Harling, roughcast or pebbledash: what's the difference?

By Paisley Gutter Care. Updated 11 November 2026.

They're all rough, stony finishes on an outside wall, and people use the names loosely. The real difference is how the stones get onto the wall. Harling and roughcast have the stones mixed into the final wet coat, which is then thrown on. Pebbledash has the stones thrown onto a coat that's already on the wall.

Harling

Harling is the old Scottish word, and it's the one you'll hear most from tradesmen and older neighbours round Paisley. Traditionally it was a lime-based mix with small stones or gravel in it, flung onto the wall with a trowel or a harling scoop so it landed with a rough, lumpy texture. Castles, tower houses and old cottages all over Scotland were harled to keep the rain out of soft stone.

Today, "harling" usually just means roughcast, and most modern harling is cement-based. On a genuinely old building, though, especially a listed one, the original lime harl matters. Lime lets the wall breathe. Cover old stone in hard cement and damp can get trapped behind it.

Roughcast

Roughcast works the same way as harling. Stone chips or gravel are mixed into the final wet coat, and the whole lot is thrown on, so the stones are bedded right in. You get a coarse, even texture, often left in its natural colour or painted afterwards. That's why it's also called wet dash.

It's tough, it hides uneven walls and it shrugs off rain, which explains why so many Scottish council houses and semis from the 1930s to the 1970s were finished with it.

Pebbledash

Pebbledash, also called dry dash, is done in two stages. A smooth coat of render goes on first, and while it's still wet, small pebbles or spar chips are thrown at it so they stick in the surface. The stones sit on the outside rather than being mixed through, so the finish looks more like a carpet of separate pebbles. Rub a hand over it and you'll often knock a few off. Rub roughcast and you won't.

And render?

Render is the broad word for any coat put on an outside wall. When people say "render" they usually mean a smooth or lightly textured one: sand and cement painted over, or modern through-coloured renders such as K-rend and other monocouche and silicone finishes. Our rendering page goes through those.

Side by side

Which one has my house got?

In Paisley and the rest of Renfrewshire, the answer is usually roughcast. Much of the housing built from the 1930s onwards, from Foxbar and Ferguslie Park to the cottage flats in Johnstone and Linwood, has a wet-dash finish. Pebbledash turns up too, and smooth render is more common on newer homes and houses that have been done up recently. True lime harling is mostly on older buildings: cottages, churches and listed properties.

A quick test: look closely. If the stones look bedded into the surface and the whole thing is one rough texture, it's roughcast. If you can see a smoother coat between separate pebbles, it's pebbledash.

Why it matters

Mostly, it matters for repairs. A patch needs to match what's already there, both the method and the stones. Get it wrong and the repair stands out a mile. On an old stone building, the mix matters too, because putting cement on a wall that was built for lime can cause damp problems later.

It also matters for price. Our roughcasting cost guide has typical figures, and the roughcast repairs page explains when a patch is enough and when the whole wall needs redoing.

If you're in Paisley or Renfrewshire and your walls need work, see roughcasting and harling in Paisley or roughcasting across Renfrewshire, or use the form below.