Today the first window was changed.... Removing the old one a hollow area above the window was discovered I am just wondering if somebody experienced something similar... And why it is hollow... Any Idea?
OK.. So I put rockwool bags inside the hole and the window builder can install the rollershutters now... I am curious to see how he centers the window and the rollershutters as the distance from each vertical bar of the WI dow has a different gap to the frame...