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I have a situation where a wood sub floor meets concrete and the filler between the 2 keeps cracking out, any suggestions on what I should be using?

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I always use caulk between two different materials like wood and concrete. This assumes the gap is 3/8" or less. Caulk adheres well to both, and will allow the natural expansion of the wood. For a wider gap you could try expanding foam. – getterdun Feb 4 '14 at 1:11

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