Latest / RENEWA Sanierungsnavigator / Blower-Door-Test: Wie dicht ist dein Haus wirklich?
Transcript
- Oliver: Imagine you heat your room to pleasant 22 degrees in winter, but the same time are everywhere in the house. That sounds crazy and that's what happens in many buildings if they are not built and that's usually the And this is where the so-called blower door test or airtight heating test comes play. We this very briefly when it was about energy consultation with and what they actually do. and what the topics are. This is the why I thought we would continue to what it is, what it is and how to use The test can be found whether your house loses energy, impregnates moisture into the construction or creates But let's with what airtightness Many people confuse airtightness with non-breathing activity. But a house doesn't have to breathe, people breathe, windows ventilate and ventilation systems provide fresh air. A building should, the hand, as controlled as but not uncontrolled. If warm air enters through small cracks, something physical Warm air can lot of And if it continues cold components, even more and some point the air can the moisture. Then condensation water If you the comparison little easier, could say that this the same effect as with a cold drink bottle in summer. On water drops Only the whole indoors and that in the of the evaporation. The consequences are the evaporation loses its effect, the heat is lost, mold can arise, we have already about moisture here more often, and other moist damage can occur. And an airtight building cover prevents exactly that. But does a blower door test work now, with which you test First, by large frame in special foil in door. And the middle of sits powerful fan. And then the following In step 1, planned openings are closed. means ventilation openings, dusting, chimney, certain shafts, of course also windows, of course. Because we want to measure unplanned legs In step 2, we a underpressure. That means the fan sucks the air out of the building. This creates an underpressure Imagine the house is to be vacuumed. The outside air now to through each small opening. means sockets, window connectors, pipe connections, roof connectors, cable connections and so on. And of course you in step 3. That means these leaks are visible through smoke pens, fog machines, thermography cameras, air flow measuring devices. You can how the smoke is into small cracks. The technique behind this is the most important value, the N50 value. It describes how often the air in a building per hour at a pressure difference of 50 pascals. 50 pascals sounds to many people, for some it sounds little. For comparison, corresponds to the pressure that at a wind speed of 30 to 35 km h on a building. So, to give you an example, if a a N50 value of 2.0, then that The air in the building is twice per hour The adjustments are normal building, has a of 3 hours, building with ventilation system, value of 1.5 and a passive house maximum 0.6. So the smaller the value, the denser the building. But where do most the impurities These are course roof windows, are connections of steam brake or foils, sockets and outer walls are also a classic, cable passage, Roll-up boxes, if they are not dammed, transitions between wall and roof, pipes, cobblestones. critical are always transitions between components. To the building tight, different materials are now used. A steam brake, for example, has heard This low diffusion resistance, which breaks the moisture and thus drops accordingly. A steam barrier, which is almost completely tight, hardly water vapor through. There, course, the value is also significantly higher. Then there are wet variable foils. This is the intelligent variant, one could say quite simply. In winter, the moisture is in summer it up more and allows for dryness. And it's really interesting when you the experts when they talk it. Because holes of only one millimeter wide and one meter long can really lose astonishing amount of air Even the leaks can the energy consumption of a house. Passive houses are partly so airy that you could almost think that the building is sealed. get fresh air, but controlled by ventilation systems. That means controlled living space ventilation. The Blower Door Test is so sensitive that sometimes even air movements can light switches or sockets. So a Blower Door Test is more than just technology gadget for rebuilding. It really helps to save mold, heating costs, damage to and really also to living comfort, is a huge topic. And that's maybe the important thing. You don't see the air, but its effect every day. If you to know about how an energy advisor works, what it costs and what does, you can more in the links and also the podcast with Alexey in the show notes. And if we should you such lags or to clean up and repair then we you too. You can more information in the show notes.