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What sizes does plaster coving come in?

Author

Michael King

Updated on March 19, 2026

What sizes does plaster coving come in?

Coving is most commonly seen in four sizes: 90mm (3½”), 100mm (4″), 127mm (5″) and 135mm (5¼”).

Is plaster coving better than polystyrene?

Polystyrene coving is often thought to be the cheaper choice, so it’s ideal for smaller budgets or if you just want a smaller, plain profile. Polystyrene coving is also more absorbent than plaster coving, so it tends to need more coats of paint to achieve a smooth finish.

How do I know what size coving to buy?

Rule of thumb: The higher the ceiling in a room the bigger the cornice you can use. Large cornice used in a room with low ceilings will create an out of proportion effect and appear to shrink the room. 50mm – 70mm (2 – 2.75 inch) coving for ceilings lower then 2.75 metres.

Can you plaster coving?

You can also buy coving in different materials, although plaster is by far the most common. Plaster coving is typically purchased in pre-cut lengths, and you can also buy ready-made corner pieces to make fitting much easier.

Is coving easy to fit?

Often it can be a relatively simple task that can be undertaken as a DIY project, with it being installed quickly and easily. Whatever size of coving you choose, the installation and cutting of internal and external coving mitres is done in exactly the same way.

What is the best type of coving?

What are Plaster and Polystyrene Coving? Plaster coving used to be the most authentic and best quality coving on the market.

Can I use no more nails for plaster coving?

Unibond No More Nails is a grab adhesive that is perfect for fixing coving made of plastics to a porous surface, such as plaster or plasterboard. It works best where at least one of the surfaces is absorbent, but is also suitable where both surfaces are porous, such when fitting polystyrene or plaster coving.

What is the point of coving?

Coving & cornice is perfect for adding interest to the tops of walls, giving them a stylish and elegant finishing touch to really set off a room. It also avoids the décor looking unfinished and as if there is something missing in the detail of the room.

Can I fit coving myself?

Fortunately, you don’t have to bring in a professional to help you with fitting your coving. Often it can be a relatively simple task that can be undertaken as a DIY project, with it being installed quickly and easily.