We are in the process of revising our planning. We want to reduce the height of a window and move it a bit further down. Now our house manufacturer has said that we should only make the changes in a 12.5cm grid. So for both the window size and the shift. Does anyone know why this is? Are the bricks in the dimension and it should not be cut or how could it be explained?
Almost exactly the right guess. The grid of one eighth of a meter is actually derived from stone measures. Today's brick measurements still build on that, but in earlier decades with solid bricks, a brick was actually (with joint) one brick (25 cm) long and one head (12.5 cm wide). In height, this is eaten a little less hot since the use of jumbo formats, which practically create three old layers in one step.