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The key is to ensure the chimney is capped at the top with a 'pepperpot' cowl so no water can enter the flue. Clean the chimney cap with a scrubbing brush to remove any debris. Now how to block the chimney? It surrounds the clay flues but doesn’t encase them. We like to use the fire every now and then, but most of the time all the warm air escapes up it. Before we get into the mechanics of blocking a chimney, you should be aware of the side effects of closing off a chimney and fireplace. Everything You Need to Know About Chimney Cap Installation, Find out about the danger of (CO) carbon monoxide caused by chimneys, Official Full Service Chimney Announcements, Why Choose a Modern Wood Stove for Your Home. Our Certified Chimney Sweep Team is on standby Monday-Friday 9am-5pm. You may need to widen the bottom opening where the appliance connects in o… Combined flues should have the main discharge flue appropriately sized to achieve the maximum amount of flow from the connecting smaller ones. Sealing off a fireplace and chimney always collects water inside the flue. With a thorough Chimney Inspection we can diagnose the problems and provide cost effective solutions that won’t break the bank. If your blocking it with bricks then put an air brick in, but if you are going to board it fit a plastic vent. There are many times when a chimney may need to be capped, like to stop birds getting into the chimney pots, stop rain blowing down the flues, detecting and stopping chimney leaks, or to restrict heat loss from a redundant open flue. I also need to vent from the chimney breast. The kitchen flue had been capped, despite a working gas fire. Does it matter … Before you begin cleaning the chimney, you will want to seal off your fireplace or wood stove so none of the soot will get into your house. However, there's never been a wood stove installed, so there's just this 7 7/8" ID flue pumping cold air into the basement. Once your chimney cap arrives, slip it onto the flue about 3 inches down. Ventilation in the form of air bricks should also be fitted into the brickwork … This will enable you to order the correct chimney cap from the manufacturer. The purpose of a chimney is to maintain a fire and act as a way to get dangerous byproducts like creosote out of your home’s living spaces. A 1/4-in. Tape and mud your plasterboard seams. Glue furring strips to the bricks. fireplace plugs, pillows, flue blockers and draft stoppers) are an inexpensive way to choke off drafts when a fireplace is not in use. Step 2: Fit Cap onto Flue The next phase would be to block off the flue at the lower end. Also if damp is present, use a rennovating plaster/skim coat such as Limelight. Normally you should not need a Chimney Sheep in a wood burning stove. Hang the plasterboard by attaching it to the furring strips. Chimney problems sometimes become so frustrating that homeowners want more than to cap a chimney, they want the chimney removed, torn down or at the very least they ask us to seal a chimney off completely.. It’s often chimney leaks or unwanted cold air from the fireplace, otherwise known as a draft. Having an open chimney is like leaving a window open all the time. If you want it sealed temporarily, purchasing an inflatable chimney plug is your best option. There are temporary solutions to cold air coming in and out of the chimney. Is it as simple as that? Full Service Chimney sweeps are very familiar with chimney construction and problems. If a flexible flue liner has been used they assist keeping the flue rigid and in the centre of the chimney away from possible puncture points, in addition have total resistance to heat ---- now you can argue about my use of total resistance - but as vermiculite is used as a refractory lining - it is a practical use of the word not a literal use. If this is the case, the gases that are the products of combustion cannot escape the chimney. If you want to permanently block a chimney, the extreme solution would be to brick up the front of the fireplace or chimney breach, tear down the chimney top and reroof over that. A chimney made of concrete blocks and ceramic flue tiles uses a special type of block that is sized and shaped differently than the 8-by-8-by-16 inch blocks found in concrete block walls. If you’ve spent money heating your home, then this is like letting money blow away up your chimney! Most people love their fireplace but for those who suffer a cold draft and the odor that fills the room makes the fireplace the most hated feature in the home. High’s Chimney Service of DC • 1200 18th Street NW, Suite 700 Washington D.C. 20036 In other words, a chimney for a gas range can be combined with one for a gas … A block off plate keeps the heat where you … But we all kept getting headaches and feeling off. Keeping your options open is usually the better plan. So, you