Do not use mastic to make standard spiral pipe into grease duct.
Check
Confirm whether the line is true grease/kitchen exhaust or another exhaust type.
Look for leakage at lockseam, joints, and fittings.
Check drawings/spec/material schedule.
Document any contaminated dripping or food-area exposure.
Hold for foreman/detailer/AHJ direction before operating or covering.
Steps
Confirm whether the line is true grease/kitchen exhaust or another exhaust type.
Look for leakage at lockseam, joints, and fittings.
Check drawings/spec/material schedule.
Document any contaminated dripping or food-area exposure.
Hold for foreman/detailer/AHJ direction before operating or covering.
Say this to your foreman
This kitchen/dishwasher exhaust at [location] appears to be standard spiral lockseam and is leaking liquid/grease. I stopped work. Do you want this held for the approved grease-exhaust material/detail?