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greenblock insulated concrete formsgreenblock icf's have been used in thousands of structures across north america over the past two decades. with a proven track record and a history of exceptional design, quality and service, today's greenblock is bigger and better than ever. insulated concrete form construction is the perfect choice for residential and commercial builders who want to get a step up on their competition. icf structures are not only strong and durable, but extremely energy efficient, clean, quiet and comfortable.