Establish the actual opening locations from durable control points on each floor before fabricating offsets or forcing the riser. Determine whether the error is in the openings, sleeves, layout, or current route.
I measured the riser openings from the same grid lines on three floors, and the middle opening is shifted. Can we verify whether the opening, sleeve, or duct route is being corrected before I release an offset?
Watch out
Do not chain measurements floor to floor, enlarge an opening, or field-build a riser offset without approval.
Check
Measure each opening from the same column lines or building controls.
Record floor elevation and opening size.
Check the latest structural and mechanical drawings.
Photograph the vertical relationship and identify framing or rated-assembly limits.
Steps
Measure each opening from the same column lines or building controls.
Record floor elevation and opening size.
Check the latest structural and mechanical drawings.
Photograph the vertical relationship and identify framing or rated-assembly limits.
Say this to your foreman
I measured the riser openings from the same grid lines on three floors, and the middle opening is shifted. Can we verify whether the opening, sleeve, or duct route is being corrected before I release an offset?