What is the best material for coving?

Plaster coving is the traditional choice; it's heavy and requires professional installation but provides a high-quality, seamless finish. Polyurethane coving is a modern alternative that is much lighter, pre-primed, and easier for DIYers to install while still looking like plaster. Polystyrene is the cheapest but easily damaged and less professional in appearance.

Why do I need 15% waste for coving?

Unlike skirting, coving mitres are complex. You often lose 200mm-300mm of length for every corner cut you make. If you make a single mistake on a cut, you can easily find yourself a piece short. 15% is the industry standard 'safety' buffer.

What adhesive should I use for coving?

For plaster coving, use a dedicated 'Coving Adhesive' (a powder you mix with water). For lightweight polyurethane coving, use a high-strength grab adhesive or the manufacturer's own jointing glue to ensure the seams don't open up later.

Can I fit coving on top of wallpaper?

No. Coving should always be fitted directly to the plaster of the wall and ceiling. If you fit it over wallpaper, the weight of the coving (especially plaster) can cause the wallpaper to peel away, leading to the coving falling.

What is the best material for coving?

Plaster coving is the traditional choice; it's heavy and requires professional installation but provides a high-quality, seamless finish. Polyurethane coving is a modern alternative that is much lighter, pre-primed, and easier for DIYers to install while still looking like plaster. Polystyrene is the cheapest but easily damaged and less professional in appearance.

Why do I need 15% waste for coving?

Unlike skirting, coving mitres are complex. You often lose 200mm-300mm of length for every corner cut you make. If you make a single mistake on a cut, you can easily find yourself a piece short. 15% is the industry standard 'safety' buffer.

What adhesive should I use for coving?

For plaster coving, use a dedicated 'Coving Adhesive' (a powder you mix with water). For lightweight polyurethane coving, use a high-strength grab adhesive or the manufacturer's own jointing glue to ensure the seams don't open up later.

Can I fit coving on top of wallpaper?

No. Coving should always be fitted directly to the plaster of the wall and ceiling. If you fit it over wallpaper, the weight of the coving (especially plaster) can cause the wallpaper to peel away, leading to the coving falling.

Coving Calculator

Calculate pieces for a seamless ceiling finish.

Room Perimeter (m)

Piece Length (m)

Quantity Order

Mitre Tip: Coving mitres are notoriously difficult because the piece must be held at an angle in the mitre box. Always use a dedicated 'Coving Mitre Box' to ensure your internal and external corners meet perfectly.

Ceiling Elegance: The UK Coving Guide

Profiles & Materials

Coving adds a soft transition between the wall and the ceiling, hiding small cracks that often form in the corner of rooms. From the simple 127mm Gyproc profile to ornate Georgian cornices, choosing the right scale for your ceiling height is vital.

Our **coving length calculator** provides a precise material count based on your room's perimeter, with a built-in allowance for the significant waste generated by corner mitres.

Standard UK Lengths

Retail Standard2.0 Metres

Trade Length3.0 Metres

Gyproc Plaster2.4 / 3.0m

The Mitre Challenge

Coving is unique because it sits at a 45-degree angle to both the wall and ceiling. This means a standard flat mitre cut won't work. You must use a **coving mitre box** that holds the piece in the 'sprung' position (the angle it will sit on the wall).

Always 'measure twice and cut once'. For internal corners, the top edge of the coving is always shorter than the bottom edge. For external corners, it's the opposite.

Fixing Screws

When installing heavy plaster coving, many professionals use a few small screws (galvanised to prevent rust) to hold the pieces in place while the adhesive sets. These are then removed or 'sunk' and filled before painting.

Caulking

No matter how good your mitres are, there will always be tiny gaps. Use a high-quality flexible acrylic caulk for the joints and the top/bottom edges. Unlike silicone, caulk is paintable and will move slightly with the house without cracking.

Pro Tip: Pattern Matching

If you are using ornate 'patterned' coving (like Georgian or Victorian styles), you must match the pattern at the joints. This often means wasting even more material than simple profiles, so consider increasing your order to a **20% waste allowance**.

Coving & Trim FAQ

Project Disclaimer

Coving calculations assume standard rectangular rooms. If your ceiling is vaulted or has unusual angles, consult a professional installer. Plaster coving is extremely heavy—ensure your ceiling structure can support the added weight.