I am trying to decide on a concrete mixture for a decorative band which separates the different levels of the enclosure. I'll be forming one pour on top of the cinderblock, then using metal framing from the top of the band up to the top of the enclosure. Manufactured stone will be veneered to the enclosure. I made 2 test forms for the pour I want to do. The first was bagged concrete, the second was 3/4 part portland, 1 part sand, 2 parts vermiculite. The concrete one weighed 34 lbs., the other 22.5 lbs. Does anyone know if it's worth it to do the lightweight concrete given the metal framing and the upper enclosure weight will be sitting on it?
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Concrete Mixture Question