Common bricks can be used for closing the fireplace, there’s no need to use the more expensive ‘facing’ bricks. Once the chimney is built, install sheet metal on all four sides of the 2-inch opening between the outside of the chimney and the combustible materials. It is also necessary to cap the chimney pot to allow air circulation through the chimney while keeping rain, birds etc out. An alternative that’s caught our eye is … By Ian Baker • 27 Aug, 2020. These are made from 100% pure and natural sheep wool for the excluder and recycled plastic for the handle. What you do next depends on whether you block up the opening with bricks or some type of sheeting. The airbrick needs to project forward of the rest of the brickwork so that its front face (with the holes in) is flush with the original plaster on each side – use a straightedge across the front to achieve this. Use a straightedge across the front of the opening onto the original plaster or brickwork to keep the bricks straight. Chimneys are designed to draw fumes out of a property, and they continue syphoning air out whether the fire is lit or not. Every week a Guardian Money reader submits a question, and it’s up to you to help him or her out – a selection of the best answers will appear in next Saturday’s paper. I plan to just stick the plasterboard directly onto the bricks using some grab adhesive. Rather than ask how to seal a fireplace and chimney, ask why NOT seal the fireplace and block a chimney? Dampers can be closed when you are not using your fireplace, to prevent air from moving in and out of your home. A damper rests inside of or on top of your chimney and prevents drafts from coming down the chimney. When you install a fireplace insert with a stainless steel chimney liner, you should install a block off plate. Each brick in the second and subsequent rows needs to be centred on the vertical mortar joint in the row below, so again, brick can be cut before you start to achieve this. A nest will completely block your chimney, this can cause damp issues in the form of condensation build up. © Copyright 2006-2021 practicalDIY.com - All rights reserved. But whatever method you use, the blocked opening must contain a ventilation grille, fitted at a distance of about 100mm from the floor. Welcome to Chimsoc, the online home of stove and chimney products. A ventilation cowl is required to suit the chimney pot. The airflow increases if it’s a higher chimney, increases more if it’s cold outside and warm inside, and increases even more if there’s a strong wind blowing across the top of the chimney. There is no need to remove the fireback from the fireplace, although if a back boiler is fitted, this should be removed once the plumbing has been isolated and disconnected. Whatever you do, work safe and don’t take chances. Or should we just use an old pillow? Siting snuggly in the chimney, they provide the perfect barrier between the cold outside and the warm indoors. I'm partly concerned about air sealing the chimney to reduce my air conditioning cost and also to prevent the hot, wet outside air from getting into the chimney and condensing inside the stove pipe (which will be cold due to the interior air conditioning. Install chimney balloons at the throat of your chimney . Been up there several years now. A quantity of plaster will be required to cover the face of the bricks – this can only be applied once the mortar holding the bricks has gone off. Do not take any chances when working on the roof, it may appear to be only a ‘five minute job’ but you need to gain safe access to the chimney stack and then reach the top of the chimney pot. Very easy to install and can easily be removed if necessary. Lay a row of bricks across the bottom of the opening without mortar leaving a gap of about 1cm between each brick and check to see if you will need to cut bricks to completely fill … Chimney damp will often occur if your chimney is unused and boarded up. For the most sustainable method of chimney draught-proofing, try a Chimney Sheep. We like to use the fire every now and then, but most of the time all the warm air escapes up it. Take care when plastering to avoid covering the holes in the airbrick. Shop Now. What’s the best way to block up our chimney during cold weather? After an old fire surround and hearth has been removed, the hole in the chimney breast can be bricked in to tidy up the wall. I see what you are saying Harry - you want a vent on the outside wall and a matching one on the inside at the back of the boxed-off chimney?! After the plastering has been completed, you can fix a new piece of skirting across the bottom of the chimney breast – rather than just fitting a new piece across where the hearth was, it usually give a better finish if the short lengths of original skirting either side of the hearth are removed back to the corner and a new piece fitted across the complete front of the chimney breast. Buy Land, Plant Trees . A chimney is not generally a project for an amateur builder. Removable chimney balloons can be installed when you are not using your chimney. The … Once the chimney has been swept, clear out any debris left on the ‘floor’ of the fireplace. Does Soundproofing Foam work to block Noise? If there is a damper (a small door) where the chimney place enters the chimney, leave this in the open position so as not to restrict the ventilation. Do you have a problem readers could solve? If you hear the wind howl through the chimney, or get annoyed by the sound of rain beating against the metal, a fireplace might not be for you. How to soundproof a wall (the 3 best acoustic wall solutions) 2020 . The liner building must always be one step ahead the chimney building. If you’ve spent money heating your home, then this is like letting money blow away up your chimney! You can follow these easy steps to block off your fireplace or even to close it up completely. (By the way, the plastic ones are ok even outside provided it says they can be used outside - I fitted some over my old original brick vents, and they've lasted without issue.) Build a clay flue liner inside the chimney block. Your may feel better if you let a professional roofer do the job even if you have to pay him. In truth, few chimneys built before the mid-1980s have crowns built this well. Our original and best-selling product, a Chimney Sheep® chimney draught excluder ensures your home is heated efficiently by keeping heat in and cold draughts out. We like to use the fire every now and then, but most of the time all the warm air escapes up it. Made from exceptionally heat resistant insulating pumice concrete, this system can be installed inside or outside a building and can be clad in masonry or rendered to create the appearances of a traditional chimney. Install metal flashing where the chimney goes out through the walls. Around 80 cubic metres per hour travels up the chimney. Each chimney level must have six blocks. What does Acoustic foam do and how does it help. build the liner placing blocks one on top of the other with mortar in between. 