I am renovating my resale flat, using granite as the floor tiles. My contractor is telling me that the tiles are not squarish enough to have small grout. I am expected to see grouts of up to 5 mm which I read that for granite tiles, the grout is supposed to be abt 2mm. Initially, he suggested to cut the tiles but he didn't do so. Instead he sourced for another batch of tiles which turned out to be the same. I need advices. If I accept the 5 mm grout, will there be any problems due to it in the finished product?