Roof Survey in Cardiff

Cardiff's character as a coal export port drove the construction of tens of thousands of terraced homes from the 1860s through to the First World War. The areas around Pontcanna, Canton, Roath, and Splott were built out in successive waves of development, each producing rows of two-up two-down and bay-fronted terraces roofed with Welsh slate or clay tiles. Many of these properties still carry their original roofing materials.

Welsh slate has long been associated with Cardiff's roofing tradition, and the region's quarrying industry produced roofing materials that were exported from the city's own docks. In domestic properties, Welsh slate is known for its durability - a well-maintained slate roof can last over a century - but slate roofs of this age typically show accumulated wear. Common findings in Cardiff include nail sickness on the original iron fixings, slipped slates where nails have corroded through, cracked ridge tiles, and open mortar joints at chimney flashings.

Post-war housing in Cardiff's outer suburbs - Llanishen (CF14), Rumney (CF3), Llanrumney (CF3), and Ely (CF5) - tends to use concrete or clay tiles. These properties were built during the council house construction programmes of the 1950s and 1960s, and the original roofing on many has reached the point where condition assessment is needed. Concrete tiles from this era can show significant surface erosion and mortar bedding failure at ridges. Our inspectors cover all of these property types and report accurately on condition regardless of roof type.

Cardiff's building stock also includes significant use of Pennant stone and Bath stone - the same materials used in many of the city's Victorian commercial buildings and civic structures. Where properties use masonry construction at parapet walls or chimney stacks, the stone condition feeds directly into the roof assessment, as failing stonework at these junctions allows water to bypass flashings.

Cardiff receives approximately 1,100mm of rainfall per year, placing it firmly among the wetter UK cities. Much of central Cardiff occupies reclaimed marshland at low elevation, but the northern suburbs and the foothills of the Brecon Beacons face significantly higher rainfall and wind exposure. Properties in CF15 (Radyr, Morganstown) and CF14 (Whitchurch, Thornhill) can experience wind-driven rain at intensities that test even well-maintained roofing systems.

Moss and algae growth is a consistent issue on north and east-facing roof slopes in Cardiff. Clay and concrete tiles in particular provide a textured surface where spores establish quickly. A mature moss layer traps moisture against tile surfaces, increases the weight loading on batten fixings, and works under tile laps during freeze-thaw cycles in winter. On older slate roofs, retained moisture accelerates the deterioration of the underlying felt or boarding and contributes to ongoing nail corrosion.

Flood risk is a specific consideration in parts of Cardiff. Cardiff's position between the Rivers Taff and Ely means historic flood events have affected properties in Grangetown (CF11), Canton (CF5), and areas adjacent to Cardiff Bay (CF10). While flooding primarily affects ground floors, extreme weather events can cause associated roof damage through debris impact and storm surge conditions. Our survey reports note local flood risk designations and their implications for building maintenance.

Gutters and downpipes on Cardiff properties are consistently identified as a maintenance concern. Autumn leaf fall, combined with moss washed from roof surfaces during heavy rain, blocks gutters rapidly in the city's tree-lined residential streets. Overflowing gutters run water down the face of Victorian brickwork and Pennant stone, penetrating mortar joints and tracking into internal cavities. Our inspectors check all rainwater goods as part of every survey.

Our Cardiff roof surveys are visual inspections carried out from ground level and from close access points where safety permits. Every report covers the following seven areas.

• Roof covering condition - We examine slates, tiles, or membrane covering across the full roof area, identifying slipped, cracked, or missing units and assessing the extent of any surface weathering or moss accumulation.
• Ridges and hips - Mortar-bedded ridges are a common failure point on Cardiff's older housing stock. We inspect mortar integrity, loose ridge tiles, and hip tile alignment along each ridge and hip run.
• Flashings and soakers - Lead flashings at chimney abutments and parapet walls are assessed for splits, open laps, and areas where inappropriate sealants have been applied over aging lead.
• Chimney stacks - Cardiff terraces frequently carry multiple chimney stacks serving fireplaces on multiple floors. We inspect brickwork pointing, flaunching mortar, pot condition, and capping details on every stack visible during the survey.
• Gutters and rainwater goods - Joint integrity, bracket fixings, overflow points, and outlet blockages are all noted. We cover both cast iron gutters common to Victorian properties and uPVC systems fitted during later upgrades.
• Roof lights and dormers - These are inspected for glazing seal condition, kerb flashing integrity, and any frame deterioration that may be allowing moisture to track into the roof structure.
• Flat sections - Extensions are assessed for surface condition, drainage fall, membrane integrity at edges and penetrations, and kerb flashing condition at abutments with the main roof.

The written report grading all defects by urgency - immediate, within one year, or monitor - is delivered by email within 48 hours of the inspection. Photographs are included for each defect noted. The report is formatted to be usable as a pre-purchase negotiation tool or as a maintenance schedule for ongoing ownership.

Cardiff has some of the largest new-build development programmes in Wales underway. Plasdu, a Garden City scheme in north-west Cardiff, is delivering up to 7,000 new homes over a fifteen-year programme. Within Plasdu, Redrow's Churchlands development in Lisvane offers three, four, and five-bedroom eco-electric homes from £499,000 to £760,000, heated by air source heat pumps. Redrow's Maes Yr Haf at Radyr offers Heritage Collection homes from £486,000 to £628,000.

The Parish at Llanilltern Village (CF5) is a Persimmon Homes development with 1,500 homes planned across multiple phases, currently selling three, four, and five-bedroom properties from £334,995 to £444,995. In Old St Mellons, Dandara's Sant Silian offers three and four-bedroom homes from £389,995. Taylor Wimpey has also announced a north-east Cardiff development of up to 2,500 homes in its first two sections, with construction expected to begin in 2026.

New-build properties carry a developer's two-year defect warranty, but roof defects in this window are not always obvious without a detailed inspection. On large Cardiff sites with multiple subcontractors, fixing specification, tile overlap, and flashing detailing can vary significantly between plots. Our snagging surveys include full roof inspection as a standard item. We recommend booking before the two-year warranty expires and well before any structural warranty period ends.