That's right. The other day I drove by a house that's currently undergoing renovation, but the guy who owns the house does everything himself in a jack-of-all-trades kind of manner. He had put on a nice thick layer of insulation on the outside, but the sheets/blocks were apparently too short in some parts or simply fitted poorly, and in other areas I saw that he had just used some left-over cut-offs of various shapes and sizes in what looked almost like a mosaic. To make everything stick and fit, tons of sprayfoam has been used in an attempt to fill the inevitable large gaps (1 inch) between the blocks.

I kinda feel sorry for the guy, investing all the hard work and having good intentions, but due to poor workman ship he cannot expect to get the insulating effects he's surely hoping for.