We have installed exterior blinds with boxes in the window opening on most windows. Now the outside boxes for the louvers are not deep enough and are almost 20 cm from the inside wall. Now the plasterer has to plaster this.
The plasterer, on the other hand, said that the outer blind box should be doubled by 20 cm, so that it is more or less flush with the wall on the inside.
Now we are faced with the choice of doubling the lintels in the window openings by 20 cm with XPS or plastering the receding exterior boxes at no cost.
In my opinion, is this wrong, or should the exterior boxes for the shutters have been ordered with more depth so they are flush with the wall on the inside and ready to be plastered.....or?
Any ideas for another (cheaper) replacement? I have a hard time imagining it finished with 20 cm of plastered interior surface left over the window.
In our construction, 2 windows (bedroom and upstairs bathroom) were also ordered with such roller blind boxes (normal roller blinds – no Venetian blinds) and we also had a crack inside. The window manufacturer had first said that the correct roller blind boxes could not be ordered for the two windows due to the window dimensions. The protrusion was then plastered. However, that just looked wrong. Our GC then also said that this could not remain so. Thereupon, the window manufacturer has properly insulated and clad the projection and then the flush plastered.
In our case the external venetian blind box is flush with the inner and outer walls. To the inside is a powerful insulation block of polystyrene, integrated in the box. We have Beck+Heun boxes.