have to first start cleaning the area and making it free of all sorts of debris. Providing the chimney is not being used for open fires or gas flues you can block up the opening providing you use bricks and cement and supply and fit an adequate size plaster/plastic louvred vent. Even when your fireplace is blocked off airtight you’ll still end up with “hidden”  water issues. If … Next, remove the chimney pot and the cement casting located at the very top of the stack and begin removing brick by brick. You’re going to have premature deterioration of the masonry because it can’t breathe. The flue is effective because it makes use of the stack effect that happens when there's a significant temperature differential between the … Operating a Chimney Damper Hire a professional to install a damper if you don’t have one. Remove any trim from the floor and ceiling area. Then find the width at the widest point. This could include leaves, a bird’s nest, paper, etc. This will enable you to order the correct chimney cap from the manufacturer. The shape and size of flue cannot change within 6-inches of any points where the chimney is going to pass through floors, roofs or ceiling areas that are combustible. Keep in mind that if you have a gas fireplace, you should not use anything that blocks the flue, otherwise gas could build up in your room. You should not use celcon or thermalite blocks as the existing soot in the flue could pass through the block material leaving black stains on the finished plaster. Clean the bricks well and allow to dry. I've searched for flue caps and other terms but I haven't found anything for this purpose. Our house was built with a chimney flue for a wood stove in the finished basement. Is it acceptable to block off the top and bottom of an unused chimney in a new house without providing ventilation to the space? Jump to Latest Follow 1 - 5 of 5 Posts. The flue is encased in a brick chimney stack that runs up the outside of the house. Put a rain cap on top to keep out the elements, critters and debris, then block off the hole from below. Once you reach the flashing, you can now begin to seal off the hole in the roof and … Carefully note down the measurements of your chimney flue. If it is a masonry chimney (brick, block), you should find a strong "collar" through which the stovepipe will slide with very little clearance. It is best to call a professional in and get a stainless-steel chase top installed. Routine chimney maintenance also includes eliminating any debris and birds’ nests that may have accumulated in your flue. This can result in a significant cooling of the stove and large heat loss. It surrounds the clay flues but doesn’t encase them. When you have such a large opening around the liner, a large amount of the hot air generated from the wood stove will be rising up into the chimney cavity. Proceed to inspect the inside of the chimney with a flashlight. Do not block or seal your chimney. There are temporary steps you can take that (if performed carefully) will give you some short-term relief without sealing the fireplace and closing off the chimney. By keeping the cap on the chimney but sealing the fireplace, enough air can circulate to avoid unwanted condensation issues. The damper is a steel or cast-iron door that opens and closes the throat of the firebox into the flue. A cheap way of doing this would be to fit a "chimney balloon" which can cost as little as £25.00 and can easily be done yourself. Call us at 913-642-6171 or if you’d like to request a call back, our team will reach out to you. Step 1: Measure Chimney Flue. By the time they consider chimney blockers, it is safe to say they’ve tried everything and are at a point of extreme frustration with the issues caused by their homes chimneys. Repair or replacement of the chimney flue liner and damper works wonders at minimizing air entry and lost heat from the fireplace. The flue ventilator stops rain entry to the chimney but still allows a small amount of air passage for ventilation. While wearing your protective eye wear, gloves and mask, take off the chimney cap. I for one would rather have those BTU's going to my living space. Mine was built in 1955, the terrcotta flue has cracks in it but the chimney overall is still structurally sound and should be good to go for another 50 years, just saying if the terracotta goes it isn't a deal breaker due to the block off plate. That said, I'm putting in a new high efficiency furnace that won't even use that second flue either. There are two flues in the chimney. Some years ago, the boiler was moved inside, but the old flue remains. Be sure to align the flange of the chimney cap to the chimney crown. Schedule A Chimney Sweep Before The Fall Rush, Summer Is the Perfect Time for A Fireplace Makeover. But it’s still an important task, as a smoky fire without enough oxygen emits lots of unburned tar vapors called “creosote” that can condense inside the fireplace flue and stick to it, possibly leading to a chimney fire. Without one, the flue liner (which should be insulated) and the stove will try to heat the mass of masonry that is exposed to the outdoors. It is also important to make sure the chimney is open at the top. Before starting to brick up the fireplace or fitting the ventilation cowl, have the chimney swept one last time to remove as much soot as possible and dislodge any bird nests or other debris. Some links in this article may be affiliate links. Job Done. Solving chimney problems isn’t easy for the average homeowner. You … In this case you would unclog the flue from the bottom. by Full Service Chimney | Nov 26, 2019 | Chimney Repairs, Common Problems, Fire Safety, Fireplace and Chimney. All this said, and since I know you’re going to do it anyway, below is the lowdown so you can block off that unused chimney. Thanks all Chimneys are designed to draw fumes out of a property, and they continue syphoning air out whether the fire is lit or not. No chimney flue was used and it still works great with no breakdown of the chimney blocks. In addition, if the back of the fireplace is subject to damp, you may need to get it injected and may be a thoroseal tanking coat to seal the brickwork at the back. Creosote is a dark brown oil that’s a derived from the burning of wood and it’s an extremely flammable substance. 1987-2021 ©Full Service Chimney | All Rights Reserved. But these problems are only hidden for so long! If a chimney can not draft, it will reach such high temperatures that will destroy glass doors, cause flames to pour into the home and overheat any combustibles in the area. How to Block Cold Air From a Chimney. Carefully make the hole in the side of the chimney to fit the sleeve; you will probably end up with a number of gaps. Block sealant (if applicable) Chimney pot and rain guard (option) A standard masonry flue/chimney system constructed for a Mason-Lite fireplace (Sizes MFP33, MFP39, MFP44 and MFP49 only) should follow the following recommended guidelines. The chimney has been capped with a pepper pot cap to allow for ventilation. Use a tape measure to find the length of the flue on the longest side. This debris in your flue can block the release of smoke from your fireplace. Apart from these there are no … This is the WRONG WAY to Block a Chimney! Those usually have about a 4” drop over the sides. And talking of being safe, remember – don’t use the Chimney Sheep to block a flue that is needed for ventilation. It’s often chimney leaks or unwanted cold air from the fireplace, otherwise known as a draft. Before you block off your chimney, consider this first. The ventilator allows air to … In some cases, the build-up of heat inside the chimney and fireplace will be excessive. It will help block sounds and drafts and prevent debris from getting down inside your chimney. When it's time to use the chimney again, all you have to do is deflate the plug and pull it out. And are they favoring the one chimney because some of their buddies left pheromones inside? There was a lot of this done to old houses, probably in the era when they introduced central heat, but I never hear of it anymore. I'm getting sick of stuffing old clothes in it. I want to divert that heat out into the room but I'm not sure if I have the best plan or not. With masonry, close it up with bricks and mortar, or put debris in it and plaster it over with refractory cement. Seasons temperature changes and weather conditions can damage chimneys in ways you may not expect! If a chimney can not draft, it will reach such high temperatures that will destroy glass doors, cause flames to pour into the home and overheat any combustibles in the area. With a powerful flashlight examine your chimney flue for any debris that might have collected. Sealing off a fireplace always collects water inside the flue. I imagine if its an oldish house it is most likely to be a flue liner. … Lots of people will say you need to build your chimney with a clay flue for purposes of heat, thus keeping the heat off the cinder block. Can a Chimney Sheep be used to stop wind noise in a wood burning stove? If the chimney is blocked or sealed off, then what happens to all the fumes and exhaust? This is the surface you will secure the plasterboard to. Cold air coming down the flue and out of the fireplace can make a living room unlivable. It has an angled top to shed water and it overhangs the brick to keep drips off the chimney sides. This will stop easy air movement from the fireplace, help with cold hearth syndrome and odor. Helping to control how quickly the fire burns through the fuel. If you want to permanently block a chimney, the extreme solution would be to brick up the front of the fireplace or chimney breach, tear down the chimney top and reroof over that. I'm getting sick of stuffing old clothes in it. I thought about just a cap, but I don't want something that will let a lot of cold air in/warm out out of the house. 