White stuff on flue pipe My husband installed a new gas furnace. Upvote Jul 28, 2018 · Once in while the powdery crust on a pipe is not galvanic corrosion, it’s efflorescence--which is the residual minerals that water leaves behind when it dries up. Anything that cools down the flue gases like long lateral runs, oversized venting, venting through cold areas, etc will produce condensate dripping issues. Corrosion… most likely caused by wind driven rain leakage past the rain cap. Be sure to check your humidifier settings as well. The flue gases exit the exhaust pipe and get dumped outside your home. Published on: 2023-04-19 Dec 11, 2018 · About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Hello. Last edited by swedespeed7; 04-30-22 at 04:19 PM . It is caused by moisture condensation on the interior walls of the chimney and metal vent pipe. If your HVAC system is new, the dust problem can be even more upsetting. If your HVAC system is new, the white dust may be the remnants of some oil or other White powdery substance on 80% furnace that I installed about four years ago what’s your take? The inducer had a lot of white crap in it that I got out of it. Call Us Chimney Repair, White Stuff on Chimney. As the gas undergoes combustion, the flue gases flow through the heat exchanger and exhaust pipe. While the white salt on the surface is relatively easy to remove compared to other stains, further investigation must be done to stop the water leak at the origin and prevent structural damage. This is not a secondary stove and no cat. When I arrived I could see both furnaces were running from the steam. The top runs about 700* Up to about 900*. Mar 19, 2008 · The “white stuff” (most likely) on the vent pipes is a result of ventilation problems / possibly clogged chimney. Excessive moisture on walls or windows in areas with natural gas equipment. Pipe section somewhere is backwards allowing it to leak out. Mar 28, 2006 · PVC piping in close proximity to the flue… 6 " clearance for a singled wall flue to combustionable material… If this were products of combustion (which is also white-ish curly flakes ) then you should be reading a lot of CO at operation of furnace… and smell aldehyde’s (rotten socks )… Jul 1, 2022 · What exactly is this white powder on the furnace vent? It is combustion by product? There was an opening where a rivet or screw went. One of the clearest signs is a white powdery “precipitate” built up at the joints in the pipe At any rate, some of the gooey zinc hydroxide will turn to powdery zinc oxide while it’s still inside the vent, and some of this powder will be caught up in the slipstream of the draft from the heating appliance and will be carried up, discharged out the vent and deposited on the roof, and this is why you see white residue on the roof below Sep 10, 2009 · White stuff on soil; Flue pipe; Trained Chimpanzees Install Flue Pipe; John Thompson Shelter Works Home Inspections, LLC Missoula, MT. I burn a hot fire and only Oct 10, 2022 · The exhaust pipe is attached to the inducer fan. Mar 4, 2022 · It is alarming when you discover that your HVAC system sends some unknown white dust into your home through the vents. Noticed today in the S/P just below it some leakage for the seams of the S/P white powder little bit there. The baro is screwed on and sealed shut, and the flue pipe can't pop out of the chimney base. com. I'm reading you could install a liner. Can clog things up though, so have your furnace cleaned and inspected every year to keep it under control. Not burning hot enough while smoke is present is the cause. Sep 10, 2009 · Today I found a white powder below the flue for a gas fired furnace. With no clear understanding of the material and whether it is hazardous or just annoying can lead to panic in some cases. The white is sediment from the galvanizing and the red is the rust of the metal after the sacrificial galvanizing is gone. It's a very very sticky black tar leaking from the joints on my stove pipe. Segments of one sample of older Schedule 80 PVC pipe (15 years in-use) showed significantly higher apparent accumulation rates of VC than younger Schedule 40 PVC pipe (2 years in-use) or new pipe. Update Well my friend got back to me on this, Here is his reply: The replacement pipe on my water heater is gray rather than white, it looks like the pipe was cut right where the printed info/data is, but it states…. Shop the latest White Stuff clothing. Learn about what causes white staining and what to do. Before