Latest / RENEWA Sanierungsnavigator / Fenstersanierung: Grundlagen & Praxiswissen
Transcript
- Oliver: At this point we often about heating and insulation. But what not only makes and optical huge difference are course the windows. You and that quickly the house a different character. But what do you to consider? What should you about your exchange and what does it in the end? I'll today with Alexey in the Reneva sanatorium navigator. Hello Alexey, when we about renovation, we first about heat pumps, roofs. Many think about insulation. When I your conversations, windows are always big topic. Why are windows so important? Yes, totally good point. And honestly, also a classic in the renovation. Windows are often underestimated. This can big weakness in the building shell, especially in very old buildings. You can The building cover consists of roof, wall and windows and a basement ceiling or a floor. The window is the building material that normally has worst U-value, where most heat goes If we have an old building, seems that 20 to 30 percent of the heat goes through the the over the window in this case, loses direct through transmission or just through ventilation. Of notice in everyday life, it pulls on the window when you next to it. You the difference between a new window, three-fold glazed, heat protection and a window that is simply glazed. When I next to I have a feeling That's actually not even just on the window itself, but also on the right installation. Now you've just mentioned the term U-value. That sounds to many people, like me. So what that exactly? The U-value simply how much heat goes through the window. So now because I have 20 degrees inside, outside it minus 10 degrees outside and because of 30 degree temperature difference, heat through. that there no vacuum. in principle, the U-value now how good is the window, how much heat goes through it, how much watts per square meter and degree temperature difference. With the window we now have a special case, there are few different U-values, they are often a bit, so maybe briefly explained. There is a UG value, G like glass, an UF value, F like frame and an UW value for the whole window. And if you them apart bit, you can quite different statements. That's why always important which one you talk We're talking about the UV value It's about the entire window. And they in last decades. old buildings, they are at 2.5 to 3 when the windows are glazed. And if you have very old, easily glazed windows, then definitely exchange. I beforehand. Then they're much worse like at 5 or something. And if you new two-fold glazing, then you're at 1.3 to 1.8. Modern three-fold glazing, you can then also get to 0.7, 0.8, 0.9. The whole thing would then even be We'll later. You can rely that. Now nobody at and knows the U-value of their windows. Maybe you it clearly, but it's a simple two-fold glazing. But maybe simple glazing. But how I find out how good my windows are, are at home That actually to the window of all components in simplest way. First of all, construction year. If the window is still from the construction year, you know that. then you can make your first assessment about You the window yet. If the window was before 1995, it's usually not energetically. So 95 to the beginning of the 10s is already better. And yes, 2010 these three-fold heat protection glazes are the we in the renovation today. Then, was auch noch tatsächlich ganz praktisch sein kann, ist nicht ganz bei allen Fenstern der Fall, aber bei sehr sehr vielen, wenn man in den Rahmen guckt und zwischen die beiden Scheiben schaut, geht natürlich nur bei zweifach und dreifach Verglasung, dann sieht man an irgendeiner Stelle, muss man mal runter rum ⁓ den Rahmen gehen auf diesem Metallstück, dazwischen immer mal was abgedruckt, wenn da jetzt zum Beispiel 1208 then this window in December 2008 and if you know how old that is, you the one you just said, of also somehow a very good assessment of If you then still have a lighter in then you can even say something about the glazing, whether the glazing already has heat-reflecting coating, that is called heat protection glazing or whether it still an insulated glazing. How exactly does that look like? I can in the picture, so I'll a link in the show notes. Depending on how many flames you by the fire extinguisher and what kind of color the flames have, you can derive It's a simple, two-fold, three-fold glazing, or it's a heat-protection glass or not. These are easiest things. When a window is hit, between the two discs, that is also a very clear sign for a weak spot. So these windows are usually defective. You should about exchange. Well, now I've heard lot, which reminds a bit of my own chemistry class, when you flames and colors. When would you say it's worth an exchange now? When is that a no-brainer? Yes, basically that applies to bit for all components, the special window. There are three arguments, three levels. Technically, economically and simply comfort reasons. Technically, should have a well-waited window, with 20, 25, 30 years of life expectancy and then you can definitely think about it, to the windows. Official life expectancy, as always Germany, a norm for 20 years. Often last longer. We have seen windows that 40 years old and they still in But principle, that is the life expectancy. Economically, of course, very much to the energy efficiency of the windows that are there. And there is a good In any case, I little bit about it. With buildings, in