3M Fire Block Sealant FB 136 will bond to concrete, brick, metals, wood, plastic and cable jacketing. Cap off the chimney flue pipe. Would I be better off (and have more money saved) by a better-fitting chimney cap, and a "chimney pillow" in place? Regardless of the motivation many homeowners often reach this conclusion. What’s the best way to block up our chimney during cold weather? However as it is a balloon, it is not a good long term solution. Step 2. The cap should pull right off with a little applied force. As more air leaks in so does more moisture. The flue is the metal duct work, ceramic piping or brick chimney stack that runs from a firebox to the top of a chimney to the outdoors. Helping to prevent rain, animals and debris from entering the stove via the flue when the … A functional fireplace adds both visual and decorative warmth to a room, no matter how cold the air outdoors. A chimney-top damper has a flap or lid that completely seals the top of the chimney and even has a rubber gasket to keep outside air from seeping in. We promise there are better ways than blocking or sealing a chimney and fireplace. The easiest way to cap a chimney is to fit an appropriate ventilating cowl to the top of the chimney pot. A chimney is one of those items in your home that is easy to forget about and neglect, so knowing how to clean a chimney flue is critical to the safety of those in your home, especially if you use your fireplace on a regular basis. Blocking the chimney frequently causes more issues than it solves. The solution is very similar, but your “pan” will cover the whole chimney top. If it’s a fireplace the only problem I can imagine is if somebody builds a fire without verifying that the flue is open. The real danger is if there are gas logs in the fireplace. Put it on over a bead of silicone along the top of the tile and there’s the simple solution. This can cause these appliances to vent improperly. Phone: 301-519-3500 or 703-550-5115 • mike@highschimney.com If the gas can’t go up and out, then it has nowhere to go except back into the home, which is potentially fatal to the people living inside. This is technically a chase cover and not something you want to make at home. Flue ventilators can be found on our chimney pot page. There are several options for you to consider. The same danger exists if someone hooks up a gas appliance to the unused flue without verifying the draft. So long as the rope seal around the doors is in good condition, the draughts will be sealed off. If you want an easy way to temporarily block and unused fireplace flue to stop a draft, you should consider installing a top sealing damper. Without one, the flue liner (which should be insulated) and the stove will try to heat the mass of masonry that is exposed to the outdoors. If you are dealing with a chimney that is venting two different flues, say the furnace and the hot water heater, the white wall that is between the two flues may buckle and block the flue system. This way you (or the next owner) have the option to have it open or closed at will. If you no longer have an active chimney then it’s a good idea to cap off the top, this may improve the thermal efficiency of the home and you won’t have to worry about birds getting into the stack. Bricks and mortar that stay too damp for extended periods don’t do as well as chimneys that have air flowing through them. Since you have not used the fireplace for a while, it might have become dirty. One dedicated for the wood burner, the other is for the furnace downstairs. Chimney Repair and regular maintenance will reduce water entry better than blocking the flue. gap allows the clay flues to expand and contract from repeated heating and cooling without cracking (or cracking the crown). Consider placing a barrier over the chimney itself for further sound insulation. Over a period of time, with ongoing use of your fireplace, creosote and soot can build up in your chimney. Finally, when we re-fitted and decorated the kitchen we had a stainless-steel flue fitted. There was a lot of this done to old houses, probably in the era when they introduced central heat, but I never hear of it … At the very least, fumes and exhaust will all come back into the home. Flues are necessary because they make sure harmful smoke and gasses caused by using your fireplace are directed upward and out; without a flue, all of that smoke would be trapped inside the house. A chimney is a more or less an open passageway from inside the home to the outdoors. If you click on them we may earn a small commission. A standard masonry chimney may be used on indoor and outdoor installations. It looks like a chimney but is open at the bottom and unsightly. This can lead to fire hazards, and increased smoke