Will render crack on an exposed elevation?

Cement render on a solid wall commonly does, because it is brittle and non-breathable. Lime render on traditional fabric, or a modern through-coloured render on a drained and ventilated system, both perform far better.

Is timber cladding a bad idea near the sea?

Not inherently. Untreated softwood with face-fixed standard fixings is. Thermally modified or naturally durable timber, back-ventilated and fixed with appropriate-grade stainless, performs well and silvers evenly.

Do I need special glazing?

Coastal specification finishes and appropriate hardware, yes — and it is worth checking the warranty terms, because many are void within a set distance of the sea unless the coastal specification was ordered.

Does the planning system have views on materials here?

Strongly, in Conservation Areas and the AONB. Slate size and lap, render colour and window materials are all frequently conditioned, so choose them at design stage rather than after approval.

Materials · Cornwall

Building on the Cornish coast — materials that survive, and the ones that photograph well for two years

Cornwall sits in one of the most severe wind-driven rain exposure zones in the UK, and near the coast salt adds a corrosion problem on top. Material choices that are perfectly sound inland fail here, and they fail in a predictable order: fixings, sealants, coatings, then the substrate.

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The four failure points

Almost every coastal defect we are called to look at traces to one of these.

Fixings — standard grade stainless or galvanised steel is not sufficient in a salt-laden atmosphere; specification grade matters
Sealant-dependent junctions — any detail relying on mastic alone has a service life measured in a few years
Coatings on timber and metal — south-west facing elevations weather several times faster than sheltered ones
Cavity and drainage detailing — water gets in; the question is whether the construction lets it back out

What has worked here for two centuries

Slate hanging on the weather elevation, lime render on solid walls, deep reveals, generous overhangs where the roofscape permits, and modest openings on the exposed side with the glazing concentrated where it is sheltered. These are not nostalgia — they are the reason the old buildings are still standing.

Modern materials that hold up

Through-coloured renders on a drained and ventilated system, fibre cement and thermally modified timber rainscreens, marine-grade fixings, and aluminium or high-quality composite windows with a coastal-specification finish. The unifying principle is drained and ventilated rather than face-sealed.

Frequently asked

Straight answers.

Will render crack on an exposed elevation?: Cement render on a solid wall commonly does, because it is brittle and non-breathable. Lime render on traditional fabric, or a modern through-coloured render on a drained and ventilated system, both perform far better.
Is timber cladding a bad idea near the sea?: Not inherently. Untreated softwood with face-fixed standard fixings is. Thermally modified or naturally durable timber, back-ventilated and fixed with appropriate-grade stainless, performs well and silvers evenly.
Do I need special glazing?: Coastal specification finishes and appropriate hardware, yes — and it is worth checking the warranty terms, because many are void within a set distance of the sea unless the coastal specification was ordered.
Does the planning system have views on materials here?: Strongly, in Conservation Areas and the AONB. Slate size and lap, render colour and window materials are all frequently conditioned, so choose them at design stage rather than after approval.

Building somewhere exposed?

Tell us the orientation and how close you are to the water — that drives the specification.

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