This glossary explains the roofing terms Cheltenham homeowners most often encounter — from nail sickness on concrete-tile estates to lead flashing on Victorian terraces and dry-ridge systems required under BS 5534. For advice on your own roof, call Cheltenham Roofing Experts on 0124 235 2251.
Nail sickness
The corrosion and failure of the iron or steel nails that fix roof tiles and slates. Common on Cheltenham's 1960s–70s concrete-tile estates such as Hester's Way and Benhall, it causes tiles to slip even though the tiles themselves remain sound — usually signalling that a full re-roof is due.
Nave / valley
A roof valley is the internal angle where two roof slopes meet, channelling rainwater to the gutter. Valleys are the most leak-prone part of a roof; on Cheltenham properties backing onto trees, autumn leaf fall blocks them and forces water under the tiles.
Lead flashing
Strips of malleable lead used to weatherproof the joints where a roof meets a chimney, wall or valley. Code 4 and Code 5 lead are standard for domestic work. Failed flashing around chimney stacks is the single most common cause of leaks on Cheltenham's Victorian terraces.
Pointing / repointing
The mortar finish between bricks or roof components such as ridge tiles. Repointing renews cracked or missing mortar. Conservation-area and listed properties in Montpellier and Lansdown often require lime mortar rather than modern cement to remain compliant and breathable.
Dry ridge system
A mechanical method of fixing ridge and hip tiles using screws and clamps instead of mortar bedding. Required under BS 5534 on new work, it resists wind uplift and eliminates the recurring problem of ridge tiles loosening as mortar weathers on exposed Cheltenham roofs.
GRP (fibreglass)
Glass-Reinforced Plastic, a seamless flat-roof covering laid as a resin-and-matting laminate. Durable and rigid with a 20–25 year life, GRP is well suited to Cheltenham garages, extensions and dormers where a hard-wearing, walk-on finish is wanted.
EPDM rubber
A synthetic rubber membrane for flat roofs, fitted in a single sheet with few or no joints. Flexible across temperature swings and long-lasting, EPDM is a common choice for extensions and outbuildings across Cheltenham and Gloucestershire.
Fascia and soffit
The fascia is the board along the roof edge that carries the guttering; the soffit is the underside board that closes the gap between the wall and roof edge. Rotten timber fascias are common on older Cheltenham properties and are usually replaced with maintenance-free UPVC.