We bought 4 rolls to be on the safe side but would of got away with 3, possibly 2. Have to say I wasted 2 pieces as the first one ripped and the second one the ink smudged. So ended up taking them off the wall. On the third piece I had worked out that the ink smudges and any paste marks could be removed straightaway with a damp sponge. (Every piece had ink smudges when pasted) Have to say it does look good once finished and quite realistic. Gave it 4 out of 5 due to smudging and the amount of paper wasted on each roll.