SECURITY DOORS AND RESISTANCE TO AIR, WATER AND WIND
A security door is your first defense line between two worlds: your home and everything external to it.
That’s why, especially if your home is in direct contact with the outdoors, it is important to ensure good insulation. When buying an armored door, therefore, weather resistance is something you should consider, to prevent any water seepage or air passage under the threshold of the door leaf.
Thermal bridging consists of a point of discontinuity in the materials that make up a wall, it is created when a part of the building enclosure has very little resistance. This means that in the winter there is the likelihood of more heat loss from the inside to the outside, and in the summer season there is heat loss from the outside to the inside, with the formation of mold due to condensation, but also structural problems and increased energy consumption. To prevent creating these conditions, it is essential to structure and design of every element in contact with the outside in an optimal way. Consider that thermal bridges on the frame can go as far as tripling the transmission and heat loss of the door.
How can you ensure that a product is actually resistant to water, air, and wind? There are regulations that aim to measure the performance of the door and window product, as well as classify it. In this way, those offering the product can advertise its classification while guaranteeing quality, and the end consumer will have a clear picture of what they are buying.
The resistance to wind loads
How can you understand whether a door is able to resist wind action? The UNI EN 12211 standard defines the degree of wind resistance. The resistance performance is measured in the laboratory by a test that creates different pressure conditions by simulating wind action. Based on the response, the window or door is made to fall into one of 5 classes.
Thanks to the UNI EN 12208 standard, 10 water tightness classes have been identified. Products fall into the minimum class when they show no seepage after being subjected to the jet of water and atmospheric pressure for a duration of 15 minutes. The highest level of performance, on the other hand, is achieved when windows and doors are watertight after 55 minutes of testing at a pressure difference of 600 Pa.
This element is regulated by the European standard UNI EN 12207, which reports the permeability with respect to the entire area of the windows and doors and with respect to the length of the openable joints. Permeability classes range from 1 to 4, where 1 represents the minimum performance level. Before buying a security door, remember to take these elements into consideration and check the performance class ratings for air permeability, water tightness and wind resistance.
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