The problem is that the width at one end of the room is 290 cm while at the other end of the room is 295 cm so i assume that the walls are not straight.
Draw straight line on the floor.
If the bubble goes to the center of the level between the 2 black lines your line is straight.
Hi all i have to draw a straight line on a floor before i put tiles.
Use a bubble level as you go to make sure the lines you re drawing are perfectly straight.
If you re trying to paint along the line where your walls and ceiling meet you can skip this step.
Pull the line very taut and the hold the line down on the mark with one hand.
When any project calls for drawing a long straight line on a floor wall or similar flat surface a professional mechanic will use a chalk line.
Place the level along the line.
Hardwood floor in.
Snap the chalk line leaving a straight chalk mark on the subfloor.
A chalk line can be as long as needed being.