If you are wondering exactly what happens when a chimney stack is taken down in Haverhill, this page walks through every stage of the work so you know what to expect before anyone sets foot on your roof.
The job starts on the ground. Before scaffold is booked or any work is priced, the stack needs to be looked at properly - both from the ground using binoculars and, where access allows, from an adjacent roof slope or loft hatch. The aim is to understand what is actually there: how far up the stack rises above the ridge, what the brickwork condition is, how the flashing was installed, what the roof covering is made of, and whether there is any sign of structural movement in the stack itself.
A tilted or cracked stack changes how the take-down is approached. If there is any doubt about stability, the scaffold design may need to incorporate additional ties or protection below the working area. A stable but badly spalled stack is a different situation - slower to take apart but less of an immediate risk.
At this stage, the homeowner should also clarify what they want to happen inside the house. Is there a fireplace opening that needs sealing? Is the chimney breast being kept or removed as part of wider works? The roofer's scope ends at the ceiling, but understanding what is below helps with sealing the flue correctly.
Chimney take-down work cannot be done safely from a ladder. The brickwork is demolished from the top down, which means the working platform needs to be at or near ridge height, and it needs to be stable enough to handle the physical effort of breaking and lowering brickwork without movement. A properly designed scaffold for this work typically includes a working platform at or just below the ridge, a toe board to prevent debris falling onto the tiles below, and a debris chute or bag system for lowering broken material to ground level.
Scaffold erection usually takes half a day for a standard two-storey house. It is not worth rushing this stage. A poorly erected scaffold is a hazard, and the roofer working on top of it will not be able to do good work if the platform is moving.
The scaffold may also include protective sheeting over the lower roof sections if the property is particularly tight or if there are conservatories, outbuildings or parked vehicles directly below the working area.
The first items to come off are the chimney pot and any capping or cowl fitted to it. These are usually bedded in mortar and need to be broken free carefully rather than levered, to avoid disturbing the top courses of brickwork before you are ready to dismantle them. Old pots can be heavy - a standard terracotta pot might weigh fifteen to twenty kilograms - and are lowered by hand or in a bag, not dropped.
If the pot is intact and a reasonable size, some homeowners want to keep it for the garden. That is worth mentioning before work starts, as it changes how the removal is handled.
The brickwork is taken down one course at a time from the top. Each brick is either knocked free with a bolster and lump hammer or, where the mortar has failed, may come away with relatively little effort. The key discipline here is controlled lowering of every piece of material. Bricks dropped from ridge height onto a tiled roof cause serious damage - cracked tiles, broken battens and, in the worst case, tiles displaced enough to let water in.
All broken brickwork, old mortar, lead and debris goes into rubble bags or down a chute to a skip or bulk bag at ground level. A standard chimney stack on a two-storey house typically produces between half a tonne and a full tonne of rubble by the time it is down to roof level.
The stack is taken down to just below the level where it passed through the roof - that is, to below the roof deck and any underfelt. This leaves a small stub of flue structure inside the roof void, which is used as the base for the sealing and weatherproofing work that follows.
With the stack down, the flue is open from above. The first job is to cap it at the top of the remaining stub, using a concrete or mortar mix that forms a solid, weather-tight seal. This cap sits below roof level and will be covered by the reinstated roof covering.
Inside the house, the flue is also sealed at ceiling level. This is important for two reasons. First, an open flue at ceiling level allows cold air to move freely through the void, which affects both draught and heat loss in the room below. Second, a fully sealed flue with no ventilation at the bottom can accumulate moisture internally, which leads to damp patches on the chimney breast. A small ventilation grille or air brick at the bottom of the sealed void prevents this.
If there is a fireplace opening in the room, this is usually closed off with a board and a small ventilation slot left in it. The aesthetics of this - whether the hearth is left or removed - are for the homeowner to decide and are generally not part of the roofer's scope.
This is the stage that most homeowners are most concerned about, and rightly so. The roof covering has a hole in it where the stack passed through, and the surrounding tiles or slates will have been cut or shaped to fit around it. Simply patching over the hole is not good enough - the underlay, battens and tile courses all need to be correctly reinstated.
New battens are fixed across the opening where needed. New underlay (breathable membrane or traditional felt depending on what is already there) is lapped and dressed into the surrounding underlay. Tiles or slates are then laid in proper courses, with each one correctly nailed and bedded. The aim is a continuous, unbroken roof covering with no gaps, lifted edges or bridged joints.
Matching the existing tiles or slates takes care. On a roof with reclaimed clay plain tiles, the right material is often sourced from a reclamation yard. On a concrete tile roof, the correct profile is usually available new. On a natural slate roof, Spanish or Welsh slate is used to match the existing stock as closely as possible in thickness and colour.
Where the stack met the roof, there was a lead flashing arrangement - typically step flashings up the sides, a back gutter behind the stack, and soakers worked into the tile courses. All of this is now redundant and is removed. In its place, the junction between the reinstated roof covering and the remaining structure (or, where the stack is taken right down to below the deck, between the new tiles and the surrounding tile field) is finished with new lead dressed and clipped to seal any remaining upstand or edge.
The quality of this lead work determines whether the repair stays weather-tight for years or starts letting water in within twelve months. Lead needs to be properly dressed to the tile or slate surface, not just laid flat. Clip fixings prevent the lead from lifting in wind. Overlaps at joints need to be correct and sealed.
Before the scaffold comes down, the finished area is checked from the working platform. Every tile course is inspected for lifted edges or cracked tiles disturbed during the work. The lead flashings are checked for gaps and the cap on the flue stub is confirmed solid. Any mortar used during the job is cleaned off surrounding tiles before it sets hard.
At ground level, all rubble, bags and debris are loaded and removed. The skip or bulk bag is collected. The scaffold is struck and taken away. The finished job should leave no trace on the ground beyond the repaired roofline visible from the street.
If you have a chimney in Haverhill that needs taking down, call us to arrange a survey. We will walk through each of these stages with you and give you a clear, itemised price before any work starts.
No obligation · We usually respond within 2 hours
Storm damage, active leak, damaged ridge - we aim to be on-site within 24 hours.
