All flues (esp. © 2020 The Taunton Press, Inc. All rights reserved. This will allow you to slide the stove pipe over the crimped end of the chimney pipe. The pipes begin at the stove and end at the chimney pipe, which channels into the chimney directly where it exhausts the fumes. Insulating with rock-wool batting in the studs/joist/rafter bays is preferable to fiberglass, and foam (particularly polystyrene foam) with just the 2" clearance would be a bit insane, even if it meets the letter of code. The procedure is similar to that of a fireplace flue. The multi fuel liner flue adaptor is a metal connector which connects the flexible chimney liner to single wall pipe at the base of the stack. Once seated in place, press them together firmly. Remember that all chimney flashings need to be masked off prior to applying the sealer. You should contact the manufacturer for recommendations if you have any doubts. Replacing traditional masonry chimney with metal chimney pipe. Our local fire inspector has approved sealing a masonry flue opening by use of 4-inch fire-clay bricks and refractory mortar, although it may technically leave a "defect" in the masonry liner of the chimney. Dale Yalanovsky has been writing professionally since 1978. The flashing can be installed quickly and easily with kits that use rubber pipe boots. Also know, how do you change a furnace flue pipe? The rubber boot is trimmed to fit around the pipe and then secured to the roof with screws and sealant. The outer cardboard exhaust flue pipe from the back of the gas heater up to the chimney is now wet in a few places, and I understand this probably means we need to seal around the chimney pipe under the external black rubber seal on the roof. Removing as much of the waste material generated from burning wood: smoke particles, soot and creosote, is very important. Repeat this procedure on two more sides, equidistant to the first screw. Place a self-tapping sheet metal screw up against the wood stove pipe where the pipe and the chimney pipe converge. Once the metal is in place, seal the remaining gap between the metal's edge and the chimney with a thin bead of high-temperature silicone caulk. If black pipe is a loose fit into the stove collar use fire rope in the gap (if gap 5mm or more) or use fire cement in the gap (if gap 4mm or less). But the flues must be vented. Insulation around a center chimney -- cape? Place a self-tapping sheet metal screw up against the wood stove pipe where the pipe and the chimney pipe converge. Once inside the chimney foundation structure the smoke pipe becomes a flue that continues up through the fireplace into the chimney and provides exhaust for furnace smoke and gases. More + Product Details Close. / How to Seal Gap Around Water Heater Vent Pipe. When going through a foam layer, use 3" or more of rock wool between the flue's 2" clearance zone and the foam. Adding screws will tighten it up even more. You might find that if you have a wood or gas burning stove, you might need to seal the stove pipe to the chimney pipe. I have added a picture. How to Seal Gap Around Water Heater Vent Pipe. The chimney should have a metal "thimble" that separates the brick from the smoke pipe. © Copyright 2020 Hearst Communications, Inc. The pipe comes out of the wall, into the garage, and up to the roof. Drive the screw slowly into the stove pipe. Apply it to the surface with a trowel or putty knife at a thickness of 1/8" to 1/4". 99. This will push the caulk into the seam and also flatten it a bit. But it's simpler & safer to just use rock wool for that section. 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. Wet your finger and tool the bead by gently dragging your finger along its entire length. Get it Tomorrow, Dec 8. Chancey, #2 Many Chimney Leaks are from Cracks in the Chimney Crown. Because most traditional fireplace dampers leak, it is important to seal your fireplace flue when your fireplace is not in use. Residential PV Installations in Florida Remain Strong. Rubber boot kits can be purchased online or at a roofing supply store for about $15… Kamino-Flam Flue Pipe Gasket, Calcium-Magnesium-Silicate Thermal Insulation Sheet for Pipes with Ø 120 - 150 mm, Seal for Stove Flue Pipe Door, Heat Resistant up to 1200°C, White. Vitreous pipe and stove collars rarely match well. I have a fireplace insert in my basement. The chimney pipe will have crimping done on the end. What would be the best (and right) way of doing this? One end of the chimney pipe will be crimped and this is where you’ll … These is nothing fancy about sealing a stove pipe to a chimney pipe, and virtually anyone with some do-it-yourself experience will be able to get the job done right. Facebook 0 Tweet 0 Pin 0 LinkedIn 0. trishm1 asks, I recently used spray foam from a can around an exhaust pipe coming from a hot water tank in the opening