If you are facing a chimney rebuild at your Saffron Walden home, knowing exactly what happens at each stage - and what to expect from the people doing the work - helps you ask the right questions and spot when a job is being done properly.
Call any time. Calls are answered day and night and passed straight to our roofers.
A chimney rebuild should never be specified from the ground alone. Binoculars can reveal an obvious lean or fallen pot, but the detail that matters - the condition of individual mortar joints, the state of the flaunching, whether bricks are spalling below the surface, how the lead flashings are bedded - cannot be assessed properly without getting close to the stack. That means either scaffold or, on a small number of jobs, a safe roof platform.
During an inspection, a roofer should be checking the following at minimum:
This inspection stage is what separates a proper rebuild from a rushed patch. The findings should determine exactly where the rebuild starts - there is no point taking a stack down further than necessary, but equally no point leaving a failing course in place just to save time.
Chimney work at roofline height requires scaffold. It is not optional, and any contractor suggesting the job can be done from a ladder or a cherry picker resting on a pitched roof is not working safely. Proper scaffold around a chimney stack gives a working platform at the right height, protects the roof below from falling material, and allows the work to be done at a pace that gets it right rather than fast.
For most domestic chimney rebuilds, a simple chimney scaffold - four uprights with boards at stack level - is sufficient. On some properties with restricted access or complex rooflines, additional thought goes into how the scaffold is arranged. The cost of scaffold is part of the overall rebuild cost; it is not something a responsible contractor skips to sharpen their price.
We cover Saffron Walden from our base in Haverhill, working across the area including Halstead, Clare and Newmarket. Scaffold is arranged as part of the job.
The failed section of the stack comes down course by course. This is methodical work, not demolition. Each brick is removed carefully to preserve as many as possible for reuse, and the debris is lowered rather than dropped - both to protect the roof and to avoid disturbing the lead flashings at the base of the stack.
The point at which the rebuild starts is determined by the inspection findings. Typically, a partial rebuild starts just below the first sound course - where the mortar joints are still solid and the bricks are undamaged. On a fully compromised stack, the rebuild may start at roofline level. Bricks that are spalled, cracked, or have absorbed significant moisture are not reused regardless of how they look from the outside.
As the stack comes down, the roofer should be reassessing. Sometimes the deterioration goes further than the initial inspection suggested, particularly if frost damage has been working through the interior of the brickwork without much external sign. Any change in scope at this stage should be explained to the homeowner before work continues.
Before any new brickwork goes up, the base course needs to be clean, level and sound. Any loose or crumbling mortar is raked out and the remaining original brickwork is cleaned back so the new work bonds properly.
Brick selection at this stage matters. If original bricks are being reused, they are cleaned of old mortar and checked individually for soundness. New or reclaimed bricks are chosen to match the existing stack as closely as possible in size, colour and texture. The mortar mix is agreed before the first course goes down - for older properties this usually means a lime-based mix; for post-war brickwork, a sand-and-cement mix at the right proportion. Using too-hard a mortar on older masonry is one of the more common mistakes on chimney work, and one that causes further damage over time.
The new brickwork goes up course by course, with each course checked for level and plumb before the next is laid. The mortar joints should be consistent in depth - typically 10mm for standard brickwork - and finished to match the profile of the original pointing where the old stack is retained.
Any flue liners or internal duct work that has been disturbed during the takedown is addressed at this stage. If the chimney is still in active use with a solid fuel appliance or log burner, the liner should be inspected by a HETAS-registered engineer separately - chimney rebuilding addresses the external structure, but the liner condition is a fire safety matter that sits alongside it.
The pot is seated into fresh flaunching at the top of the completed stack. The flaunching is shaped to slope outward from the pot base so that rainwater sheds away from the top of the brickwork rather than pooling in the joint. If the pot is being replaced, the new pot is selected to match the existing pots on the property where possible.
With the stack rebuilt, attention moves to the lead flashings at the base. Step flashings run up the sides of the chimney, cut into the mortar joints of the stack and dressed over the roof tiles. The back gutter runs across the back face of the chimney, and the front apron covers the downslope joint. All of these need to be secure, correctly dressed and pointed.
If the flashings are in good condition and were not disturbed during the rebuild, they can sometimes be left in place. More often, lifting the stack slightly or removing lower courses means the flashings need to be lifted and re-dressed or replaced. Code 4 lead is the standard for stepped flashings; Code 5 is used for back gutters and upstands that take more standing water.
The roof tiles immediately around the chimney are checked and any that were disturbed during the work are refixed or replaced. The roof below the chimney is inspected for any debris that came down during the takedown, and any damaged tiles are noted.
Before scaffold comes down, the completed stack should be checked for plumb one final time, the pointing inspected on all four faces, and the flaunching checked for any cracking as it begins to set. Any mortar splashes on the roof tiles or flashings below the stack are cleaned off while still workable.
Once the scaffold is struck, the area around the property is cleared. Debris from the takedown - broken bricks, old mortar, pieces of flaunching - is removed from site. The condition of the gutters directly below the chimney is worth checking at this point as well, since grit and debris from a failing stack often accumulates in the nearest gutter over time.
A good chimney rebuild leaves the stack plumb, pointed and properly capped, with flashings that are well dressed and no water entry paths left open. If you want to know what your chimney in Saffron Walden actually needs, call Haverhill Roofers for a proper inspection before anyone starts quoting for work.
Moss holds moisture against the tile surface and, in sufficient volume, can lift tile edges and block gutters. It is worth treating, but the method matters more than most people realise. Scraping or pressure washing can damage tile surfaces, particularly older or softer clay tiles. A biocide spray that kills the moss and allows it to break down naturally over several months is the safer approach for most pitched roofs.
For a pitched roof in reasonable condition, every two to three years is a practical interval. Chimneys should be looked at more frequently - or promptly after any winter with hard frosts - because freeze-thaw damage can progress quickly once it has started. An inspection does not always mean scaffold; sometimes a close look with binoculars from a safe vantage point will reveal enough to decide whether closer access is needed.
It can. High-pressure water removes the protective granule coating from mineral felt tiles, can chip arrises on clay tiles, and forces water into open joints. Lower-pressure rinsing combined with a biocide treatment is safer. On some older or fragile tile types, cleaning is not recommended at all - natural weathering is preferable to the risk of damage.
Chimney rebuild work does not usually involve opening up the roof, so it is not directly connected to loft insulation. However, if other roofing work is being done at the same time - tile repairs, ridge work or a flat roof covering - it is worth discussing whether insulation can be improved while access is in place. Combining work is almost always more cost-effective than returning for a second job.
Inside the house: damp patches near the chimney breast or on upper-floor ceilings, staining on walls, or a musty smell in the loft. Outside: slipped tiles, open ridge mortar, a chimney that looks out of line, or mortar and brick fragments appearing in the gutters below the stack. Any visible change to the roofline is worth investigating before the next wet season.
No obligation · We'll call you to arrange a free visit
Call any time. Calls are answered day and night and passed straight to our roofers.
