Our windows are installed outside of the wooden wall frame. We used 9 cm angle brackets with a reinforcing rib to levitate the window frame so that it will meet up with the back of our exterior wood cladding. (9 cm = 6 cm of Gutex + 3 cm of cavity wall).
From the outside we added Pro Clima Contega Solido IQ tape to the corners of the windows to increase air tightness. To do this we first released the bottom brackets and added tape to the bottom corner of the window, we then reinstalled these brackets and did the same for both the left and right side of the window. Lastly we did the same for the top corner. By doing it like this you are overlapping the tape from bottom to the top, making sure there is no water getting in between the tape.
We finished the inside by adding ESB boards against the window frames. It was nice that we could use some leftover pieces from the wall and ceiling for this. We used the chalk and lineseed oil mix again to fill up the seams on the edges of these corners.