the mid-90s and older, pretty safe. Yes, but in terms it basically even so similar. If you still an old window, then the window is only in terms U-value, but it is terms of airtightness, because the window has been built So it's not even about that the window is not airtight to the window frame, but rather to the window frame as it is installed. Back then, no foil was and that's the airtightness is not so good. And that actually also ensures traction. That's a big comfort issue. And also probably the biggest argument for exchange. So, now I'll just say... That convinced me. I have old windows I'll them out now. I'm that it draws that I more in of and that I less energy costs. But what are typical mistakes that I can make and things that you in practice where you say, ah, that's maybe little too short-sighted? Yes, the classic is that I just the windows in my old building and then I have more living comfort. It likely also Functioning, then it's not only the question of how long because if you're in an old building now Where airtightness was ⁓ not yet a topic a window airtight installed can actually cause mold and that's why it's super important that you three points together in a context On the hand, window, which you would like to renovate because it doesn't work anymore, because you front of this window, etc. We talked it. The insulation of the facade and the air ventilation. Because if we had an airtight installation before and it airtight, we change the air circulation. And because we live in the building and always carry air into the air, you the moisture out of the ventilation. If you had that airtight in you don't have to ventilate because ventilation works automatically. That's energy-wise suboptimal, but from a construction-wise perspective, not bad at That's why you have to look at how it looks with the air humidity in the room. What about the temperatures on the walls? If I the wall as it is and maybe the window is not the coldest point of anymore, then make sure that so-called flood failure on my wall. And I can't see that means I can't actively ventilate because if you in the building and you see a in the windows from the inside, it's natural and you're But I don't that when it happens on the wall, If it on the wall too often, then it to crumble. So, long story short, good window alone will definitely you something. So that can actually even cause problems. And the big mistake is then also when you that windows can very cheaply and does attention to airtightness because then problems can arise if the whole thing is not installed On the one hand, energy effect lower and the topic of plays a role. On subject of and cost, I'll clothes on But now I'm interested in choosing new windows. What do I now? think we can relatively quickly. That's the subject of U-value. I understand that So U-W, the U-value of Windows, the window, say, entire complex. But what the other frame conditions that I have be when I a window? Yes, so many people like to at the material Plastic, wood, aluminum, wood, aluminum. That's a factor that has an influence on longevity of the window, on the flexibility of if you can say I metal window or aluminum window in a building where windows are opened and closed. Maybe not always so carefully handled. I use wood is of course optically simply yes high-quality energy now no big factor if you now a wood window or plastic window otherwise yes that has be of course just to yourself to the building energy optically building physically maybe also legally there is a monument protection always such a topic that is I say that's what it's when it window selection. I actually what is still a topic is the topic of explanation. if you a multi-family house and there yourself maybe your windows even to the special property, do everything you want. You may not anyway. You may have an eye color or material. It can be that something like that written So maybe just as a truth for thought. That's what you should if you're in a case like this. Maybe just think But now I'm interested in of course I want to this. What does it What frame do I have to calculate? And what is of Frame is good keyword. It also on the frame. On the window frame in this case. Because the plastic frame is simply much cheaper. And accordingly, the window as a material is much cheaper. As far the installers there is no big difference. Wood is then already more expensive. Wood, aluminum or aluminum windows are more of a premium product, you can in heavily polluted environments. The price? 500 to 1,500 euros per window. Open to the top. If you have large sliding elements, they are much more expensive. Sliding elements are thick windows. where don't windows but just one window in front of the other. Then you a picture that you've probably seen And especially with triple glazing they can get very expensive. 