Chapter one
Fixing roofs against West Wittering's sea weather
With open water to the south and the harbour mouth to the west, how a roof is held down counts for more than its looks.
Few places in this part of Sussex sit as close to open water as West Wittering. The Victoria County History places the parish with the open sea on its southern boundary and the mouth of Chichester Harbour on its western side, and records that the coast has constantly suffered erosion. A roof in the village therefore meets gales, driving rain and salt air with little shelter. Tile fixings, ridge bedding and the nails behind every course are the parts that have to hold, and they are the parts we examine most closely on a survey. Photographs of the weak points on your own roof go into the survey, so every explanation can be checked against a picture.
At a glance
- The parish meets open sea and the harbour mouth
- Shallow roofs under 30 degrees can be pulled hard by wind
- Each fixing plan is written for the individual site

1.1 Pitch and suction
Shape matters as much as materials. Marley's wind guidance singles out pitches under 30 degrees, where the side taking the wind can feel severe suction, lifting tiles clear rather than seating them. A near-flat extension or a shallow porch roof can ask more of its fixings than a steep main slope. For the maker's wind calculation, Marley points to BS EN 1991-1-4, a method that starts from the basic wind speed at the site and applies corrections for terrain, topography and building height. We do not assume an exposure figure for a village. The covering's own data sheet and the tile maker's technical team set the specification for your address.

1.2 Nails, clips and the ridge
Wienerberger wants every roof fixed to a specification written for that plot, allowing for its location, its altitude and the local wind exposure. We work to that principle, ask the tile maker for the specification whenever a roof is re-covered, and keep a copy for you. At the ridge and hips, the 2014 revision of BS 5534 means mortar-bedded tiles also need their own fixing into the timber beneath; the alternative, a clipped dry-fix system, is tested to BS 8612:2018. Along the eaves and verge, where wind tears first, we check that each tile is nailed or clipped, not just resting. Rusted nails are common on an older roof, and a couple of lifted tiles tell us how far the corrosion has gone. Our ridge tile repairs page explains the options in more detail.
What sets the fixing on a coastal roof
- Code of practice
- BS 5534:2014+A2:2018
- Wind calculation method
- BS EN 1991-1-4, then site factors (Marley)
- Pitch under 30 degrees
- Wind side can feel severe suction (Marley)
- Site specification
- Place, height and wind exposure (Wienerberger)
- Dry-fix systems
- BS 8612:2018
Source: BSI; Marley; Wienerberger, fetched October 2026





