You'll need Denver concrete specialists who engineer for freeze–thaw, UV, and hail. We specify 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% https://amiewfec354283.ampblogs.com/professional-concrete-contractors-denver-75175542