Thanks to everyone with the suggestions. Now I know what to do.
One thing I want to explain - some of you asked that question:
My table is 1 m x 2 m. If you play "Enemy at the Gates" or Guderian's Blitzkrieg" (both by MMP / The Gamers) the maps fit the table with slightly going over the side.
By putting two sheets not on top of one another but side by side (1 sheet 1.2 x 1.2 + 1 sheet 1.2 + 1.2) I receive a gaming table the size of 1.2 x 2.4 m. This should be enough. Only the monster games you never play with maps where you can plaster your walls with will not fit (and not be played).
Sorry, English is not my native language. Hope this explains everything.
Thanks again for your help. I love this web-side and the gamers.