You need Denver concrete pros who engineer for freeze–thaw, UV, and hail. We mandate 4,500–5,000 psi, air‑entrained mixes (w/c ≤0.45), #4 rebar at 18 inches o.c., Class 6 bases compacted to 95% Proctor, and saw https://alberttmzr368034.blogkoo.com/reliable-concrete-company-denver-co-57741465