If you are considering having a redundant chimney stack removed at your Sprowston home, here is exactly what the process involves from the initial inspection right through to the finished roof.
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No chimney take-down should begin without someone actually looking at the stack and the surrounding roof. This is not a job that can be properly priced or planned from the pavement. The roofer needs to get up to roof level to assess the condition of the stack itself, the state of the flashing where the stack meets the roof slope, the surrounding tiles or slates, and the timbers beneath the roof covering at the stack position.
At this stage, the key questions are: How tall is the stack above the roofline? What material is the roof covering and how closely can it be matched? Is there any sign that the stack has been leaking, and if so, how long has it been going on? Has the leak affected the roof timbers? The answers to these questions shape the scope of the job and the cost.
If there are signs of a long-running leak - staining on the rafters, softness in the sarking felt, or damp on the timbers - this needs to be addressed as part of the job, not ignored. Closing over a roof with damaged or wet timber underneath stores up a bigger problem for later.
The access method depends on the height of the property, the pitch of the roof and where the chimney is positioned. On a single-storey or low-pitch roof, a roof ladder may be sufficient for a straightforward stack. On a two-storey property with a chimney positioned away from the eaves, scaffold is the safer and more practical option.
Scaffold gives the roofer a working platform at ridge level, which is important when dismantling brickwork. Loose and heavy masonry needs to be lowered to the scaffold deck, not dropped. Dropping debris risks damaging the tiles below and is simply not how a competent job is done. If a roofer quotes for this work without mentioning access, it is a reasonable question to raise: how do they plan to get up there, and how will the rubble come down?
For most two-storey homes, expect scaffold to be part of the package. It usually takes a few hours to erect and is struck once the roof is signed off as finished.
The brickwork is dismantled from the top down. Chimney pots are removed first, along with the flaunching (the cement haunch that holds the pots in place). The bricks are then worked loose course by course. Older lime mortar joints tend to make this easier than modern cement pointing, which is sometimes harder than the bricks themselves.
The stack is taken down to a point below the roofline. In practice, this usually means working down to just beneath the roof surface - enough that the finished roof covering sits flat and continuous with nothing protruding. The exact stopping point depends on the roof geometry and whether there is a ridge tile, hip or valley nearby that affects how the patch is detailed.
As the work progresses, all masonry is stacked on the scaffold deck and then hand-balled or lowered to ground level. It should not be thrown. The chimney pots themselves are often salvageable and can be offered to the homeowner if wanted, or taken away if not.
Once the stack is down and the roof structure at that point is exposed, the roofer can inspect the timbers properly. If the stack was leaking, this is where the evidence will be. Staining, softness or rot in the rafters or purlins around the former stack position needs to be dealt with before the roof is closed over.
Minor dampness in otherwise sound timber is generally not a structural issue - timber that dries out after the source of water is removed will stabilise. But timber that has gone soft, shows active rot or is structurally compromised needs cutting out and splicing or replacing. This is less common than people fear, but it does happen on stacks that have been leaking for several years unnoticed.
The sarking felt - the underlay beneath the tiles - is also checked at this stage. If it has been pooling water, it may have split or degraded around the stack opening. A good roofer will lap new underlay across the opening before boarding and tiling over it.
With the masonry gone and the structure sound, the opening needs to be closed. Light timber noggins or a simple frame are fitted across the gap between the rafters to provide a base for the new roof covering. This framework needs to be level and solid - it is the foundation for everything above it.
A layer of breathable roofing underlay is then lapped across the frame and tucked under the existing underlay where possible. This keeps the detail weathertight even before the tiles go on. Any upstands or soakers needed to manage water running off the adjacent roof slopes are fitted at this stage.
This is the most visible part of the job and the stage where tile or slate matching matters most. The roofer cuts tiles or slates to fit the patch area and beds or fixes them to match the gauge (the spacing) of the surrounding courses. The ridge tiles at the former stack position are cut and rebedded as needed.
On a concrete interlocking tile roof, matching is generally straightforward. On an older clay tile or slate roof, it takes more care. The pitch, the gauge and the overlap all need to be replicated precisely to keep the roof weathertight. A patch that is slightly out of gauge will not drain properly.
Lead or appropriate flashing is dressed around any remaining upstands and at the junction with the ridge if needed. The finished area should be weathertight and as tidy as the tile or slate matching allows.
All debris - broken mortar, old bricks, flaunching and any waste materials - is cleared from the scaffold deck and from around the property. Gutters should be checked and cleared of any grit or dust that has found its way in during the work. A final visual check of the finished patch, the surrounding tiles and any lead work confirms the job is done.
Before the scaffold comes down, it is worth taking the time to look at the finished patch from the scaffold level and from the ground. Any tile that looks out of line, any flashing that looks loose, and any ridge tile that is not sitting flush should be addressed while access is still in place. Once the scaffold is struck, getting back up there is another job.
When the job is complete, the roof over the former stack position should be continuous and weathertight. There should be no open joints, no loose tiles and no exposed timber. The chimney breast inside the property remains in place and structurally unchanged. The flue void is sealed at roof level.
If you are in Sprowston and your chimney stack is redundant, call Poringland Roofers to arrange an inspection. We will tell you clearly what the job involves on your specific property before any work begins.
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Call any time. Calls are answered day and night and passed straight to our roofers.