6.000-7.000€ are there, no rarity. And that's how it depends on what windows you in your building or how much it costs. In a single-family house, this can also at 8 or 10,000 euros. And if you put value on qualitative, very, very long-term materials and you beyond the 20 years, then it will certainly become more That should least be one reason why my parents didn't at the summation of their single-family house. Wintergärten sind noch mal ganz anderes Thema, weil die stehen ja fast nur aus Fenstern und da fallen wir tatsächlich teilweise auch vom Glauben ab, wie teuer sowas sein kann. Also ein Wintergarten, 20 Quadratmeter für 100.000 Euro, habe ich auch schon mal gesehen. Das erinnern sich dann wirklich leistend. Heute aber sagen wir jetzt einfach mal For a family house, 10 to 15.000 euros as a framework to money is certainly not wrong. But costs are not everything. There is also funding. Is there any for Fenster? Of there is also for Fenster. Basically, let's start with what is throughout Germany. The over-regional funding or federal funding in the BEG. These are the usual 15%. That means ... If have costs of up to 30,000 euros at a single-family house, you get 15 % of If you have an ISFP, annual renovation plan, then you get 20 % and the funding increases to 60,000 euros. Yes, honestly, you won't use but as I said, you should least Let's if it's also useful to the facade. It's that's always nice to be combined because you can then plan and implement And then there of course additional funding from But that depends on the state of Now is one topic, which house to renovate. We just left the old family house. Now there are really, so I this here or so I've it a few times, a family house that is really older, which may also more special window elements or whatever they are designed What are the topics and challenges in old construction that you as a owner should have heard? So one topic that has a bit on it is building physics, nature, so ... We are very dense windows into an old building and you have to few things. On the hand, is a of heat bridges. We might get suboptimal temperatures on the heat bridges that could provide for mold. Is it maybe also meaningful? That depends on how big the object is, how many people live to ventilation measures. Can be an air conditioning system, but can also be a window fan. And then the question is, old construction is extreme cases a monument protected building. There we are in the rule. The selection of the windows is often limited. wooden windows are prescribed. Not always, but often. And are That means I can't just one disc, but I have a certain division with sprockets. They can set or can also The requirements are always by the Memorial Protection Agency or other sustainable construction materials. The construction agency, depending on the area, is I've always wondered how to windows properly. There may be a reference window, but you rarely find So are there standard sizes or norms to in the window builder? Or is it just matter taste that fits so that it fits? Yes, there are standard sizes, but that's not always the case in a existing building, not even in the monument-protected building. It's also about completely different forms that are today, not least for cost reasons. There are round windows with round curves at or even completely round windows. When it to measuring, it's not that complicated. The width of opening and the height the opening are Width is from body to body. Window body is the you at the window, which is this wall part next to the window. And then the height of the opening. There, of course, only a role A roll-out box is planned in which place it be visible Usually not visible but can also occur. Yes, that plays a role. Usually the window is always little smaller. A little smaller then ordered. There is then, ... Many people afraid of the bigger construction site, especially when to If it be hot, I would week without my windows in the house. It's very uncomfortable. How long it a window? It doesn't forever. If I a multi-family house, it takes longer. If I a single-family house, it three days. The is as follows. You first look at the current state. You plan which windows should be installed here. accompanying measures, reasonable, requested, budget, etc. When the windows are I said, then the whole thing is already commissioned and the funding is applied with a delay, of course. The windows are installed, old window out, new window in, that's a quick number. One window, two men, hour, one and half hours and then there is In the end, course, a receipt, a bill, a funding agreement. With the bureaucratic part, the size and so on, a family house, a month. A month and half, and from one to three days, a craftsman at home is not a bad deal think. No, so that's a simple measure. we the facade insulation now, it will course take a few days longer. But the window renovation alone is small-scale measures. And you don't to take That's a good thing. So we can at and get the windows repaired. So everyone can the point from the If you to an end, what would be your most important message on the window repair? Well, would say windows are an effective lever and also actually a lever that not only energy efficiency and less energy needs, but also changes the comfort of This has to be planned and considered in the overall context. Accommodation measures be necessary or useful. A few words from me. My name is Michael Suhr. am the founder and manager of Reneva. We Reneva know how complex energy restoration is today. full labor calendar, countless technical possibilities and a driving jungle that many owners rather stop than motivate. This is where we start. We connect energy consultation, qualified labor operations and digital processes to a clearly structured system. For your budget, we develop the best possible restoration for your property. We you highest possible funding and accompany you from the initial analysis to the implementation with only one permanent contact partner. If you want to what your real estate useful, then start the first step now. Visit us at renevadi.com and arrange an unconditional consultation.