Chapter one
Post-war roofs on the Wick and Toddington edge
Houses that closed the gaps between Wick, Lyminster and Toddington have reached the age where fixings, battens and underlay need a proper look.
Wick and Toddington became part of Littlehampton in 1901, and post-war house building on the outskirts later absorbed Wick, Lyminster and Toddington into one continuous edge of town. What any individual Toddington roof is covered in varies from house to house, so a survey begins by reading the roof in front of us. If it turns out to be an interlocking concrete tile, the useful facts are Marley's expectation of around 60 years, which it says is not a guarantee, and MyBuilder's lower figure of 30 to 50 years before replacement. Between those two sits a long grey area, and the survey is how we place your roof in it.
At a glance
- Wick and Toddington joined Littlehampton in 1901
- Post-war building absorbed the villages around them
- Concrete tiles are often put at 30 to 60 years

1.1 Nails, battens and underlay
The tiles are often the last thing to fail. Beneath them, the slim timber battens can soften where leaks have run for years, nails rust through, and the underlay may have perished or never been laid at all. That is the sheet of membrane hung beneath the battens to catch what gets past the tiles. Where access allows, we lift a few tiles on each slope and take photographs of the timber and underlay below. Those pictures settle whether a repair will hold or the covering has to come off. Faults gathered on a single slope usually point to repair, while the same fault on every slope points to re-roofing. Verges need the same attention: Marley reads BS 5534 as requiring perimeter tiles to be fixed twice, so a verge held only by mortar is worth upgrading.

1.2 Loft ventilation and condensation
A damp loft is not always a leak. Moist air rising from the rooms below meets the cold underside of the roof and condenses there, and the staining that follows looks like a leak. Marley, quoting BS 5250, says a roof with high-resistance underlay needs a continuous 10 mm gap along the eaves when the pitch is over 15 degrees, and 25 mm when it is 15 degrees or less. We check the eaves for blocked or missing ventilation before blaming the tiles. Where an older roof is stripped, the new work should bring ventilation up to current guidance, and a thermal upgrade under Part L may follow once more than half the roof surface is renovated. Our roof replacement page covers the full process.
Ventilating a cold pitched roof
- Eaves, pitch over 15 degrees
- 10 mm continuous along the eaves
- Eaves, pitch of 15 degrees or less
- 25 mm along the eaves
- High-level extra
- Continuous 5 mm over 35 degrees, or a span over 10 m
- Guidance followed
- BS 5250, as set out by Marley (high-resistance underlay)
Source: Marley, How do I ventilate a cold roof?, fetched October 2026





