Why is it better to insulate walls from the outside than from the inside?

Why is it better to insulate walls from the outside than from the inside?

Why is it better to insulate walls from the outside than from the inside?As a rule, houses are insulated from the outside. This is dictated by the fact that in our climatic conditions we care more about protecting houses from heat leaks in winter than from overheating in summer. Therefore, it is important that with this method of laying thermal insulation it is easier to eliminate cold bridges that could arise in the external partitions of the building. It should be noted that if you are interested in the price of wall insulation, we recommend visiting this site.

We usually install thermal insulation from the inside only when it is not possible to do it from the outside. The reason may be, for example, that the house is subject to conservation protection and its facade cannot be changed, or we want to insulate one apartment in the house, the comprehensive modernization of which the community does not yet plan.

Warming from within

However, there are also people related to the construction industry who consider the principle of insulating houses from the outside to be wrong. They are of the opinion that since heat leaves the house, and “cold” does not enter it, thermal insulation should be from the side of the heated room.

They also emphasize that when we want to heat a home that is insulated from the inside, we don’t have to waste energy raising the temperature of its brick walls, so we can do it faster and at a lower cost.

Outside or inside

To begin with, the problem of which side is more profitable to lay the insulation does not apply to frame houses in which the outer walls, roof and ceiling above an unheated basement are filled with thermal insulation to their entire thickness. The same with the walls of houses made of solid wooden logs.

Therefore, it seems that the choice of the place of insulation mainly concerns brick houses. In our country, of course, this is important, because here such houses are built in the first place. The only question is whether the issue of the location of thermal insulation equally applies to all external partitions of such houses.

Similarly, with floors on the ground of houses without a basement: in them, thermal insulation is usually laid on a concrete base, i.e. from inside the house. It would be possible to do the opposite and lay the insulation under a concrete slab, but with the traditional foundation of a house on benches, investors rarely decide to do this, fearing the settling of polystyrene. However, it is clear that the decision on where the floor insulation will be located is due to strength, and not hydrothermal considerations.

foundation slab

Similarly, when the house is built on a foundation slab. The only difference from the floor on the ground is that the thermal insulation of rigid and non-hygroscopic extruded polystyrene foam is placed between the slab and the ground for technical reasons, i.e. outside the house. However, often an additional insulation made of rigid polystyrene is also laid on the slab, and on it — as in the case of floors on the ground — a concrete screed, which is the basis for the floor.