How does the OP work out if the 0.2 of the tile is the top left or right of the tile?
I'm sure you meant 11 tiles
But I make this mistake often - don't work the roof out on purely m2 - you will always need more tiles.
Despite what the manufactures say, there are always more tiles to cover a m2, as often the nett area of 1 tile may in reality mean 4 tiles cut into 75mm wide pieces.
If there are any cuts or the guage is adjusted, then its very easy to be at least 10% out from the total based on m2.
Either add 12%, or work it out based on how many tiles wide, by how many rows high
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