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I've built them over concrete cores, cmu/brick cores, stone facing with rubble cores, and from solid stone 8 inch slabs. Just whatever the job calls for. My opinion, the most fun are those built from stone flagging with rubble/ stabilized sand cores that run "free form" up hill sides as part of the hardscape. Just have to make sure rise and tread stay consistent and meet code. Worked on one out on lake Travis that had about a 50 foot overall rise on a cliff face. Used stone we quarried right on the site. Great summer time job.
JVC
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