Large Paver Patio Project in Upstate NY: Expert Answers to Key Questions

An experienced DIYer in Rochester, NY plans a 900 sq ft paver patio with curved Allan Block walls (3 ft high, 4 ft pillars). They ask six detailed questions.

1) 3-foot Allan Block walls are fine with heavy blocks (60-80 lbs); geogrid needed only if >3 ft or significant surcharge (e.g., nearby house foundation). 2) Build wall first, then cut patio to fit. Wall footing must extend below frost depth; consult local engineer for poured concrete vs. compacted gravel footing. 3) Excavate wall footing first, build wall, then patio. Can excavate all at once if equipment allows. 4) Base depth: check local vendor; 4-6 inches typical for pedestrian use, more for frost. 5) Screed in 8-foot swaths using 1-inch pipes and a 2x6; check level each pass. 6) Pergola posts: set 24-inch deep, 12-inch wide concrete footings with rebar, 2 inches below paver surface; use Simpson Strong-Tie post bases. Set posts first, leave long, trim after patio.