Domakihub How to Fit Coving: A Clean Finish for Every Room
Cut, mitre, and fix coving like a pro — from first mark to final paint.
Reviewed by Domakihub home & decor pros · 2026-06-23 · 5 min read
Coving — that moulded strip that bridges wall and ceiling — is one of the most satisfying finishing touches you can add to a room, and it makes an immediate difference in holiday rentals, hotels, and private homes alike. The video above walks through the full process visually; this guide adds the material choices, measurement logic, and corner-cutting technique you need before you pick up a saw. No building permit or licensed trade is required for standard decorative coving, but if you are fixing into a wall that conceals pipes or electric cables always locate services first.
Choosing the Right Coving for Your Space
Plaster coving is the traditional choice: dense, paintable, and convincingly period in older properties. Expanded polystyrene (EPS) and polyurethane mouldings are far lighter — ideal for ceilings where you want minimal adhesive load — and they cut cleanly with a fine-tooth saw. For holiday rentals or high-humidity rooms such as bathrooms, moisture-resistant polyurethane outlasts plaster and needs no special sealer.
Profile size matters too. A 90 mm or 100 mm profile suits standard 2.4 m residential ceilings; larger 127 mm or 135 mm profiles work in rooms with higher ceilings or where you want a more classical look. Always buy 10–15 % more length than your room perimeter to allow for waste at corners and inevitable mis-cuts.
Tools and Materials You Will Need
You need a coving mitre box (or a mitre saw set to 45°), a fine-tooth panel saw or tenon saw, a filling knife, coving adhesive (often sold as bonding compound or cornice adhesive), sandpaper (120 grit), a pencil, tape measure, spirit level, and decorator's caulk for the final gap fill. For plaster coving, dampen both the back of the moulding and the wall/ceiling surface lightly before applying adhesive — this prevents the plaster substrate from drawing moisture out of the glue too quickly and causing poor adhesion.
Support battens are useful for longer runs: temporary nails or screws driven just below the coving hold each length in position while the adhesive cures (typically 20–40 minutes). Remove them once the adhesive has firmed up and fill the small holes before painting.
How to Fit Coving: Step by Step
- 1
Mark the guide lines
Measure the depth of your coving profile — the distance it sits out from the wall and down from the ceiling. Use this measurement to draw a pencil line along the entire wall perimeter at ceiling height, and a corresponding line on the ceiling. These two parallel lines define exactly where the back edges of the coving will sit, giving you a precise gluing surface and preventing misalignment as you work your way around the room.
- 2
Cut the internal and external corner mitres
Internal corners (inside corners of a room) need a 45° mitre cut so that two lengths meet cleanly. Place the coving upside-down in a mitre box — ceiling face against the base of the box, wall face against the upright — and cut left and right pieces as a mirror pair. External corners (bay windows, chimney-breast reveals) use the same 45° angle but the cut direction is reversed. Always cut slightly long and test-fit before applying adhesive; you can trim, but you cannot add length back.
- 3
Apply adhesive and fix the straight runs first
Squeeze or trowel coving adhesive onto both the wall and ceiling contact faces of the moulding. Press the length firmly onto the guide lines and twist slightly to spread the adhesive evenly. Drive one or two temporary support nails below the coving to hold it while the adhesive grabs. Wipe away squeeze-out immediately with a damp cloth before it skins over. Work the straight runs first, then tackle the corners last — this is the order that minimises waste.
- 4
Fit and fill the corners
Offer up the mitre-cut corner pieces and check the joint tightness. Small gaps of 1–2 mm are normal and will be invisible once filled; gaps wider than 3 mm indicate a mis-cut and the piece should be re-cut. Once you are satisfied with the fit, apply adhesive and fix the corner pieces the same way as the straight runs. Once cured, use a flexible interior filler or decorator's caulk to close any remaining gaps at the corner joint and along the top and bottom edges where coving meets ceiling and wall.
- 5
Sand, prime, and paint
Once all adhesive and filler has fully cured (leave overnight for plaster coving), lightly sand any ridges with 120-grit paper. Apply one coat of diluted PVA or a proprietary mist coat to seal plaster or EPS coving before emulsioning. Finish with two coats of the same ceiling or wall paint — or a contrasting colour if the design calls for it. Use a small cutting-in brush to stay crisp on the wall and ceiling edges.
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FAQ
- Can I fit coving over an existing textured or artex ceiling?
- Yes, but you need to scrape or sand away the texture in the contact zone (the two strips your guide lines define) before applying adhesive. Bonding directly onto textured surfaces leads to poor adhesion and eventual sagging. If the artex pre-dates 2000 and looks stippled or swirled rather than flat, test for asbestos fibres before sanding — disturbing asbestos-containing materials requires a licensed professional.
- What is the difference between coving and cornice?
- Coving is a plain curved or coved profile — simple and cost-effective. Cornice is an architectural moulding with decorative detail such as egg-and-dart or dentil patterns, typically made from plaster and associated with period properties. Installation technique is the same; cornice just demands more care when cutting so the decorative repeat aligns at corners.
- My walls are not perfectly square — will the mitres still fit?
- Rooms with walls out of square are very common, especially in older Greek construction. A mitre box produces a fixed 45° cut, which only works for a true 90° corner. If your internal angle is wider or narrower, measure it with an angle finder and halve the reading — that is the cut angle you need. A mitre saw with a adjustable fence makes this easy; alternatively, cut to 45°, test-fit, and use a block plane or coarse sandpaper to adjust the angle by hand until the joint closes neatly.