Tell the other trade you need a short hold while you call your foreman.
Contact foreman with room/grid/system and what is at risk.
Do not argue; document and escalate.
Ask foreman
The ceiling/grid crew is about to cover [damper/access/seal/inspection item]. Can we hold this section for a few minutes while I verify with my foreman?
Do not
Do not let critical access disappear because you felt awkward speaking up.
Why it matters
Once ceiling or wall closes, a small coordination miss turns into demolition, missed inspection, or failed TAB.
Search words: coordination clashes rework access/inspection ceiling trade covers access inspection service access panel ceiling trade covers access inspection service access panel coordination rework What do I do when ceiling trade covers access before inspection? If another trade is about to cover your access, inspection, seal, or TAB item, hold the area calmly and call your foreman before it disappears. coordination clashes rework access/inspection ceiling trade covers access inspection service access panel