Before starting the renovation should be calculated, how much paint you need to buy.
It depends on the size of the surface to be painted and the number of layers, which we have to put. This is determined by the type of surface, its porosity, as well as the possible color, which we want to cover.
Paints intended for home renovation are usually sold in packages 500 ml, 1 l,2,5 l,5 l i 10 l . Always buy enough paint and check the batch number on the package, to be sure, that all packages come from one blend.
It is important, because the color may be a little different in different series.
Calculation of the quantity
To cover the entire surface smooth, even layer, follow the instructions on the can. In general, it can be assumed, that one liter of paint covers the following area:
Plain ground 10-12 m,
Undercoat paint 15 m,
Glossy enamel 15 m,
Farba emulsyjna 10-14 m,
Strongly covering emulsion paint 8 m,
How much paint?
To assess the surface of the walls to be painted, you need to measure the perimeter of the room (or add the length of the longer face to the shorter face and multiply by two, if the room is a rectangle with no niches) and multiply the dimension by the height of the walls. By multiplying the length of the longer and shorter faces, and we will get the ceiling area. Having added the surfaces of the walls to the surface of the ceiling, we will find out, how many square meters does the room have.
To calculate the amount of paint needed to paint the windows, we multiply the length of the entire frame by its height and treat it as a flat surface.
We make the same calculation for balcony windows, but divide the result by two. For metal windows – we take it away 25 percent. When we are dealing with smooth doors, we multiply their height by the width and add 10 percent on the edges. For paneled doors we add 26 percent. Once we know the door surface, we can calculate, how much paint to buy, by dividing the result by the paint yield indicated on the package.
How many layers of paint?
The number of applied layers of paint depends on the color of the substrate (if there was any), type of surface (its porosity and condition) and paint quality, which we use. We're gonna need more paint, if you want to paint the dark surface light. Textured or porous surfaces, such as freshly plastered walls, require the use of more paint, so double the consumption value suggested on the label or thin the first layer considerably. It is better to apply two or three thin layers of paint than one thick layer, which can cause bulges and watermarks.
If, despite these calculations, we run out of paint, let's try to paint the surface to a corner or other similar place, yes, that one whole surface is finished. Do not continue painting from the center of the wall or ceiling, as there may be a visible trace between the previously painted surface.