ParedeCerta.ptPT
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How much paint does the room take?

Room
4.5 m
3.5 m
2.60 m
Windows
1
Doors
1
Coats
2
Colour
What do you see on the wall?

Paint

11.0 L

54.3 m², 2 coats, at 10.0 m² per litre

Tin

3 × 5 L

It is on the tin or the data sheet. 10 is only an example.
Walls
38.6 m²
Ceiling
15.8 m²
Area to paint
54.3 m²
Room elevationSizes in metres · approximate drawing
4.5 m3.5 m2.60 m+2.60±0,00abc
  • a walls
  • b cold corner
  • c ceiling
  • Window 1.2 × 1.2 m and door 0.8 × 2.0 m: typical sizes, for an estimate.

Wall form

ParedeCerta.pt

Sent with the formLiving room · 54.3 m² · 11 L · Sage

The room you drew goes with the form.

Free. No commitment.

How it works

  1. Measure the room

    Rough sizes, windows and doors. You see the area and the litres of paint at once.

  2. Say what you see on the wall

    Damp, mould or white powder change the job. We explain what comes before the paint.

  3. Send the form

    With the area and the problem in hand, a quote per square metre reads in seconds. We do no building work.

Before painting, the cause.

New paint on a damp wall does not last. Mark what you see on the wall in the calculator and learn what to fix first.

Mark what I see on the wall

Why paint peels

New paint on a damp wall does not last: water pushes from behind, the paint blisters and falls. First find out where the water comes from.

  • a
    InfiltrationWater getting in from outside: façade, roof, window frame.
  • b
    CondensationHumid indoor air meeting a cold wall. It brings mould to the corners.
  • c
    Rising dampGround water rising through the wall. It leaves salt near the floor.
abc
Section of an outer wallStreet · Wall · Room

Everyday walls

Each room asks for its own paint and care. These are reference illustrations, not our work.

  • Living room
    Living roomWashable matt paint on the walls people touch most.
  • Bathroom
    BathroomSteam every day: ventilate before choosing the paint.
  • Bedroom
    BedroomWhere mould shows first, behind the furniture.
  • Façade
    FaçadeOutside, the condominium and sometimes the council decide.
  • Colours
    ColoursSee the colour on the wall, in the room’s own light.
  • Preparation
    PreparationProtect, sand and clean before opening the tin.
  • Finish
    FinishA smooth wall starts in the plaster, not the paint.

Portugal’s homes in numbers

Most of the country’s buildings predate 2001. Older homes more often have cold, damp walls. Figures from INE’s 2021 Census, for the whole country.

3,573,416
buildings counted in 2021
23.1%
built before 1961
82.1%
built up to 2000
4.6%
with deep repair needs

Source: INE, 2021 Census, indicator 0011482 (sum of the 308 municipalities). CC BY licence. These are whole buildings: age is a hint, not a diagnosis.

Where what we write comes from

Every number has who published it and the date we read it. What we could not confirm, we say.

Diário da República
Laws: Civil Code (condominium, renting, damage), VAT, permits.
LNEC
Technical publications on damp in buildings.
DGS and SNS 24
Indoor mould and health.
ADENE
Ventilation and energy certificates.
Municipalities
Local rules for painting façades.
Paint makers
Data sheets, always with the date.

Free. No commitment.

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