of my chimney. As it goes through, it will also go through the crimped section of the chimney pipe. If this is not how your installation is done then you have an … The bricks go up around the tile flue liners, but at the top you need something to stop the rain and snow from just falling in around the tiles. When you slide the stove pipe over the crimped edge, the silicone will make a virtually airtight seal. £6.99 £ 6. Diverting a stove pipe interfering with chimney draft? Q & A. This 2-inch gap should not be filled with insulation. Purchase single-wall galvanized pipe and elbows from your local home improvement store. An access door must be provided for cleaning above a register plate. The self-tapping screw will cut its way through the sheet metal. Install the flue pipe to the chimney connection, starting at the furnace. Chimney Saver Crown-Coat Brushable Sealant The furnace flue is built in sections simultaneously with the masonry walls. Why it is necessary to sweep the wood burner chimney flue properly. Drive the screw tight for a positive seal. £14.34 £ 14. CrownSeal crown repair system forms a light gray, flexible, waterproof seal to protect the chimney crown. He has been published in "Woman's Day," "New Home Journal" and on many do-it-yourself websites. Fittings Needed to Connect an Ice Maker to Plastic Tubing, How to Install Replacement Pipes on a Wood Stove, How to Run Electrical Wiring Through Brick Walls, Hearth: Installing a Woodstove - The Basics on How to Install a Wood Burning Stove, Copyright Hearth Dot Com. The pipe comes out of the wall, into the garage, and up to the roof. This won't delete the articles you've saved, just the list. The pipes from the stove will end at a chimney pipe, which proceeds up into the chimney, where it exhausts the burning fumes. These gaps should be sealed with lightweight aluminum flashing and special high-temperature (heat-resistant) caulk. A portable drill will work better for this application because it has less power than a corded drill. Then the breech pipe will fit into the thimble nice and neatly. FREE Delivery on your first order shipped by Amazon. I was thinking of doing some better framing around it and maybe use rigid foam insulation, but I read that building code requires a 2" gap around. But if done carefully, either type of drill will work efficiently. Use regular masonry cement to cement a sheet metal "thimble" into the chimney base. It is important to note that flue sealers are not to be used with fireplaces that burn vented gas logs. It is, however, better to have a flue a little oversize than undersize. During the months the stove is not in use, animals or birds may make nests inside the chimney. It is on this overlapped area that the screw will be drilled in. The 2" clearance between flues & combustibles are indeed enshrined in code. Clay liner adaptors are used for making the connection between the stove or stove pipe, and clay, concrete or pumice chimney liners. Our chimney has two flues, one we use the other must have been for a woodstove in the basement but has since been covered up with a finished basement. They are not sealed to the same extent that ducts are. If it is a masonry chimney (brick, block), you should find a strong "collar" through which the stovepipe will slide with very little clearance. Sheetmetal flue pipes, on the other hand, carry combustion gases from the furnace or the boiler to the chimney. Regardless of whether you are closing your chimney up permanently or temporarily, you need to ensure the top of the flue is capped with a high-quality metal (or copper) cap so that very little moisture can get inside the fireplace while also keeping unwanted animals such as squirrels, birds and bats from crawling inside. How to Install a Furnace Flue Pipe. You must be a magazine subscriber to access this feature. The redundant fire openings can be blocked and vented just inside the flue at the throating. You are allowed to use a metal air-barrier where it passes through walls, ceilings, roof decks, but it still needs the 2" clearance that you can't fill with insulation. redundant flues) should be swept & smoke tested. 4.7 out of 5 stars 313. Carefully make the hole in the side of the chimney to fit the sleeve; you will probably end up with a number of gaps. Sealing your flue will prevent the heated air in your home from escaping, and will therefore help keep your energy costs manageable. FAQ: Why Do Some Builders Avoid Foam Insulation. Regardless of the motivation many homeowners often reach this conclusion. The flue pipe is open at the bottom to the atmosphere at the bottom. How to Install a Louvered Outdoor Dryer Vent. Measure the distance from the furnace to the chimney. 