TinnerFlow™3rd YearAnchors / Post-Tension SlabsRED · Stop and get direction
Do not drill a marked no-drill post-tension slab. Stop the hanger layout and use approved structural direction, GPR, or an engineered alternate support path.
A post-tension no-drill zone is not a normal hanger layout problem. It means the structure may contain stressed cables that cannot be nicked, cut, or guessed around.
Hold the drill, mark the location, and bring the foreman the bay, hanger load, and conflict. The likely recovery is a GPR-scanned anchor path, a shifted approved support point, beam/column attachment, or an engineered bridging strut/header system.
Do not drill blindly into a post-tension no-drill zone or “test” the slab with a hammer drill.
A damaged post-tension cable can create major structural danger, job shutdown, repair cost, and serious injury risk.
Final direction still comes from approved drawings, specs, manufacturer instructions, employer policy, foreman/detailer direction, structural/seismic details, and AHJ/code requirements.