How to Paint a Ceiling Without Streaks

What you need

Ceiling paint (flat/matt — gloss shows every flaw), a roller with an extension pole, a brush for cutting in, a paint tray, masking tape, dust sheets, a step ladder and good light — a work light on the floor, pointing across the ceiling, shows missed patches nothing else will.

Step 1 — Prep the room

Move furniture out or to the centre and cover it. Fill cracks and holes, sand them flat when dry, and wipe the ceiling with a damp cloth so dust does not end up in the paint. Mask the tops of the walls. A ceiling is the worst surface to paint over dust — every speck shows.

Step 2 — Work out the paint

Measure the room's length and width and enter the coverage from the tin — never assume it, because coverage varies by paint and by surface. The ceiling paint calculator gives you the litres for the number of coats you plan. Two coats are normal for a ceiling: one coat rarely covers evenly.

Step 3 — Cut in, then roll

Cut in the edges with a brush, then roll the main area in one direction, in sections, keeping a wet edge — never let a section dry before the next one joins it, or you get lap marks. Roll away from the window so the light falls along the roller marks, not across them. Let the first coat dry fully before the second.

Which paint and which roller?

Use a flat or matt ceiling paint: it hides flaws because it does not reflect light. Gloss or silk on a ceiling shows every roller mark and every bump in the plaster. For a smooth ceiling use a short-nap roller; for a textured ceiling use a longer nap so the paint reaches into the texture. A roller on an extension pole keeps you off the ladder for most of the work and gives a more even pressure than reaching overhead.

Worked example

A room 12 ft × 10 ft has a ceiling of 120 ft² (11.15 m²). Two coats at 12 m² per litre need 1.86 litres (0.49 gallons) — so buy 2 litres (1 gallon). Those are exactly the numbers the ceiling paint calculator gives you.

Common mistakes

• Rolling in different directions. Roller marks show when the direction changes. Pick one direction and keep it for the whole ceiling.
• Letting the edge dry. A dry edge next to a wet section leaves a lap line. Work in sections and keep the edge wet.
• One coat. One coat on a ceiling almost always shows patches. Two thin coats beat one thick one.

Safety

Use a stable step ladder and never overreach — move the ladder instead. Wear eye protection: paint drips from a ceiling land in eyes. Keep the room ventilated while you paint and let it dry before you sleep in it.

Try these calculators

• Ceiling Paint Calculator — litres and gallons for any ceiling and coats.
• Paint Calculator — paint for any area and number of coats.
• Wall Area Calculator — wall and ceiling area for a room.