If you have a 50f ac vent meeting 80f steamy air I don't see a paint fixing it. Of course you have to be careful because you are not exactly coming into the situation with no bias. outdoor temp of 24.7 C and outside humidity of 82.2%. trickle vents) fix it or or would passyfier air vents be better to solve the problem? Once the humidity level in the bathroom gets to 100% it doesn’t matter what the wall temperature is, you’ll get condensation. I think the units are over sized for new construction. But he didn’t do any official testing. That would imply at least an R-19 insulation. Start with data to define the problem. If you are on a slab, I would also try to get some definite answer about if a vapor barrier was installed. The water is a byproduct & contaminate from burning a fossil fuel. Condensation From Uninsulated Ducts The problem: If your air ducts primarily run through the attic, keep in mind that many attic spaces are not insulated. This is our 3rd summer in the house and so, we’ve dealt with many troubleshooting session with the builder and his various subcontractors. My first thought was ductwork poorly insulated (esp boots at vents). If you are lucky, maybe there is a similar company near you. Have any of the HVAC professionals seen all the condensation? Wall Vents for Condensation Mechanical Heat Recovery Ventilation (MVHR) is a relatively new phenomenon in Ireland but well established in other European countries. I could be off with that number. Perry Fireplace Creations. Condensation is the most easily fixed type of damp problem. Shedding water and venting air, weep holes are healthy escapes for homes, A dryer vent specialist shares what to do — and what to avoid — to keep things safe and efficient, Feeling boxed in designing around your mini-split air conditioner? It got into the bedroom through that tray ceiling gap, finding those nice, cold air conditioning vents. My company has tore out & replaced 100's & 100's VENTFREE ,UNVENTED & NO VENT WHAT EVER YOU WOULD LIKE TO CALL THEM over the years. I know the vent pipe travels vertically for about 7 feet through the attic and out the roof. The general guideline is to keep humidity below 60% in order to avoid mold problems. Install a roof vent. If you take outside air and warm it up like you would do in the winter, then the relative humidity should go down. Set the thermostat where it is comfortable for you. That is a lot of moisture. Moisture content of wood has to be below 16% to never see mold. Seble, we have had multiple things done which helped with it and it seems to have gotten better. Your readings could be off, but the fact that the measurements are close to each other is disturbing. But we do have soffit vents and they are clear. So, I’m hoping that that’ll resolve the issue permanently. Last year we moved in to our new construction home near the coast of NC, and the summer brought issues with condensation around the air vents in my son’s bathroom upstairs which eventually led to mold growing around the vent and even under his sink inside the vanity. When this is the case, warm, moist air from the bathroom can condense on the inside of the cold duct and can run back down into the bathroom. How do you make a home tighter? Buy a few AcuRite humidity gauges from Amazon. You do have to take on the role of Owner and lay down clear expectations and deadlines. OP, do you know if your home is negative or positive pressure relative to outdoors? You may be experiencing excess moisture coming up from the foundation. Poor insulation can cause condensation to build up within your system and drain via the AC vents. One take home message for me is that nothing short of a dehumidifier will work 100% of the time. "I think the builder's HVAC contractor is clueless as to what is going on.". Fast forward to present time: we have had multiple things done in attempts to fix this issue. (I once regularly put a common box fan in a conveniently-sized laundry basket to blow air vertically.) If I had to guess at a percentage of the residential fan dampers that work as intended, I'd say it is a shockingly, to most, low number. If you’re serious about stopping condensation in your van you’ll install one or two electric roof vents. Here is a blog post that explains in more detail: https://blog.inviair.com/blog/diffuser-condensation-is-a-serious-problem.-heres-what-you-can-do-to-avoid-it. Never had them down there. You can go to our web site www.fireplacecreationsbybmc.com and see a big pile stacked in front of our showroom that we tore out & replaced with direct vent gas products in 2015 . Dry clothes outside if possible. The attic has a higher temperature (which you would expect from solar gain and radiant heat) and a higher relative humidity (which you would not expect). If you don't have a window open, the only other thing happening to you, is that the air is warming to the dew point, before it leaves your vents. Maybe you just reshingled your roof, but for some reason, you discover a leak in your attic. New construction with a properly sized AC should be able to be below 50% even on hot humid days. The colder the air is inside the duct, the greater the chance of ductwork sweating. But they were nice enough to correct it (very nice in my opinion). This leads to the air cooling quickly and forming droplets on nearby surfaces such as walls/windows. The structural engineer that came out to do his assessment said that that room is a weird oddity. Motorized and pneumatic dampers work better but are a lot more expensive to install . (Taking off the cover and reinstalling it in a way to hold the plastic in place might not be difficult.). How to Tell the Difference Have you noticed a water stain on your ceiling but cannot figure out where it came from? There are sizing guidelines for all Vent free products that are usually never followed. Klem1 is right that the builder is trying to wear you down so you will go away. They work by allowing damp air out of your home and clean dry air back in. I don't have the answer JC but am posting so that I'm subscribed to this thread. I understand that black mould is caused by condensation and I know that increasing ventilation and not hanging damp clothes out to dry will help improve the situation, but this is quite hard to do in the winter, in a fairly small house with few places to hang clothes. Good thought and question about the plumbing, Jake. isn’ there an active thread right now about humid outdoor air entering through a bathroom vent duct? None of my other vents had condensation. I cannot tell if it’s a moldy smell or a smell coming from the unfinished room off the hall (that has HVAC ducts and insulation but no drywall etc). You can also GOOGLE dangers of vent free to do more research. This is the wall of the bathroom. Its main bonus as the name suggests, is it systems ability to recycle your home's generated heat while providing fresh air in … I was just giving an example as to where air infiltration can occur. Would ventilation in windows (e.g. After that, I called them back for an engineering consult. It is not hard to hit in daytime in summer months, with large solar radiance loads but at night and in the shoulder seasons, more of a challenge. Thanks fir everyone’s input. That can cause air to be forced outside via small leaks. Put one on each floor. Find out how to get rid of condensation, including … I read online that it should stay somewhere between 30-50% for comfort, and anything above 60% puts you at risk for mold. This basically means you live in your chimney. As the saying goes, when you've only got a hammer, everything begins to look like a nail. This is a whole house issue and not just the bathroom. The good news is that the crawlspace might be constructed properly for the climate. I didn't see if you stated the size of the AC equipment and if it short cycles. That will cause makeup air to be drawn in somewhere else just like leaks in supply ducts. The second issue is insulating the AC in the attic - along with the condensate line. They actually did a load calculation but the owner of the HVAC company had a stroke around the time the order for the units was placed, and apparently they had put down original “guesses” before the load calc was done. ITS JUST COMMON SENCE DONT BE FOOLED BY ALL THE BAD & MISINFORMATION THAT IS OUT THERE. How is the drainage around the house? This is what I found with my humidity monitor: All bathroom vents go outside to the sides of the home (vents with flaps that close when the fans are off). That was done at the very end of May before our year mark June 1, and he said it was very low humidity down there and almost the same temp as inside the home (humidity was well below the concerning threshold), and said we would likely never have issues with it. In older homes they are often riddled with holes from added wiring, can lights and more. Sometimes in humid areas, a dehumidifier is incorporated instead. That is when the air conditioner vents sweatingand condensation will form. They represent the kind of thing you can look for when boning up on humidity control in humid environments. The cool air left the vent into the crawl space may give another clue to. 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