The roofing terms you are most likely to encounter, explained in plain English with local relevance for Salisbury and Wiltshire homeowners.
When you get a roofing quote or survey report, it often comes with technical terms that are rarely explained. This glossary covers the terms that matter most for Salisbury properties — from nail sickness on estate housing to lime mortar on conservation-area buildings. If anything here is unclear, call us on 0172 223 9611 and we will explain it in relation to your specific roof.
The progressive corrosion of the galvanised steel nails that fix roof tiles, common on 1960s-70s concrete tile roofs across Salisbury estates. As the nails rust through, tiles lose their fixing and slip. It is the single most common reason older Salisbury roofs need repair or replacement, and typically affects a whole roof at a similar age.
Strips of malleable lead sheet used to weatherproof the junctions where a roof meets a wall, chimney or other surface. Correctly specified lead (Code 4-5 for most domestic work) and properly formed soakers last 60-100 years. On Salisbury properties, failed or undersized lead flashing at chimney bases is a frequent source of leaks.
The tiles that cap the horizontal apex where two roof slopes meet. Traditionally bedded on mortar, they are among the most exposed elements of a roof. On exposed Salisbury sites like Tidworth and Shaftesbury, ridge mortar recedes faster and ridge tiles can loosen in high winds, making them a priority winter maintenance item.
Glass Reinforced Plastic, a seamless liquid-applied flat roofing system that cures into a hard waterproof laminate. It is our standard recommendation for flat roofs in Salisbury, offering a 25-year guarantee and 30-40 year lifespan. GRP requires dry conditions above 5°C to cure correctly during installation.
Ethylene Propylene Diene Monomer, a synthetic rubber membrane used for flat roofing, supplied in large single sheets that minimise joints. EPDM suits larger flat roof areas and tolerates installation in damper conditions better than GRP. It offers a 25-35 year lifespan and is a common alternative for Salisbury extensions and garages.
A traditional masonry mortar made with natural hydraulic lime rather than Portland cement. It is weaker and more breathable than cement, which is essential for pre-1920 brick and stone. On Salisbury conservation-area and Victorian properties, lime mortar is required for repointing to prevent the brick spalling that hard cement causes.
The fascia is the board running along the roof edge that carries the guttering; the soffit is the underside board closing the gap between the fascia and the wall. On Salisbury properties, timber fascias rotted by gutter overflow are commonly replaced with maintenance-free UPVC, which also improves roof ventilation when vented soffits are fitted.
The complete removal and replacement of a roof covering, including stripping old tiles, replacing felt and battens, and laying new tiles. Re-roofing becomes the right choice on Salisbury properties when nail sickness exceeds 30-40% of tiles or the underlay has failed widely. A typical 3-bed semi re-roof takes 3-5 days and includes scaffolding, disposal and a guarantee.
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