Here is exactly what happens when Haverhill Roofers take down a redundant chimney stack on a Saffron Walden home, from the first look at the roof to clearing the last piece of rubble.
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A chimney take-down is not a complicated job in the hands of an experienced roofer, but it involves several distinct stages and more than one trade skill. Understanding what happens at each step makes it easier to check that the work has been done properly, to know what questions to ask beforehand, and to avoid the shortcuts that lead to problems further down the line.
The process below describes a full take-down - removing a redundant stack entirely to below the roofline and tiling or slating over the gap so the roof is weatherproof and maintenance-free.
Before any work is quoted or planned, the stack needs to be assessed properly. A visual inspection from the ground using binoculars will reveal obvious problems such as a leaning stack, missing mortar, cracked pots or lifted flashing, but it does not tell the whole story. A closer look from scaffold or a tower will show the true condition of the pointing, the state of the lead flashing, whether the brickwork has any structural movement, and how the stack meets the roof covering at its base.
At this stage, note the roof covering material - concrete tile, clay tile, slate or otherwise. This determines which materials need to be sourced for the patch-in. If the existing tiles or slates are old, a sample should be taken or photographed clearly so a match can be sought before work begins. Getting this wrong means a visibly mismatched patch, which is difficult and expensive to put right.
The survey should also establish whether the chimney breast is still structurally attached to the house internally. In most cases it is - but if any previous owner has partially removed the breast inside the house, the stack above may have been left without proper support, which changes the method of take-down needed.
Chimney work cannot be done safely from a ladder alone. A properly erected scaffold tower or a section of tube-and-fitting scaffold is required to allow the roofer to work safely at height and to lower heavy materials to the ground in a controlled way. The type of access used depends on the height of the stack, the pitch of the roof and the layout of the property.
On a terraced or semi-detached property, access to the rear may require a longer scaffold setup than the front. This should be agreed and costed before work starts, not treated as an add-on on the day. Scaffold hire and erection is a genuine cost in the total price, and any quote that does not include it should be queried directly.
Roof ladders or crawl boards are also used to distribute the roofer's weight across the tiles when working on the slope, preventing tile breakage and protecting the existing roof covering during the job.
Before bricks start coming down, the tiles or slates immediately surrounding the base of the stack are carefully lifted and stacked to one side. This exposes the old lead flashing and the underlay beneath. These tiles need to come off without damage because they will be relaid as part of the finished job.
A dust sheet or boards are placed on the scaffold platform and on the ground below to catch falling debris safely. Chimneys on two-storey houses can have a considerable weight of brickwork above the roofline - on a standard stack this might be 800 to 1,200 kilograms of brick and mortar - and this material needs to be broken down, bagged and removed progressively.
Bricks are removed one course at a time, starting from the chimney pot and working down. Each brick is loosened and passed or lowered, not dropped. Dropping bricks risks damaging tiles below, injuring anyone at ground level and creating uncontrolled movement in the stack itself. This is one of the steps where the difference between careful work and rushed work is most visible - a roofer taking shortcuts will often try to push whole sections over at once, which is both dangerous and damaging.
The brickwork is removed down to a level approximately 150mm below the roof covering. This means the finished job has no masonry projecting above the tiles or slates, which would create a ledge where water can pool and freeze.
Old lead flashing is stripped from the brickwork chase as the lower courses are removed. This lead is set aside - it has scrap value and any reputable roofer should account for it transparently.
Once the brickwork is down to below roofline, the remaining brickwork at ceiling level inside the roof void is checked and, if necessary, a proprietary vent or cap is fitted at that point to seal the flue internally. The internal cap is an important detail - leaving the flue void completely sealed with no ventilation encourages moisture buildup in the chimney breast below.
The opening in the roof structure - the gap left where the stack passed through - is then prepared. Any damaged or rotten timbers in the surrounding rafters are inspected at this stage. If rafters were cut to accommodate the original stack, they may need a trimmer or nogging fitted to give a sound fixing for the new battens.
Fresh breathable roofing membrane is laid over the opening and tucked or lapped under the surrounding existing underlay on all sides to form a continuous waterproof layer. This is then battened out to match the gauge of the surrounding tiles or slates. Getting the gauge right is not optional - if the batten spacing is even a few millimetres out of step with the adjacent courses, the tiles will not align and the joint between old and new will be visible from the ground.
Battens are fixed through into the rafters, not just into the existing underlay or sarking board. This gives a solid fixing that will not shift over time.
New tiles or slates are laid into the patch, working from the bottom course upward and interlocking with the existing surrounding courses on each side and at the top. At the ridge, the new course meets the existing ridge tiles, which are usually pointed in with fresh mortar at the junction.
The tiles used should be as close a match as possible to the surrounding roof covering. On older roofs this may mean sourcing reclaimed tiles from a salvage supplier. On newer concrete tile roofs, matching the profile is usually straightforward but a colour check against the weathered tiles should be done before ordering. A small visual difference between new and weathered tiles is normal and will reduce over one to two seasons as the new tiles weather in.
Lead soakers or a lead valley piece are not required for a straight patch-in on a plain slope, but if the stack was located near a hip or valley, the junction may need a short lead detail to ensure the new work is fully watertight.
Any mortar that has been disturbed on the surrounding chimney areas - for example if there is a second stack nearby - is repointed with a matching mortar mix. Ridge tile bedding at the junction of the new and old roof is checked and re-bedded where necessary.
A final visual check from scaffold level confirms that all tiles are properly seated, no gaps exist at junctions, and the line of the courses is straight. Water should be able to drain freely across the new section without any lips or channels that might direct it under the tiles.
All broken brick, mortar and old felt is bagged and removed from site. The old lead flashing is accounted for. The scaffold or tower is struck and removed. The area around the house base is swept down.
A chimney take-down of this type on a standard two-storey house typically takes one to two days for the removal and patching work, plus the time for scaffold erection and striking if a full tube-and-fitting scaffold is needed.
A full chimney take-down in the UK - one stack, with scaffold, disposal and a tiled or slated roof patch - typically costs in the region of £1,000-£2,500. Larger stacks, difficult access, natural slate roofs and the need for reclaimed materials will push the figure toward the upper end. A simple job with good access and a concrete tile roof that is easy to match will sit toward the lower end.
What causes chimney leaks? Most chimney leaks come from failed lead flashing at the base of the stack, open mortar joints in the brickwork, or cracked and broken chimney pots. On a redundant chimney without any heat from below, brickwork stays wet for longer, which accelerates all of these.
Can you remove a chimney completely? The external stack can be taken down to below roofline and the roof made good, yes. Removing the chimney breast inside the house is a separate, more involved job that needs Building Regulations approval. Most homeowners in Saffron Walden asking about take-downs want the external stack removed and are not asking about internal work.
Do you repair lead flashing on chimneys you are keeping? Yes. Where a stack is being retained, new lead flashing cut to code and dressed properly into the brickwork chase is the standard repair. Typical cost is £300-£600 depending on access and the extent of the work.
If you want to see the current condition of your chimney before deciding what to do, call Haverhill Roofers to arrange a survey. We cover Saffron Walden and the surrounding area and will tell you plainly what the stack needs.
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