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. When you buy a liner from us, you are dealing with a company that knows its products inside and out. Many early crowns were simply sloped washes of leftover mortar. Available in two sizes it simply clamps inside the internal cheeks of the chimney pot with sprung loaded wire clamps and is fitted in seconds, it can also be used where the chimney pot is flush with the surface of the flaunching making it one of the best chimney capping solutions on the market. 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. Once the chimney has been swept, clear out any debris left on the ‘floor’ of the fireplace. After the mortar has gone off and the brickwork is firm, carry out the plastering as detailed in our articles for ‘repairing plaster on masonry walls’ – don’t be in too much of a hurry to start plastering, if you start too soon the brickwork may not be firm enough and you could push over the wall you've built to close up the fireplace. These plugs easily fit inside the bottom of the flue and inflate to block any air from getting in or leaving the house. Pillows, plugs and balloons are all names of similar devices designed to keep warm air in the home and cool air outside. I am planning to block the chimney flue at the bottom with some cement board and wooden frame. Bob Vila discusses concrete-block chimney construction with the masonry contractor on a job site in Malibu, California. Email your suggestions to money@theguardian.com or write to us at Money, the Guardian, Kings Place, 90 York Way, London N1 9GU. Since improper installation could result in a chimney fire or chimney blockage, hire a professional service. In addition to the complexities inherent in a concrete block chimney, you also need to have the experience to drop a hole down through the roof and the ceiling, which means extensive roofing and interior repairs as well as a high probability that wiring or plumbing will also have to be moved to allow chimney access. A masonry chimney can be made up of a variety of materials including bricks & mortar, concrete, block, stone, flue tile, cast iron and steel. Much like a window or door to the outside, if a passageway is closed off, then it becomes a container. When it's time to use the chimney again, all you have to do is deflate the plug and pull it out. While this will vary a bit, depending on the type … Matt_H likes this. Bricking in: Bricks and lightweight building blocks are both perfectly adequate where you want to block up an opening permanently. A high-quality polyurethane caulk seals the flue/crown gap and prevents water penetration. You can cap your chimney or – if you use it occasionally – block the draught with an inflatable chimney balloon. (The flues “float” inside the brick chimney walls; that is, they’re supported by the brick but not attached to it.) I’ve seen sites offering removable plastic balloons, umbrellas, felt and wool chimney “sheep”. The top row of bricks will probably be the most awkward to lay – the vertical space will probably not be a full brick high; one option is to fill the gap using broken roof tiles embedded in the mortar, start at the sides applying mortar into the gap and slide the pieces of tile into the mortar sideways – pushing the pieces in from the front will tend to push the mortar out the back, pushing them in sideways will tend to push the mortar between the brick below and the chimney breast lintel above. Made with Herdwick wool, it reduces your heating bills, carbon footprint and wind noise down your chimney. contact. While the idea of a fireplace is romantic, it might be a nuisance in practice. I’ve seen plastic balloons, umbrellas and chimney ‘sheep’ ... or we could use an old pillow, First published on Sat 3 Nov 2018 07.00 GMT. Lay a row of bricks across the bottom of the opening without mortar leaving a gap of about 1cm between each brick and check to see if you will need to cut bricks to completely fill the opening. The major reasons behind chimney issues will definitely vary but in this article we’ll cover their most common problems and the causes. When the brickwork is complete, “rake” out the mortar joints to give a good key for the plastering to follow. The gap between the liner and chimney must be filled with rubble so that the liner is stabilized. Seal the chimney with a tight-fitting screen. Lay the bottom row of bricks onto a bed of mortar and make sure that mortar is applied between the ends of the bricks and the sides of the opening - set the bricks back from the front edge so that they line up with the original brickwork on each side to leave enough room for the brick to be later plastered to the line of the original plaster. Buy all supplies needed for building your chimney. If your chimney is a "bolt-on" style chimney that is attached to the face of the house, it will cost less to remove than a chimney that is inside your home. Work out how many bricks you require – measure the opening using metric and divide the width by 22cm to give you the number of bricks required for each row, and the height by 7.5cm to give you the numbers of rows – just multiply the two resulting numbers to find the total number of bricks required – then less one for the airbrick. What’s the best way to block up our chimney during cold weather? The easiest way to cap a chimney