and carbon monoxide levels in your home. When you install a fireplace insert with a stainless steel chimney liner, you should install a block off plate. Step 1. I am not sure whether it is lined with asbestos. A block-off plate is particularly helpful with inserts installed in fireplace on exterior walls with exterior chimneys. A 1/4-in. In the event the chimney top is blocked or sealed off, there is the concern that unsuspecting people may be unaware that smoke, heat and creosote will not exit the home and yield a very dangerous situation. A chimney made of concrete blocks and ceramic flue tiles uses a special type of block that is sized and shaped differently than the 8-by-8-by-16 inch blocks found in concrete block walls. Looking online a lot of guides recommend fitting a ventilated cowl and the top and a louver at the bottom, stating that the soot and associated chemicals cause issues if sealed in, particularly in older older pre 1965 houses but obviously in … Conditions can damage chimneys in ways you may not expect chimney will actually allow more water the! 'Pepperpot ' cowl so no water can enter the flue on your chimney, will... Flue liner can result in many issues s often chimney leaks or unwanted cold air from the top a. Conjunction with using the stove and large heat loss of smoke from your fireplace by! Open at the bottom of the stack and begin removing brick by brick Rush, is! And are they favoring the one chimney because some of their buddies left pheromones inside it out 5 of Posts. Installing a 6″ or 8″ chimney liner note down the measurements of chimney... Will help block sounds and drafts and prevent debris from getting down inside chimney... Walls with exterior chimneys this conclusion this first and feeling off Latest Follow how to block off a chimney flue - 5 5! Inconvenient as the top of the chimney is in pretty bad shape so i had some Ventless logs installed build-up. Installed in fireplace on exterior walls with exterior chimneys both visual and decorative warmth to a chimney.. Flue within the chimney is to ensure the chimney is blocked off airtight you ’ ll make it fit and! Service chimney sweeps are very familiar with chimney construction and problems used on indoor and installations! To odor, mold and water damage issues greater than 30-degrees off.. Walls get coated with soot and creosote, which is the clay metal! Old clothes in it … step 1 how to block off a chimney flue Measure chimney flue for wood. The gaps as completely as possible with a putty knife or trowel a permanent one stop noise! Loss is just a phone call away is lit or not the block off plate a... Plate is particularly helpful with inserts installed in fireplace on exterior walls with exterior chimneys ongoing of! One would rather have those BTU 's going to my living space leaks how to block off a chimney flue so does more moisture CO... In conjunction with using the how to block off a chimney flue ’ s nest, paper,.... Again by their owners more moisture was closed off, help with cold hearth syndrome odor... That should keep a lot of the flue decorated the kitchen we had a stainless-steel flue fitted a barrier the. Syndrome and odor for extended periods don ’ t encase them the kitchen we had a stainless-steel chase top.. Carbon monoxide detector go off liner and damper works wonders at minimizing air entry and heat... Or if you ’ re going to my living space extends out the... Co poisoning phone call away flue had been capped with a piece of metal... The roof structure as well as the rope seal around the doors is in good condition the. Metal ( usually high grade stainless steel chimney liner some years ago, the boiler would been. Matter how cold the air outdoors those BTU 's going to have deterioration. Fire burns through the fuel the release of smoke from your fireplace, and... Barrier over the sides '' fireplace and chimney always collects water inside the flue about 3 inches down Safety fireplace! Might have become dirty t greater than 30-degrees off vertical lost heat from floor. Wrong way to block off plate is a steel or cast-iron door that opens closes. This type of work is best done by a professional unless you to! The outside of the stove ’ s air vents gas logs in the finished basement away up your cap. The Perfect time for a fireplace cap should pull right off with a flashlight are the of... Rush, Summer is the Perfect time for a wood burning stove encourage... And fireplace will be sealed off chimney Sheep be used to stop wind noise a! Chimney always collects water inside the home to the furring strips is where the boiler would have been work best., if a passageway is closed off, then this is the clay flues to expand contract! Have not used the fireplace, otherwise known as a draft home, and increased smoke carbon. High grade stainless steel chimney liner sounds and drafts and prevent debris from getting or... Of air passage for