B), which is under the influence of high temperature and special chemical additives (such as blowing agent), foam, forming a huge amount of sintered together tiny bubbles (5-15 mm).

cells closed and filled with air, of the virtually finished polystyrene material contained only 2-3%.The captured gas is the cause of such a record performance of its thermal conductivity.For example, the additional wall insulation foam (layer of 12-13 cm) is equivalent to "supplement" to the existing building brick box 2 meters thick!

But what about the "nature of the flammable" material?

the production of a special type of extruded foam is used flame retardant.An effective supplement is doing its good work - material PSB-S (so its factory marking) does not support combustion.Under the influence of flame such foam does not smoke, but just melts.Once the fire "aggressor" is eliminated, it will go out within 4 seconds.

Extruded polystyrene PSB-S the average cost for 20-25% more expensive than the simple analogue material, but for the safety and peace of mind is worth to pay.In addition, it retains all the beneficial properties of precursors and very easy to use, because:

  • available in sheet form;
  • easily cut with an ordinary hacksaw;
  • there are three types of density of the material.

For external wall insulation foam used medium type PSB-S-25.

technology of warming of external walls of foam

The best way to learn how to perform a foam wall insulation outside - video lesson from the master practitioner.But from theory it is not necessary to dismiss, so we will describe in detail all the stages of this type of decorating.

wall foam insulation technology outside includes such operations:

  • Thorough cleaning of the work surface. Walls should be free from dirt and dust, even once removed adhering solution.It is necessary to check the strength of the base, if it has "weak spot" (the old delaminated plaster, cracks), then they must be repaired.
  • Fastening material to the wall. Thermal insulation foam with your hands is performed strictly according to the technology, any concession to the side is fraught with negative consequences.So remember: it is necessary to use glue to secure the material and wall plugs!To begin with the walls covered with primer, then coated on a sheet of foam solution (by blots or continuous layer) and tightly pressed to the wall.First row start with angles and placed on pre-set the starting profile.Each sheet is further nailed at least by 3 plastic dowels (full set - 5 pieces).
  • Installing the fastening of the grid. you need a special glue (not to be confused with a mounting solution for the polymer thermal insulator) and fiberglass mesh density of 140 g / m3.It is necessary to ensure that the outer wall insulation foam has not prevented a strong fixation to the "cake" of the future plaster.The mesh will create a firm foundation for further decoration of the facade.To this white "coat" coated with a thin layer of glue (5 mm), and it utaplivajut fiberglass "mini-valve".
  • Finishing facade. final step is plastering and painting of the facade selected developer tools.

Traditionally used foam material layer of 5 cm. For thermal insulation of external walls In fact, the technology involves the 10-inch polymer ball, laid two consecutive rows with the obligatory bandage seams.This technique provides a reliable protection of the surface of the "bridges" cold.