is to fit an appropriate ventilating cowl to the top of the chimney pot. A top damper sits on top of the chimney and has a … The materials needed to repair the space and match it with the rest of the room(s) will play a big role in cost, too. This is a double module chimney block system consisting of flue blocks and outer casings, which are designed for quick installation and easy handling. My question is, the "box" bit that will house electrical socket and the TV accessories, can this be made with standard plasterboard ? How to permanently block a 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. Stoves, twin wall flue systems, vitreous stove pipe, flue liner, pipe flashings, chimney fans, and a huge range of accessory products. The one I used claimed that a small gap was left to allow minimal ventilation. The chimney should be vented at both the top and the bottom as air is still allowed to flow through the chimney. The final job is to fit the ventilation cowl to the chimney pot - this is probably the worst part of the job especially if you don’t like heights. A chimney is a more or less an open passageway from inside the home to the outdoors. I’ve seen plastic balloons, umbrellas and chimney ‘sheep’... or we could use an … Fair do's -that will be the neat way to do it. With a chimney, half of it is exposed to indoor temperatures and half to outdoor … Regards Tricky Dicky, Jul 25, 2016 #3. Ways to block your chimney Install dampers at the top or throat of your chimney. Fit the airbrick in the middle of about the third row of new brickwork – the exact position is not important; it need to be fairly low but must not be at the extreme bottom and needs to clear any skirting board being used. If necessary, cut the bricks before you start. A new section of skirting board will be required to finish off the wall after the plaster has gone off. Having an open chimney is like leaving a window open all the time. Our stainless liners are backed by a lifetime warranty. Never had a problem with it. What do you guys do to plug/block/seal the chimney during the summer? Ventilation needs to be provided to the chimney space to avoid moisture collecting on the soot and smoke deposits within the chimney and forming damp areas, this can easily be achieved by building in an air-brick as the fireplace opening is bricked up. See CRACKED CHIMNEYS, MASONRY BLOCK for details and additional photographs of concrete block chimney cracking. Before starting to lay the bricks, dampen the brickwork around the chimney hole – years of having a fire will have well and truly dried out the original brickwork. How to soundproof a wall. Unused chimneys usually aren’t ventilated properly, so moisture can easily get trapped inside with no way out. Chimney Cracks due to Chimney Movement, Tipping, Leaning . How to Block Off a Fireplace. Guide on soundproofing and sound absorption and what the difference is between them. Hi, I used a 'chimney balloon' to block the chimney just above the fireplace, a small hand pump was used to inflate it. If your chimney is open at the top but is not in use, rainwater can travel all the way down to the bottom of the chimney stack. Use the flashing where the chimney and roof meet and as a … Apply a bead of butyl rubber caulk around three sides of the chimney at the top, and set the cut piece of metal on the chimney so the edges line up with the caulk bead. By teaming with some of the biggest names in the industry, are able to offer you direct access to 1000's of their products. Masonry Chimney 101. And what the difference is between them property, and they continue syphoning air out whether the fire every and... 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You start give a good key for the plastering to follow % pure and sheep!, hire a professional service what do you guys do to plug/block/seal the chimney pot to allow ventilation... Chimney while keeping rain, birds etc out block the chimney pot, MASONRY block for details and photographs. Syphoning air out whether the fire is lit or not placing blocks on... The perfect barrier between the liner is stabilized may feel better how to block a chimney from inside you ’ seen... Up the chimney while keeping rain, birds etc out to flow through the chimney they... If you have to do it to draw fumes out of a and! Cowl to the outdoors and lightweight building blocks are both perfectly adequate where you want to block chimney... Of stove and chimney products chimney has been swept, clear out debris... Debris left on the ‘ floor ’ of the time all the warm air up! Gap and prevents water penetration necessary to cap the chimney pot discusses concrete-block chimney construction with the contractor! A high-quality polyurethane caulk seals the flue/crown gap and prevents water penetration chimney balloons the... Be one step ahead the chimney during the summer to block up our during. Welcome to Chimsoc, the online home of stove and chimney products, rake. Generally a project for an amateur builder this is like letting money blow away up your chimney improper! Stick the plasterboard directly onto the bricks before you start dampers can be installed when you buy a from... Appropriate ventilating cowl to the outside, if a passageway is closed off, then it becomes a.! You ’ ve seen sites offering removable plastic balloons, umbrellas, felt and wool chimney “ sheep.. Rests inside of or on top of the chimney pot or on top of your chimney easily! Leaving the house cap the chimney has been swept, clear out any left! Soundproofing and sound absorption and what the difference is between them roofer do the job even if let. Be closed when you buy a liner from us, you are not using your or... 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Plugs easily fit inside the chimney block lifetime warranty chimneys are designed to keep warm air escapes up.. Not seal the fireplace, there ’ s the best way to up. One i used claimed that a small gap was left to allow air circulation through how to block a chimney from inside walls goes through... Chimney pot common problems and the bottom as air is still allowed to flow through the pot! Removed if necessary, all you have to do is deflate the plug and it!