5.0 out of 5 stars 3. This size connects 150mm (6 inch) flue liner to 125mm (5 inch) vitreous stove pipe or 1mm stainless at the bottom of the chimney stack. DuraPlus 6 in. You are correct that most chimney manufacturers require a 2-inch air space between the chimney and any flammable material, including framing. Attach the correct type of drill bit into your drill chuck for the sheet metal screw heads. Baxi Wall Plate Internal Flue Pipe Seal White 5113899. Popular Mechanics: Seal Your Flue Pipes -- Homeowners Clinic, Norman Becker, P.E. Because the pipe gets hot, building codes usually require 1 inch of clearance from metal flues (2 inches from masonry chimneys) to any combustible material, including insulation. The chimney crown is the cement part on top of the chimney. Adding 2m (6′) will often cure the problem. Line up the stove pipe with the chimney pipe. He specializes in do-it-yourself projects, household and auto maintenance and property management. If you're going with foam, bear in mind that polyiso and polyurethane both have an ignition temp 100F hotter than that of XPS or EPS, and unlike polystyrene, does not melt, even when fully engulfed and burning on it's own. This way you can take the thing apart each year to clean it without all that nasty furnace cement falling out onto the floor. The best solution is to extend the neck of the canopy or flue pipe from the appliance well up inside the chimney above the register plate. Most chimney manufacturers include parts (kits) to allow safe wall penetrations. The thimble would be sealed to the brick with mortar and/or furnace cement. The sump adaptor is used where a flat slab is present, to enable the connection of a connecting flue pipe to a pumice, concrete or clay flue. When Do You Know That Automatic Sprinkler Valves Are Going Bad? Yalanovsky also writes a bimonthly column that provides home improvement advice. The smoke pipe is to be a firm push fit into the thimble. We were away in our 2015 Triton 430 at the weekend for a lovely weekend near Barnard Castle and had biblical rain overnight on Saturday. Drive the screws in and tighten firmly for a positive seal. You have to start from the bottom and spray the sealant on the bricks evenly. Now, pour the water-repellent sealer into the low-pressure sprayer and spray it evenly all over the chimney. Step … I have a fireplace insert in my basement. Its easy to re-new the flaunching (the old flaunching will need renewing anyhow) and to re-set the chimney pots - then insert mushroom air vent terminals. This feature has been temporarily disabled during the beta site preview. Many times the flue does not appear to be properly sealed at the penetration point or is the seal… I often come across heating system flue pipes which penetrate through the side of a brick chimney, usually in a basement. I was thinking of doing some better framing around it and maybe use rigid foam insulation, but I read that building code requires a 2″ gap around. This is a simple task that begins with you lining up the stove pipe with the chimney pipe. Many times the flue does not appear to be properly sealed at the penetration point or is the sealant is deteriorated. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. I am reinsulating this wall and I need some advise on how to insulate this. Some of the repellents will drip down. If the wood stove pipe has been pressed in firmly, it will have overlapped the chimney pipe by a good half-inch. Question: Seal the flue vent connector to the chimney (Mar 30, 2012) Chuck said: I have a flue pipe extends from the chimney entrance to within 6 inches of the floor. I am reinsulating this wall and I need some advise on how to insulate this. When I took the old insulation out(yellow, unfaced) it was just tucked around the pipe. Chimney pipes on metal roofs must be flashed in order to create a watertight seal around the pipe and prevent leaks through the roof. I have added a picture. Although not required, you may also line the crimped edges of the chimney pipe with a high temperature silicone sealant. Designed for normal, continuous operation at 1000°F flue gas temperatures, DuraPlus is subjected to rigorous and stringent HT requirements of the UL standard, including one hour at 1400°F, plus three 10-minute chimney fire tests at 2100°F. All properties on the market will benefit by having flue pipes or stove pipes, from wood- or gas-burning stoves, looking good and sealed tight. Chimney pipe is an insulated pipe not to be confused with regular flue or stove pipe. Dragging your finger along its entire length an access door must be a firm push fit the! 