Chimney Repointing Swindon

When Does a Swindon Chimney Need Repointing?

Chimney stacks are the most exposed part of any building — fully exposed to wind, rain, frost and thermal cycling from all four sides. The mortar joints between the bricks deteriorate faster than on sheltered walls. In Swindon, the plateau exposure at 120m accelerates this — chimney pointing on west-facing stacks lasts approximately 20% less time than on sheltered properties in nearby valley towns.

Lime Mortar vs Cement — Which for Your Chimney?

Pre-1920 chimneys — Old Town, Railway Village, Rodbourne, Moredon: NHL 3.5 hydraulic lime mortar. This is not optional — cement mortar on period brickwork causes serious damage. The softer historic bricks need mortar that flexes with thermal movement. Cement is rigid, cracks, and traps moisture inside the brickwork where it freezes, spalls the brick face, and accelerates deterioration. Post-war chimneys — all estates from 1950s onward: cement mortar is appropriate for the harder engineering bricks used in modern construction.

Flaunching, Cowls and Capping

Flaunching is the cement or mortar bed that holds the chimney pot in place. It cracks and fails over time, allowing rain directly into the flue. We re-flaunch using flexible mortar that resists thermal cracking. Chimney cowls prevent rain entering disused flues while maintaining ventilation — essential to prevent condensation in sealed flues. Chimney caps seal the stack entirely for permanently disused flues, but only after confirming no active flue requires ventilation.

Swindon Chimney Exposure Patterns

West-facing and south-west-facing chimney faces receive the most wind-driven rain in Swindon and deteriorate fastest. On hilltop locations — Highworth, Faringdon, the western edge of Shaw — all four faces are equally exposed. In the sheltered valley locations — Chiseldon, Cricklade, Lechlade — chimney pointing lasts significantly longer due to reduced wind loading and thermal cycling.

Chimney Repointing Prices

The Swindon Chimney Exposure Map

We have worked on chimneys across Swindon for 20 years and the exposure pattern is clear. West-facing and south-west-facing chimney faces deteriorate fastest because they bear the brunt of Atlantic weather systems. On the exposed western estates at Shaw and Toothill, chimney pointing lasts approximately 20 years before requiring attention. On sheltered eastern estates at Covingham and Eldene, the same mortar specification lasts 25–30 years. Period chimneys in Old Town and the Railway Village with lime mortar pointing have a longer cycle — 30–50 years between repoints — but the lime mortar must be correctly specified to achieve this. Cement mortar incorrectly applied to period chimneys fails within 10–15 years AND damages the underlying brickwork. We have repaired many chimneys in Swindon where previous cement repointing has caused spalling, frost damage and accelerated deterioration that would not have occurred with the correct lime specification.

Repointing Method — Why Hand Raking Only

We rake out old mortar to a minimum depth of 15–20mm using hand tools only. We never use angle grinders on chimney repointing. Angle grinders cut faster but they also cut into the brick edges, creating wide, feathered joints that hold less mortar, retain more water, and fail faster than properly raked joints. On period brickwork — which includes all of Old Town, the Railway Village, Rodbourne and Moredon — angle grinder damage to soft historic bricks is irreversible and significantly devalues the masonry. Hand raking takes longer but preserves the brick arrises, creates a clean joint of consistent depth, and allows the new mortar to bond properly to sound masonry rather than damaged surfaces.

Chimney Damp — Multiple Causes, One Diagnostic Process

Damp on a chimney breast is not always caused by failed external pointing. Three other causes produce identical symptoms. A cracked flue liner allows condensation from the flue to penetrate the chimney from inside. A failed lead flashing allows rain entry at the roof-to-chimney junction. Condensation in a sealed unused flue creates moisture with no external source. We diagnose the actual cause before recommending work. Repointing a chimney that has a cracked flue liner will not solve the damp regardless of how good the pointing is. Our chimney inspection checks all four potential causes and recommends the correct fix for the specific problem found.

Our Commitment to Swindon Homeowners

Twenty years of continuous service to Swindon homeowners means we have fixed roofs on every type of property in every neighbourhood. We have seen every roofing problem this town produces — from the nail sickness crisis on the post-war estates to the listed building conservation work in Old Town and the Railway Village. We know which materials last in Swindon's exposed conditions and which fail prematurely. We have a reputation built entirely on doing good work at fair prices — no advertising, no cold calling, just honest workmanship that speaks for itself. We are NFRC registered, carry five million pounds of public liability insurance, and provide a written 10-year workmanship guarantee on every job. We do not subcontract and we do not employ commission-based salespeople. Our own experienced team handles every project from the initial survey through to completion and sign-off. Call 0179 329 7084 for a free, no-obligation survey and quote.