Fabrication of PVC-U windows and doors is different from fabrication of aluminium windows and doors. A big difference is that instead of mechanically joined at corners for aluminium frames, PVC-U frames are fusion welded at corners.
Following video about PVC-U window manufacturing process is from our Premium Series profile supplier – VEKA in Germany. Manufacturing process in our Auckland factory is similar. One major difference is that we fit timber reveal liners onto the window frames as standard but PVC-U windows in Europe do not have reveal liners.