that happens, I usually have to take the vent apart and dump all of that stuff out of the horizontal pipe and vacuum it out of the draft inducer part of the furnace. The visible salt residue is a sure sign of water leaking into the stone structure and if left alone, can cause serious damage to the structure. That can be dangerous if the flue gas isn't vented properly and afaik that white stuff might corrode your duct which is also not great. This is a common experience for homeowners with masonry chimneys, especially very old ones. Regular inspections of home furnace flue pipes detect any potential issues early on, safeguarding indoor air quality. Can anyone tell me what it is and why it is happening? He tasted it and it made his mouth numb. Over time, minerals and other impurities in the water can settle at the bottom of the tank, forming a layer of sediment. If your HVAC system is new, the white dust may be the remnants of some oil or other I see it all the time. It's non-toxic, and fairly common. ?? Feb 14, 2021 · I have no idea what the actual fire temps are, but if I crack open the lid during the burn, there are swirling blue/purple/white flames quite often. (781) 893-6611. Nov 8, 2022 · White powdery stuff on pipe Jump to Latest 7. Sometimes so much that the exhaust pipes have actually fallen completely apart and the exhaust is just pouring out into the crawlspace below the house. May 2, 2023 · The white residue or crust on your water heater connections is often a result of sediment buildup inside the tank. The exhaust gasses from your appliances supposed to be carried out to the exterior through the chimney. It can also prevent dangerous com May 23, 2018 · I can’t find much information about what is causing this white stain on the asphalt shingles below the HVAC flue exhaust on this roof. You don't want a backfire blowing the pipe off and having an uncontrolled fire. It is damaging to the appearance of the steel, not to mention to the anti-corrosion layer of zinc that protects the body of the steel. This white stuff has been collecting on the flue. Dec 12, 2011 · Flue colours? White? JohnB2416; Oct 8, 2024; Gross white stuff building up on outside of new steel liner letsbewarm007; Dec 5, 2024; The Hearth Room - Wood Stoves Shop Menards for a great selection of pipe and fittings for all of your plumbing needs at the best prices. In any event. To know what to do about it, it’s important to understand what causes that white staining on your masonry or brick chimney. com team in our mission to provide you with technical advice and first-class service in the UK to keep your home safe and warm. That happens when the temperature of the flue gases drops too much before exiting out the flue pipe. 09-10-2009, 04:42 PM #2. The flue thermometer reads about 300-350 and we reload around 250. Any ideas on that as well? Similar Threads: ABS Flue Pipe on LP Water Heater; High Efficiency Flue Termination; White stuff on soil; Flue pipe; Trained Chimpanzees Install Flue Pipe The original question was about white powder around the combustion chamber. Harmless in the liquid state, but when baked on flue walls becomes the various stages of creosote. For gas and oil water heaters, flue pipes are not just a safety feature but also contribute to operational efficiency Jan 6, 2015 · Cool flue temperatures. Nov 5, 2016 · So I noticed this dripping from my stovepipe today. In the case of extremely low flue gas temps, moisture could be from condensation in the Once it reaches the surface, the moisture evaporates, leaving a white, powdery residue that is zinc oxide. Any help/insight is appreciated. If you can get to where your furnace flue is, look for signs of moisture. If you are seeing white on you chimney's bricks, this is called efflorescence. Here's how to handle it. It is just oxidation from the galvanizing. Sep 5, 2024 · Efflorescence, a powdery white substance on bricks, can indicate a serious problem with chimneys. (I know, a pretty stupid thing to do!) Thanks in advance. The picture shows the top of the cast iron heat exchanger with very clean flue passages. This is a double wall pipe which will protect the flue temp until it goes into the chimney. Nov 11, 2014 · Learn more from Doctor Flue today! Request a Quote Call Us: (800) 438-3583 . At any rate, some of the gooey zinc hydroxide will turn to powdery zinc oxide while it’s still inside the vent, and some of this powder will be caught up in the slipstream of the draft from the heating appliance and will be carried up, discharged out the vent and deposited on the roof, and this is why you see white residue on the roof below In this 3-minute read, you’ll find everything you need to know about that white stuff you might be seeing on your chimney, also called chimney efflorescence. A very slow leak, one that evaporated at about the same rate that it leached out, created the flaking white powder crust on the CPVC pipe above a water heater shown in the photo below. Put the thermometer on pipe at least 18 inches above stove and keep the temperature in correct range while smoke is present. 