# Tikkurila Optiva Semi Matt [20]

Emulsion paint · Tikkurila

Tikkurila Optiva Semi Matt [20] covers 8 to 16 m² a litre and takes 2 coats, by Tikkurila's own figures.
Source: Tikkurila, Tikkurila Optiva Semi Matt [20] product data sheet, read 12 October 2026.

The walls of a 3 × 4 m room, 2.4 m high, need 8.462 L: 1 × 9 L to buy. At 10 m² a litre, BuildBatch's generic example for a wall that is not the maker's best case, the same room needs 6.77 L: 3 × 2.7 L.

## Coverage

Tikkurila states 8 to 16 m² a litre. The maker's words: “8-16 m²/l max. with one coat”.
- Bare, rough or absorbent surfaces: A maker's coverage is their best case, on a smooth sealed surface: bare, rough or absorbent walls take more.
- A strong change of colour: Tikkurila says: “For colours of particularly weak hiding power (marked within the tinting system) it may be necessary to apply additional coats”. Each extra coat is the paint of one coat again.
- A range, not one figure: Tikkurila gives a range. The room table uses the lower figure, 8 m² a litre, so that the answer errs towards enough paint.
- Waste and touch-ups: The room table adds 10% for what stays in the tray and on the roller and for touching up: BuildBatch's generic example, not the maker's. The tin-by-tin figures add nothing.
- The ceiling and the woodwork: Neither is in these figures. Each is a separate paint and a separate line on a list.

## Coats

Tikkurila gives 2 coats for Tikkurila Optiva Semi Matt [20], in these words: “For colours of particularly weak hiding power (marked within the tinting system) it may be necessary to apply additional coats”.

## Tin sizes

| Tin | One coat | 2 coats |
|---|---|---|
| 2.7 L | 21.6 to 43.2 m² | 10.8 to 21.6 m² |
| 9 L | 72 to 144 m² | 36 to 72 m² |

Arithmetic on the maker's figure: the litres in the tin times the coverage per litre, with nothing added for waste.

## How many tins for a room

| Room | In feet | Walls to paint | Paint needed | Tins to buy | At 10 m² a litre |
|---|---|---|---|---|---|
| 2.5 × 3 m | 8.2 × 9.8 ft | 23.57 m² | 6.482 L | 3 × 2.7 L | 2 × 2.7 L |
| 3 × 3 m | 9.8 × 9.8 ft | 25.97 m² | 7.142 L | 3 × 2.7 L | 3 × 2.7 L |
| 3 × 4 m | 9.8 × 13.1 ft | 30.77 m² | 8.462 L | 1 × 9 L | 3 × 2.7 L |
| 4 × 4 m | 13.1 × 13.1 ft | 35.57 m² | 9.782 L | 4 × 2.7 L | 3 × 2.7 L |
| 4 × 5 m | 13.1 × 16.4 ft | 40.37 m² | 11.102 L | 1 × 9 L + 1 × 2.7 L | 1 × 9 L |

Each room is 2.4 m high with one internal door and one window of 1.2 × 1.1 m taken off; 2 coats; 10% extra for waste, BuildBatch's generic example. Worked out by the planner when the site was built.

Start a list for a 3 × 4 m room with this paint's figures: https://buildbatch.co.uk/start/#v=1&job=paint&walls=paint&ceiling=none&trim=none&units=m&length=4&width=3&height=2.4&door=0.762x1.981&window=1.2x1.1&surface=sound&subfloor=unsure&ground=unsure&fitting=unsure&wallpaint=custom&wallpaint.coats=2&wallpaint.coverage=8&wallpaint.extra=10&wallpaint.tins=2.7,9&wallpaint.examples=extra&end=21

## Where to buy it

The page has the shops' own searches for it, and any link there that is paid for is marked Ad: https://buildbatch.co.uk/products/tikkurila-optiva-semi-matt-20/#where-to-buy. BuildBatch sells nothing and compares no prices.

## Questions

**How much does a litre of Tikkurila Optiva Semi Matt [20] cover?** Tikkurila states 8 to 16 m² a litre for Tikkurila Optiva Semi Matt [20] (Tikkurila Optiva Semi Matt [20] product data sheet, read 12 October 2026). A maker's coverage is their best case, on a smooth sealed surface.

**How much does a 9 litre tin of Tikkurila Optiva Semi Matt [20] cover?** At the maker's figure a 9 L tin covers 72 to 144 m² in one coat, or 36 to 72 m² in 2 coats. That is the litres times the coverage per litre, with nothing added for waste.

**How many coats does Tikkurila Optiva Semi Matt [20] need?** Tikkurila gives 2 coats for Tikkurila Optiva Semi Matt [20], in these words: “For colours of particularly weak hiding power (marked within the tinting system) it may be necessary to apply additional coats”.

**How many tins of Tikkurila Optiva Semi Matt [20] for a 3 × 4 m room?** The walls of a 3 × 4 m room, 2.4 m high, need 8.462 L: 1 × 9 L to buy. At 10 m² a litre, BuildBatch's generic example for a wall that is not the maker's best case, the same room needs 6.77 L: 3 × 2.7 L. The room is 2.4 m high with one door and one window taken off, 2 coats, with 10% extra for waste.

**What tin sizes does Tikkurila Optiva Semi Matt [20] come in?** The catalogue lists 2.7 L and 9 L. A shop may not stock every size.

## Where the figures come from

- Tikkurila, Tikkurila Optiva Semi Matt [20] product data sheet (https://www.tikkurila.co.uk/amfile/file/download/file/9851/product/2074/): coverage and coats, read 12 October 2026.

Written with AI tools; not yet checked by a tradesperson. Follow the tin's own instructions.

The page: https://buildbatch.co.uk/products/tikkurila-optiva-semi-matt-20/