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Coastline Composite Cladding
Composite cladding in six coastal colours, with the full aluminium trim system to match.
Coastline is a true composite board — a rigid PVC core packed with mineral content, capped with a tough ASA weathering skin and embossed with a deep woodgrain face. The boards interlock shiplap-style and nail to timber battens, with an aluminium trim system that starts the run at the bottom and houses the board ends at every corner, edge and opening.
Boards, aluminium trims, end caps and fixings — the complete horizontal Coastline system.
The Board
Coastline Composite Cladding 203mm x 5m
Specification | Detail |
|---|---|
Length | 5m |
Coverage per board | 167mm |
Thickness | 5mm |
Colours | Six |
Fire classification | D-s3, d2 to BS EN 13501-1 |
The number to work to is 167mm, not the board's overall width. Once a board is clipped into the one below it, 167mm of it is on show. A 5m board therefore covers 0.835 m², which is roughly 12 boards per 10 m² before you allow for cuts. Measure off the overall width instead and you'll come up about a fifth short — it's the commonest mistake on a first Coastline order.
Where Coastline can and can't go
Worth knowing before you order, because it's the thing that catches people out.
Coastline is designed for masonry — brick or breeze block — on buildings up to 11m high, fitted at least one metre from a boundary. It should not go on a timber-framed building or a steel-framed dwelling. Eurocell are blunt about it: fit it to either and the product guarantee is gone.
Garden buildings are fine as long as they aren't lived in full time, and again as long as you're fixing to masonry.
On fire, the honest position in one line: Coastline is classified D-s3, d2, and the Building Regulations across England, Wales, Scotland and Northern Ireland are satisfied for combustible systems under 11m and more than a metre from a boundary without any special fire provision. If your job is higher than 11m, or closer than a metre to the neighbour, this isn't the product and we'd rather tell you now.
If the wall you're cladding is a timber garden room or a steel-framed building, uPVC shiplap cladding is the one to look at instead.
The aluminium trim system
This is where Coastline differs most from uPVC cladding. The trims aren't cosmetic clip-on pieces. The starter bar carries the first board and sets the ventilation gap at the bottom; everything else houses the cut ends of the boards at corners, edges and openings, with room for them to move. They go on first, and the job is only as square as they are.
Aluminium Starter Bar, 5m is the first thing on the battens and carries the bottom board. It must always be used, and it sets the ventilation gap at the bottom of the wall. Aluminium Head Trim, 5m does the same job at the top, closing off the batten line. Both come in black only — once the wall is boarded neither one is visible, so there's nothing to match and nothing lost. Aluminium End Closer, 5m caps the open end of a run where the cladding stops against something.
Corners
90° External Corner, 5m and 90° Internal Corner, 5m take the boards round a corner cleanly. Each has a matching end cap to finish the top or bottom of the profile — external cap, internal cap.
Windows and openings
Aluminium Window Head Trim, 5m goes over the opening and throws water clear, with a matching end cap. Eurocell's instruction is that it goes above every window without exception. Round the reveal itself you've got Window Reveal Trim, 5m and Window Reveal Corner Trim, 5m.
Joining a long run
Butt Joint, 5m joins two boards end to end where a run is longer than 5m, and leaves room for movement. Worth knowing at the battening stage: wherever you're going to use one, you need two battens fixed side by side behind it.
Fixings
Stainless Steel Fixing Nails, pack of 250, one at every board-and-batten intersection. Stainless only — anything else will stain an Oyster White wall inside two winters.
Every trim you can see on the finished wall — corners, end closers, window trims and caps — comes in the same six colours as the boards. The starter bar and head trim are black, and both are hidden behind the boards.
Colours
Six New England-inspired colours: Anthracite Grey, Moondust Grey, Oyster White, Pigeon Blue, Soft Green and Taupe. Eurocell describe it as a through-colour board, so a scratch or a score doesn't show a different colour underneath and there's nothing to repaint.
Colour is a hard thing to judge on a screen. If you're deciding between two, ring us and we'll sort you a sample before you commit to a full elevation.
What it costs to clad a wall
Composite is not a like-for-like swap for uPVC on price, and it's the trims that catch people out rather than the boards. A run of Coastline needs a starter bar, a head trim and a corner or an end closer at each end before a single board goes up — and those are aluminium, not plastic, which is a different order of cost per length. On a small elevation with two corners and a window in it, the trims can come to more than the boards.