69 KB Feb 19, 2010 · What is the white stuff and/or how is it formed? A form of efflorescence perhaps? Additionally, there was some on the B-vent joints in the attic. if not present in this area but is in the other regions you mentioned , check flue if applicable , or log position , flame should not directly contact logs , at least not Isn't the white stuff on the chimney on the side with the incinerator/now WH flue? From the location are you sure it isn't now or wasn't from the gutter spilling over and running down at some point? Bricks and mortar really don't like that. BTW, I know nothing about hvac, as you can tell. With that said, if the stuff on your basement wall looks and feels like salt, then it probably is not mold. Other Causes. Jun 22, 2014 · Also, make sure every flue pipe joint has 3 screws in it. If you’ve noticed strange odors in your house when your heat is on, or lack of airflow in your house, it’s best to inspect your furnace flue pipes. I just cleaned my pipe and installed a new liner less than 2 weeks ago so everything is clean. HVAC-Talk: Heating, Air & Refrigeration Discussion Just installed a W/M Gold going up through a garage direct vent SS 2 feet below roof line. Ideally you should get someone in who's more experienced with gas boilers. 10:00 am, 23 degrees F, clear and 64% humidity. One should be attached from the furnace to the wall. Feb 5, 2021 · You discovered white stuff on your bricks. Apr 21, 2013 · Looks like the remains of condensation from flue gases that reacted with the zinc coating of the pipe, dripped back down to the furnace, leaked out then evaporated leaving the zinc compound - the white stuff. ”@ 180*F made in USA 11:40 07/14/08 8”-The old pipe is nearly impossible to read though it does have lots of printing on it Nov 22, 2005 · Gas and Oil Home Heating Furnaces - White powder forming on duct work - I’ve posted this in the Duct system section, but also thought I would put it hear as well, as it may be caused by the furnace. Welcome to the Green Building Forum. I've seen it before on jobs but those were older boilers This is 2 months old. When the temperature inside your flue is cooler than normal, smoke will condense, causing creosote form on the inner walls at an accelerated rate. BTW I have a two flue chimney with a Kernerator in the other side too. Reading any of the public conversations is free but if you want to join in the discussions then you need to register first to obtain a code for which there is a small charge. Didn’t see any signs of rusting or damage elsewhere. . The inducer fan creates a draft through your furnace’s combustion chamber and heat exchanger. 2. Their light sheet metal construction helps to keep the interior flue temperature abnormally cool. The first worry is CO spillage. HVAC Buster | Get Your HVAC Done with Professional Guidance. I would imagine the higher the flue gas temperature the less condensation. There is a white powder that covers the part of the cast iron that was not covered by the flue collector box. Boiler looks good an clean. However there is no picture of a combustion chamber. Just in a one of the joints. Operational Efficiency. My system is set up as to cold start so the flue temperature can go down to room temperature if it is warm outside. Apr 19, 2023 · My expertise has grown throughout my long career as a renowned chimney flue consultant in the UK, Germany, and France. Now Learn 3 Ways to Remove Efflorescence from your chimney or other brick masonry surfaces (913) 642-6171 [email protected] Proper maintenance of these home pipes prevents blockages that can lead to gas leaks. (Plus, your nose can usually alert you to a moldy smell). Metal chimneys are very susceptible to creosote buildup. Below the zinc the acid then dissolves the iron in the duct. 621. Efflorescence is a white material that appears on brick as a powdery mass of mineral. This sediment can