Orange-red staining on a coastal wall is not rust, and it is not the render failing. It is alive, it is extremely common this close to the sea, and it comes off. Here is how to tell it from everything else without leaving the ground.
Salt mist and windblown sand off the coast settle across render here and keep it damp for longer than an inland wall ever is. You will find red algae on the exposed elevations, green algae on the shaded ones, and years of both leaving a general darkening that reads as weathering.
Trentepohlia — the orange-red staining that people spend weeks looking for a rusting gutter bracket to explain. There is no bracket. It carries an orange pigment despite being an alga, it thrives on salt-damp render, and it is the single most common thing we treat within a few kilometres of the sea. It clears very well.
The flat green film on whichever elevation dries slowest. No thickness to it at all, which is exactly how you tell it apart from anything else at a glance. It is the easiest of the three to clear, and dealing with it early keeps the wall from offering heavier growth somewhere to start.
Not one organism but the leftovers of several, layered up over years with windblown sand through them. On a house that has stood empty through a few winters this is often most of what you are looking at. It lifts, which is why the before-and-after on a coastal property is usually the most dramatic thing we photograph.
The wrong name buys the wrong treatment, and that is how people end up disappointed.
Send a picture of the worst elevation and your Eircode. Colour, depth, how far it has run and which side started tells us nearly everything we need.
Red algae needs a proper dwell time before anything shifts. Green film clears quickly. Sand and weathering wash down. Three different jobs, three different figures.
You get told what it is in plain terms and what it takes to shift. If the honest answer is that it can wait another season, that is what you will hear.
A one-minute check and a short read, both free.
What Trentepohlia actually is, why salt air suits it so well, why it is so consistently taken for rust, and what clears it.
The Render Check runs through what to look for from the ground in about a minute. On a house you only see at weekends it is worth running before you commit to anything.
We cover Ballymoney along with Seafield, Sandycove and Tara Hill, through the houses set back from the strand and the holiday properties along the coast road.
Red algae is on the fascia and the tiles as often as the render, and salt-damp gutters fill faster than anyone expects.
What people ask once they have stood back and had a proper look.
It has almost certainly been building for a while. Trentepohlia starts as a faint tint and becomes obvious only once the colony is established. A damp couple of seasons brings it on noticeably, which is why people so often feel it arrived overnight.
Dirt sits heaviest where water runs down and thins out where it does not, and it wipes. Growth spreads outward across a whole elevation regardless of where the water goes, and it does not wipe. A photograph from the ground settles it either way.
Whichever elevation sees least sun holds damp for longest after every shower, and damp is the one thing growth cannot manage without. It usually means the back, or whichever side sits behind a hedge or a taller building.
It does. Stone, brick and blockwork are porous and hold growth in the joints as much as the faces, and they take a treatment well throughout. The mortar lines usually come up as much as the stone does.
We keep the full library on the main softwashing page: each organism, what it does to render, and what shifts it.
One photograph from the ground is more use to us than any description, and quicker for you.
Phone: 089-949-1525
WhatsApp: Send a couple of photos
Email: info@eireshine.ie
Send a picture and you will have the answer today, along with a straight view on whether it is far enough along to be worth treating yet.
A phone photo is fine. It does not need to be a good one.
