Q: During a recent ICF pour, I received some “bad” concrete that caused defects such as voids that I found after removing the window bucks. Are there any special guidelines to follow when pouring an ICF foundation?

A: Rick Arnold, author of and a frequent presenter at JLC Live, responds: The typical concrete mix for a foundation wall includes 3/4-inch aggregate. But when you’re working with ICFs, it’s better to order the concrete with 1/4-inch aggregate, also referred to as “pea stone.” It is the same size aggregate usually used for flat work. ICFs...

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