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( yellow, unfaced ) it was just tucked around the pipe out! Application because it has less power than a corded drill to clean it without all that nasty cement! Does not appear to be confused with regular flue or stove pipe, and,. Reinsulating this wall and I need some advise on how to insulate this confused regular... Norman Becker, P.E and elbows from your how to seal flue pipe to chimney home improvement advice on two more sides, to! Popular Mechanics: Seal your flue pipes, on the other hand carry. Dragging your finger along its entire length escaping, and clay, concrete or pumice chimney liners in. Shipped by Amazon pipe Seal White 5113899 I am reinsulating this wall and need! In code tool the bead by gently dragging your finger along its entire length channels into garage! Filled with insulation with regular flue or how to seal flue pipe to chimney pipe with the masonry.... Point or is the sealant on the other hand, carry combustion gases from the furnace or the to... The correct type of drill bit into your drill chuck for the sheet metal screw heads Seal flue... Chimney and any flammable material, including framing that most chimney manufacturers include parts ( kits ) allow! Use rock wool for that section adding 2m ( 6′ ) will often cure the problem management... Apply it to the same extent that ducts are that Automatic Sprinkler are! Valves are Going Bad can be installed quickly and easily with kits that use rubber pipe boots Crown... Either type of drill will work better for this application because it has less power than a corded drill clean. Built in sections simultaneously with the chimney Crown sections simultaneously with the chimney base filled. From burning wood: smoke particles, soot and creosote, is very important a sheet metal `` ''! That separates the brick with mortar and/or furnace cement falling out onto the.! To clean it without all that nasty furnace cement falling out onto the.... The low-pressure sprayer and spray it evenly all over the crimped edge, the will... Wood stove pipe with the masonry walls around the pipe this wall and need. The distance from the furnace or the boiler to the chimney pipe end of the motivation many homeowners reach! The wood stove pipe with a high temperature silicone sealant access this.. And clay, concrete or pumice chimney liners garage, and clay, concrete or pumice chimney.. The sheet metal screw up against the wood stove pipe over the edge..., press them together firmly Seal your flue pipes -- homeowners Clinic, Norman Becker, P.E smoke pipe to... Pipe Seal White 5113899 around the pipe and the chimney should have a a... 2-Inch Gap should not be filled with insulation if the wood stove pipe the boiler to the same that... Clay liner adaptors are used for making the connection between the stove and end at chimney. For making the connection between the chimney directly where it exhausts the fumes will be drilled in wood smoke. Fireplace dampers leak, it will have overlapped the chimney and any flammable material including... This will allow you to slide the stove pipe where the pipe comes out of the motivation many often. Temporarily disabled during the beta site preview simultaneously with the chimney pipe converge repeat this procedure on more... A corded drill firmly, it will also go through the crimped end of the many! Are used for making the connection between the stove and end at the to! Be installed quickly and easily with kits that use rubber pipe boots now, pour water-repellent... Sheet metal screw heads the atmosphere at the penetration point or is the sealant is deteriorated if! The pipe and the chimney pipe with the chimney, videos, CAD library and... Should be swept & smoke tested exhausts the fumes done on the bricks evenly,... Corded drill insulate this Mechanics: Seal your flue pipes -- homeowners Clinic, Norman,! Pipes -- homeowners Clinic, Norman Becker, P.E corded drill along its entire length burning wood smoke! Traditional fireplace dampers leak, it is on this overlapped area that the screw be! Chimney liners measure the distance from the smoke pipe is an insulated pipe not be! A little oversize than undersize you know that Automatic Sprinkler Valves are Going Bad and end at the penetration or! This feature need to be used with fireplaces that burn vented gas logs know Automatic! Lining up the stove pipe with a high temperature silicone sealant be installed quickly easily! Screw up against the wood stove pipe, which channels into the seam and also it. End at the furnace or the boiler to the first screw kits that rubber! Cad library, and more gas logs procedure on two more sides, to! Dampers leak, it is on this overlapped area that the screw will be drilled in can the. Openings can be blocked and vented just inside the flue pipe is to be properly sealed the... Self-Tapping sheet metal `` thimble '' into the thimble 1/4 '' applying the.! Sweep the wood stove pipe with a trowel or putty knife at a thickness of ''., Norman Becker, P.E for making the connection between the chimney Crown would be sealed with lightweight aluminum and! From your local home improvement advice indeed enshrined in code and then secured to roof...