Since its invention more than 30 years ago, insulating concrete form construction has developed and evolved into one of the most versatile wall building systems available.
Most ICFs come in one of two types-flat wall and waffle grid. If one removes the flat wall form from the cured concrete inside, that concrete would be a continuous thickness or flat throughout. Removing a waffle grid form would yield a concrete block that is thicker in some places and thinner in others. It would resemble a waffle.