Finnish windows, which are twice as warm as usual. Or why Finns don't have windowsills

It is known that an energy efficient house is not only warm walls, roofing, ventilation with recuperation, but also warm windows. Up to 40% of heat loss in the house can be caused by windows. It is imperative to install high-quality, reliable and warm window solutions in your home.

I remember from childhood that every autumn in our country house we inserted a second inner frame, plugged the cracks and pasted over with paper. And in the spring they removed it. Old apartment buildings also have double frames. But these are single-glazed systems. The Finns, as residents of a northern country with a harsh climate, abandoned this principle, but use it with double-glazed windows.

Double framed wooden window. Sometimes such a window solution is called Scandinavian windows. Single-chamber double-glazed windows on the inside and simply glazing on the outside. But there are also two single-chamber double-glazed windows. By fixing the frames through the hinge, they open simultaneously. In this case, they do not open completely, but only for ventilation. To open the frames completely, they need to be disconnected. As a rule, Finns have wooden windows.

In fact, it is one large frame with internal and external sashes. Between the frames - a wooden box made of glued knotless pine with a decorative coating. Rubbed in the spring - and clean.

Someone will say that such windows are inconvenient to open. The current trend is that windows should not open. Ventilation should be responsible for the exchange of air in the room. And the Finns have ventilation with recuperation in almost every house.

One of the window designs in section. The outer frame is made of a plastic profile. Internal - wooden. Single-chamber glass unit in each frame.

Another convenient solution is to place the blinds inside, between the frames. They will not gather dust. And their control is displayed inside, into the room. You do not need to constantly open a window to open or close the blinds.

In Finland, the main technologies for the construction of private houses are timber or frame solutions. The wall thickness is small, up to 250 mm. And when using such windows, they do not have window sills. The window takes up the entire thickness of the wall and there is no room for the window sill. They also save on internal slopes.

Finnish window overview:

The two-frame windows themselves are, of course, more expensive than ordinary windows, and much more expensive. The cost of double-frame windows in Russia is from 350 Euro / m2. Those. if the average window area 2 m2, then its cost will be 65 thous. rub. But the heat transfer coefficient of such windows: 0.64 - 1.0 W / (m2 • ° С) (energy efficiency class: A +). And soundproofing properties - 33-49 dB. Whereas the norm for plastic cones is 2.22 W / (m2 • ° С). Those. Finnish windows are twice as warm as ordinary plastic windows.

Manufacturers often indicate the resistance to heat transfer in the characteristics of plastic windows. Indicate the opposite value: 0.63 (m2 • ° C) / W.

Whether it is necessary to overpay for windows 2-3 times is up to those who are building a house for themselves. If you heat the house with main gas, then no. Such windows will not pay off even within 20 years. And if with electricity, and even in the Siberian climate, then you might think. There is one but - conventional ventilation can reduce these savings.

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