Key residential workmanship references: NAHB Residential Construction Performance Guidelines (most widely referenced standard, covering tolerances for framing, drywall, flooring, concrete, and painting); ACI 117 for concrete flatness tolerances (3/8″ maximum gap under a 10-foot straightedge); ASTM C840 and Gypsum Association GA-216 for drywall installation — Level 4 finish is the standard for painted surfaces with eggshell or satin paint; Level 5 finish (skim coat or extra drywall compound application) is required for flat or matte paint and critical lighting conditions; NWFA Installation Guidelines for wood flooring; TCNA Handbook for tile installation; and AWI Quality Standards (Premium, Custom, or Economy) for architectural millwork. RainFire Builders specifies the applicable workmanship standard for each trade scope on each project and applies that standard at phase sign-off and final punch list.