That's not a reason to avoid it. It's a reason to price the whole job before you decide, rather than comparing board prices and getting a shock at the checkout. Send us the measurements and we'll break it down properly — boards, trims, caps and fixings, the lot.
If the number comes back higher than you wanted, uPVC shiplap cladding does the same protective job for a good deal less, and on a rear elevation or an outbuilding most people can't tell the difference from the garden.
Fitting it — and the one thing that matters most
Coastline goes on 38mm × 25mm timber battens fixed to sound masonry, at 500mm centres at the most. The aluminium goes on first — starter bar, corners, reveals, head trim — then the boards interlock up the wall, nailed through the flange as you go so nothing shows on the face.
Now the part that matters most: the wall needs to breathe.
Coastline is designed to sit on a ventilated cavity. Air comes in at the bottom, travels up behind the boards and leaves at the top, and that airflow is what keeps the boards sitting flat and true for the life of the wall. So the gaps aren't tolerances to be tidied up - they're doing a job.
Leave them open: under the starter bar, below the soffit, and under every window cill. No silicone, nothing trimmed over. For the same reason the cavity stays clear, so insulation doesn't go behind the cladding.
Get the ventilation right and the rest of the job is straightforward. The exact clearances, batten positions and cutting tolerances are all in Eurocell's installation guide - download the Coastline installation guide. Worth a read before you start, and if you're unsure at all, ring us and we'll talk it through.
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Coastline or shiplap?
Straight answer: if the wall is going to be looked at closely, Coastline. If it's going to be looked at from the garden, shiplap.
Coastline gives you a deeper, more convincing woodgrain, a flatter wall and a set of colours you can't get in uPVC. It costs more per square metre and considerably more in trims, and it takes longer to fit. It also has to go on masonry — that alone decides a lot of jobs.
uPVC shiplap cladding is lighter, cheaper, faster to fit and completely maintenance-free. For sheds, garages, timber garden rooms, dormers and rear elevations it's the one most of our customers buy, and it does the job for decades.
Plenty of people use both on the same property — Coastline on the front, shiplap round the back. There's nothing wrong with that at all
Frequently asked questions
What area does one Coastline board cover?
167mm once it's clipped in, over a 5m length — about 0.835 m² a board, or roughly 12 boards for every 10 m² of wall before cuts. Work off the 167mm figure rather than the board's overall width, or you'll order about a fifth short.
Why does Coastline need ventilation behind it?
Because the system is designed around a ventilated cavity. Air enters at the bottom of the wall, passes up behind the boards and leaves at the top, and that movement of air is what keeps the boards flat and stable through a hot summer. It's why the gaps under the starter bar, below the soffit and under the cills stay open, and why insulation doesn't go behind the cladding. The clearances are in the installation guide.
Can Coastline be fitted to a timber garden room or a steel-framed building?
No. It's designed for masonry — brick or breeze block — on buildings up to 11m, at least a metre from a boundary. Fitting it to a timber or steel-framed building invalidates the guarantee. Garden buildings are fine if they're not lived in full time and you're fixing to masonry. For a timber garden room, use uPVC shiplap instead.
Is composite cladding better than uPVC cladding?
Not better, different. Coastline is a thicker, more rigid board with a deeper woodgrain and a flatter finish, in colours uPVC doesn't come in. Standard uPVC shiplap is lighter, cheaper, quicker to fit and will go on substrates Coastline won't. Both are maintenance-free. Pick on finish, budget and what you're fixing to — not on durability.
Does Coastline composite cladding fade?
The face is an ASA weathering skin - the same material used on cladding and window profiles precisely because it holds its colour in UV. Eurocell describe Coastline as a through-colour product, so a scratch or a score doesn't reveal a different colour underneath rather than showing up as a pale mark.
Do I need the aluminium trims, or can I fit the boards on their own?
You need them. Without them the board ends are open to the weather, there's no movement allowance where the boards run into a corner or an opening, and the starter bar is what sets the ventilation gap at the bottom of the wall. Fitting without them
invalidates the guarantee.
How do I clean it?
Warm water and a non-abrasive mild detergent, now and again. Never use solvents. Keep creosote and bitumen-based products off it. Most other building materials wipe off without doing any damage.
Do you deliver Coastline composite cladding?
Yes, across mainland UK, and most Coastline orders clear our free delivery threshold comfortably. Collection is available. We don't deliver to the Republic of Ireland or Northern Ireland. Full delivery costs and lead times.