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A weak link of warming, about which you did not even suspect

A weak link of warming, about which you did not even suspect

The threshold of the entrance metal-plastic door: how to avoid heat leakage?
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In the threshold area of ​​the entrance door, as a rule, there is a bridge of cold. The threshold can not be a height of 60-70 mm, as, for example, the lower part of the window, because it is necessary to provide accessibility (for people with special needs, the elderly, children, etc.). The maximum height of the protruding part of the threshold above the floor level is 25 mm (to provide access in public places).

The threshold for entrance metal-plastic doors is traditionally made of extruded aluminum. It is strong enough, but it creates a bridge of cold. The necessary reduction in the height of the thresholds creates structural difficulties with sealing loops. Leakage and cold construction of the thresholds lead to condensation and even icing of the entrance door at the bottom, as well as to large heat losses due to incoming cold air through the slots. As a result, the front door becomes a "weak link in the insulation" in the external contour of private houses, the outer doors of apartment buildings, public and commercial buildings.

Warm door threshold
Photos: Universal service
The bottom of the front door is the most unprotected and cold place in the house. The floor temperature in the room is more than 20 ° C, and the door threshold from the side of the room has cooled to almost 0 ° C.

Another irony is that the building is checked for air permeability using the Blower Door test - a mandatory test in determining the energy efficiency class of the house. When testing a building in the opening of the entrance door, an airtight partition with a fan is installed. As a result, this test does not take into account one of the biggest problems in sealing the house - sealing the front door in the threshold area.

Thus, even if the house receives a high energy efficiency class and must save a lot of money on heating and air conditioning, in practice everything may not be so optimistic. Wreck through a non-insulated part of the front door "blow out" all the savings from investments in energy efficiency of the building.

A draft in the door entry threshold is a common problem for steel, wooden and metal-plastic doors. One such gap can negate all the costs of replacing windows and wall warming
Video: Sveta Malinina, YouTube

On the one hand, the threshold should be strong, because it is attacked, and flat, so as not to stumble over it. This is completely different from, for example, the lower part of the window: the projection of the frame does not bother anyone, it reliably and tightly closes with the sash, blocking it.

When buying a metal-plastic front door, demand a warm door threshold . This is a matter of energy efficiency of the whole house

Normally the thresholds were made from aluminum, and the lower they are, the less reliable the seals are. As a result, the thermal insulation due to seals and the use of aluminum fell sharply. The door at the bottom was blown and often was the coldest point in the house.

The solution to this problem can be, for example, the use of a special warm threshold, which consists of a combination of aluminum and plastic. This threshold allows almost completely breaking the cold bridge in the lower part of the door.

Buy a warm threshold and replace it yourself, without dismantling the door, it is impossible. Therefore, when buying a metal-plastic front door, require a warm door threshold. This is a question of the energy efficiency of the whole house.

Warm door threshold
Photos: Universal service

Another "weak" place - it's the corners of the door of the lower part, along which there is a draft. To isolate these places, so-called windstops are used that cover such slots.

Warm door threshold
Photos: Universal service
The article is published as an advertisement
The views and opinions expressed in this article are those of the authors and do not necessarily reflect the official policy or position OKNA.ua
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Nyka
Понимаю, что это реклама Универсал сервис, но цельно металлическая накладка пластикового порога не может конкурировать по сопротивлению теплопередаче и восприятию механических нагрузок с алюминиевым порогом, имеющим терморазрыв.
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Компания Универсал сервис предлагает и такой вариант алюминиевого порога с терморазрывом :
https://okna.ua/price_list/p-6818
http://www.universalgroup.com.ua/catalog/23/312/
http://www.universalgroup.com.ua/catalog/23/316/
Feb 28, 2018, 10:23 AM
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OKNA.ua Platform
Nyka
Понимаю, что это реклама Универсал сервис, но цельно металлическая накладка пластикового порога не может конкурировать по сопротивлению теплопередаче и восприятию механических нагрузок с алюминиевым порогом, имеющим терморазрыв.
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Есть разные варианты комбинаций пластиков и алюминия для реализации термоизоляции и что важнее — низкого уровня воздухопроницания. Терморазрыв посередине порога не закрывает полностью проблему из-за смещенного расположения уплотнителя, которое часто используют для нижней части двери.
Feb 27, 2018, 11:19 AM
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Nyka
Понимаю, что это реклама Универсал сервис, но цельно металлическая накладка пластикового порога не может конкурировать по сопротивлению теплопередаче и восприятию механических нагрузок с алюминиевым порогом, имеющим терморазрыв.
Feb 26, 2018, 12:58 PM
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OKNA.ua Platform
Алюминиевые двери тоже бывают разного качества
Feb 21, 2018, 10:51 AM
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OKNA.ua Platform
Двери из алюминия - штука хорошая. Качественные входные металлопластиковые двери на самом деле могут не уступать алюминиевым по надежности. К сожалению, на рынке присутствуют "удешевленные" пластиковые входные двери, дискредитирующие всю группу товаров
Feb 21, 2018, 10:49 AM
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A
Правильная статья. Но нужно ставить двери из алюминия.
Feb 21, 2018, 4:32 AM
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