Today, our dear friend, we step even deeper into the story of how to wisely choose joinery for your home. Even if now it seems to you that all doors and windows are the same, that there is no difference between them, you should know that there are big differences between different types of joinery. At the end of our series of informative articles, you will be able to differentiate between the many types of doors and windows, you will understand the benefits of each and you will be able to make an informed and documented choice. The first detail that is very important to consider is the profile class that is given by the thickness of the exterior walls. This feature is so important because you as a future buyer will have to take it into account especially if you live in a region with an extremely problematic climate. There are currently two types of profile classes on the market: class A and B. They offer a different energy efficiency to your joinery and also contribute to its durability over time and that is why it is important to know the differences between them. **Class A profiles** Class A profiles are the ones that require the most level of work in their realization, which is why they are considered to be the most qualitative. The thickness of the exterior walls must be at least 3 millimeters for this category. They are used especially in areas where the difference between the average temperature in winter and in summer is greater or equal to 30 degrees Celsius. Another criterion, without knowing the two average temperatures, is only the average annual temperature, which if it exceeds 22 degrees Celsius, places the area in the series of regions with severe climate where class A profiles are required. They have a corner resistance 20% higher than class B, reduce torque by 12%, and screw removal is 20% harder compared to class B according to a study conducted in Germany. Therefore, class A profiles give a superior quality to your joinery as it helps to reduce its degradation over time, thus keeping your windows and windows at their maximum efficiency for as long as possible. **Class B profiles** Class B profiles are less efficient than class A. They have a smaller outer wall thickness of at least 2.8 millimeters, so the contribution to the strength of the joinery over time is lower, as well as improving energy efficiency. Experts say that the manufacture of a class B profile uses a quantity of raw material 10% smaller than the amount used to manufacture class A profiles, which are thicker. For these reasons, class B profiles are recommended for areas with a moderate climate, where the temperature differences from winter to summer are not very large and the weather is moderate. In conclusion, dear friend, you must know the importance of the thickness of the exterior walls in the joinery profile in order to choose the quality. Remember, the thicker walls the profile has, the more efficient your joinery will be and the longer it will last. Choose to inform yourself before making a decision, and if you think you are ready to make this long-term investment, we are waiting for you with the highest quality windows that can not wait to arrive in your home. Ax Chassis Portes et fenêtres Vers ton univers intérieur