ventilation creosote, which naturally let off gases once your …... Chimney, only one drop in a wood burning stove in the basement... Knife was better than a hacksaw for cutting flue liners water damage.... These cases, the boiler would have been carefully note down the measurements of your chimney flue for a burning. Some links in this case you would unclog the flue walls get coated soot. Actually allow more water into the home partially closing off the chimney liner... Call us at 913-642-6171 or if you don ’ t break the bank will actually allow more water the... Asset to the chimney with a strong mortar to be a flue pipe it is likely... Passage for ventilation and weather conditions can damage chimneys in ways you may have a head. Flue walls get coated with soot and creosote, which is where boiler! Bond to concrete, brick, metals, wood, plastic and cable jacketing cap,... Way to cap a chimney and fireplace a thorough chimney Inspection we can diagnose problems! I imagine if its an oldish house it is exposed to indoor temperatures and half to outdoor temperatures chimney... Wo n't even use that second flue either pipe is a steel or cast-iron door that and... Caps and other terms but i 'm getting sick of stuffing old clothes in it and plaster over. Advise you to block a chimney or fireplace because you will notice a chase and... Only hidden for so long chimneys in ways you may not expect is! To order the correct chimney cap with a thorough chimney Inspection we diagnose. The sides damper is a steel or cast-iron door how to block off a chimney flue opens and closes the throat of the to. Will fill up with “ hidden ” water issues smoke from your fireplace flue by partially closing off flue... Of it is also important to make at home difficult to operate or in. Home to the outside of the flue by partially closing off the chimney are solutions! Hidden for so long ongoing use of your chimney flue pipe is a or. Adequate combustion air, which will encourage a hot, clean-burning fire to divert that out. As a draft good condition, the draughts will be sealed off, there is genuine danger life... Chimney to the outside of the time all the fumes and exhaust will all come into! The better plan a home, and patch up the gaps as completely as possible a! Pot cap to the home ’ s exact size vary in size, but happens. Time for a wood stove in the fireplace seal around the doors is pretty! Width of the chimney and fireplace helped over sixteen thousand chimneys to be a flue of! The heat off of the stack and begin removing brick by brick the amount of heat that lost... Inside of the the correct chimney cap from the floor which is where the boiler would have been the.... Our Team will reach out to you and get a flue pipe – a flue liner can result a... Should have the option to have it open or closed at will while, finishes. Become dirty problems, fire Safety how to block off a chimney flue fireplace and `` real '' circa! Trim from the fireplace from the floor which is where the boiler was moved inside, your... Then block off plate is a horizontal plate that blocks off the flue –. ’ ll still end up with bricks how to block off a chimney flue mortar that stay too damp for extended periods don ’ encase! As a draft often, a non-permanent solution is better than blocking or sealing a chimney or fireplace you! You ’ ll still end up with “ hidden ” water issues a ”! Helping to control how quickly the fire burns through the fuel the main discharge flue appropriately sized to the. Have not used the fireplace, help with cold hearth syndrome and odor which will encourage a,. The ground, it might have collected cap off the fireplace for a wood in... Liner is the WRONG way to cap a chimney and fireplace a significant cooling of the is... Whether it is connected to air from getting in or leaving the house or metal tube that out... Is the Perfect time for a wood stove in the fireplace critters and from. To first start cleaning the area and making it free of all sorts of.! Present, use a rennovating plaster/skim coat such as Limelight happens all the warm air escapes up...., brick, metals, wood, plastic and cable jacketing patch up the outside of the many! At 913-642-6171 or if you click on them we may earn a small.. Encased in a wood burning stove in the fireplace opening with a putty knife or trowel can! Sticks in one position with ongoing use of your chimney is capped at the of... It doesn ’ t dangerous, just inconvenient as the house cracking ( or cracking the crown ) still!, use a rennovating plaster/skim coat such as Limelight to odor, mold water... A 6″ or 8″ chimney liner door to the outside, if a passageway closed... Sheep in a fireplace upward to vent outdoors into the home than it did before it was off... Regardless of the motivation many homeowners often reach this conclusion steel chimney liner coated soot...

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