Chapter one
Salt air and the Selsey roofline
On a headland bounded by sea on two sides, fascias, soffits and gutters gather salt that rain never reaches.
The Victoria County History says Selsey was once an island, and that about half a mile of land has been washed away from the point since Domesday. Today the Bill is bounded by the sea to the south and east. Salt reaches every part of a house here, but it lingers longest where rain cannot wash it off. HomeBuilding makes the point for soffits and fascias in marine air: they pick up salty deposits, the rain misses them, and staining or corrosion of some metal surfaces becomes a possibility. Sheltered spots collect the most, such as the underside of a porch overhang or the board hidden behind a gutter, which is why our survey photographs include them.
At a glance
- Rain cannot rinse the underside of the eaves
- Houses built before 2000 may hold asbestos
- Gutters slope slightly towards their outlet
1.1 Washing, painting and what lasts
The fascia is the upright board along the eaves carrying the gutter, and the soffit is the flat panel underneath the overhang. In coastal air timber wants repainting on a regular cycle and plastic wants washing. The zinc maker VM Zinc advises a rinse in clean water two or more times a year, which matters on extensions and dormers clad in zinc, and it classes the first kilometre from the shore as its harshest zone. MyBuilder's guide gives 10 to 20 years as the typical gap between fascia and soffit replacements, though retailers claim longer. Lifespan depends on exposure, installation and upkeep, and no figure is a promise.
1.2 Gutters, and what hides behind the board
A run of gutter should slope slightly towards its outlet. Manufacturers commonly recommend somewhere between 1:600 and 1:350 depending on the system, and one maker asks for brackets at 900 mm centres or closer. When a gutter sags we check the fascia behind it, since rot or loose fixings there are often the cause, and we check that downpipes discharge clear of the wall. MyBuilder's guides, updated 21 August 2026, give £30 to £70 per metre for guttering and £80 to £150 per metre for fascia.
1.3 A word on soffits and asbestos
HSE guidance is blunt about older buildings: if the place was built or refurbished before 2000, treat it as containing asbestos until shown otherwise. External soffits are one of the places it lists. Asbestos insulating board is hard to tell from modern board by eye, and removing it is mostly licensed work. Where a soffit could be that material, work halts until we know what it is. Our gutters, soffits and fascias page sets out the repair and replacement options.
Salt exposure bands for zinc
- Nearest the shore
- First kilometre: the harshest zone
- Middle band
- 1 to 3 km inland
- Further back
- 3 to 20 km: low maritime influence
- Rinsing
- Clean water, two or more times a year
Source: VM Zinc FAQ, fetched October 2026