then make its way into the pipes and connections, causing the powdery crust to form. A byproduct of the reaction between the flue gasses, and the zinc coating on the galvanized flue pipe. Dec 29, 2013 · Chalky, white powder on a chimney or exhaust vent pipe or soot build?up around the exhaust vent. Discover clothing, footwear & accessories with free UK delivery on orders over £70, or Click & Collect from your local shop. I am thinking the hot flue gasses are condensing on the flue cap and then running down the pipe and freezing. Oct 28, 2018 · “White rust is a white powdery deposit formed from a natural corrosion process that can occur on any new zinc coated steel product. au White-Rust-White-Paper-200531. I know it's creosote but my question is why. In the dynamic study, contact time (up to 8 hours) and water temperature (up to 40ºC) both elevated the levels of MMT and DMT in the water leaving Jan 29, 2021 · The mold is likely to show up in your crawl spaces or as a white stain on your basement walls. Since turning on our heat this year, we have been noticing a white powder forming on the galvanized duct Mar 26, 2021 · I Have Rusty Furnace Flue Pipes. Efflorescence occurs when moisture moves through concrete or other masonry. Zinc hydroxide is a sign of inefficient or incomplete venting of the toxic products of combustion and when you see it, you should look for other signs indicating backdrafting. Feb 19, 2010 · What is the white stuff and/or how is it formed? A form of efflorescence perhaps? Additionally, there was some on the B-vent joints in the attic. In the case of extremely low flue gas temps, moisture could be from condensation in the Jul 5, 2008 · I haven't been brave enough to try the thin aluminum pipe on a furnace yet so I still fight the "salt" on those and it does, eventually rot through the pipe. Furnace flue pipes aren’t always easy to see. Nov 22, 2005 · Gas and Oil Home Heating Furnaces - White powder forming on duct work - I’ve posted this in the Duct system section, but also thought I would put it hear as well, as it may be caused by the furnace. Jan 30, 2009 · The acid dissolved the galvanized coating in the flue pipe and you get zinc or zinc oxide. White powder coming off the flue is zinc oxide. Back in the day of stack switches with 90 second trial for ignition, this happened more often. Some staining around tape. Since turning on our heat this year, we have been noticing a white powder forming on the galvanized duct Jan 7, 2022 · This morning’s inspection. Sometimes the flue will condensate when the flue pipe is way oversized, like 10" for a water heater and 75k btu furnace. As I approached the front of the house I could see ice on the flue pipes. I’m curious about what the cause is and whether it is a defect that should be monitor… Nov 30, 2015 · If you’ve noticed a crystallized white substance or a whitish (or even brown, yellow, or green) powder around your chimney, you’re not alone. Bookmark the permalink. It really should be removed and replaced (the flue pipe) and replaced with "b" vent. Another might be on your roof. Any ideas what this might be? Would post the picture, but I'm having trouble resizing it. The ash looking crumbly stuff in the flue is most likely from lack of combustion air causing the appliance to not fire at a consistent temperature or like you guessed, improper draft. 6K views 30 replies 5 participants last post by Matt1963 Nov 11, 2022 Jul 27, 2007 · look on your burner tube itself , around the orifaces in the tube where the gas comes out , if there is a buildup of this stuff there then webby is right , clean with alcohol (non drinkable mind you ) should remove it. I’m removing the furnace it’s a downflow installing the AC Apr 30, 2022 · EDIT: just checked inside the water heater and now I see lots of this white stuff coating the inside of the flue and collected at the bottom. Knowing how to visually inspect your flue pipe is an important aspect of furnace upkeep and maintenance for all homeowners. ” orrconsteel. Mar 22, 2012 · The vent size is chosen to be able to channel the total btus that could ever be produced at one time . If the humidifier is turned up too much, this can also cause moisture build up on windows and walls. 1999 goodman furnace. Not all of white stains on bricks are caused by Efflorescence. Today, I lead the flue-pipes. pdf. The moisture We would like to show you a description here but the site won’t allow us. yjp jbbh lammlvk nwsldw lnq hrynzo zinlj vxuzrki hneb matwr