TinnerFlow™3rd YearMeasuring / LayoutYELLOW · Check First
Do not force a heavy riser sideways to hit the next opening. Stabilize what is installed, verify shaft openings, and use an approved offset, transition, or support correction.
A vertical riser that leans a few inches inside a shaft can turn into a major alignment problem after the next floor. Forcing it can tear joints, rack flanges, overload supports, or wedge the duct against concrete.
Check the riser support points, slab openings, plumb line, field dimensions, and whether the drift is from layout, fabrication, or support movement. Likely recovery options include re-setting support, adding riser support, shifting the next section, or using an approved offset/transition inside the shaft.
Use this as training guidance. The foreman, approved drawings, project specs, manufacturer installation instructions, employer safety policy, and AHJ/code requirements always control the final answer.