Produce-Mister Humidity Is Causing Nearby Duct Sweating

Fast answer

Treat the misting area as a local high-moisture condition and verify the specified insulation, vapor barrier, exposed hardware, and air leakage. Do not assume a different wrap or stainless hardware without project confirmation.

What to check

1. Confirm whether the moisture appears only during mister operation.
2. Inspect nearby collars, grilles, supports, access doors, and insulation seams.
3. Check whether the installed material matches the approved insulation and finish schedule.
4. Document recurring wet locations and any corrosion or damaged jacket.

Do not

Do not choose a new insulation system or hardware material from a generic grocery-store rule.

Ask the foreman

“This branch only sweats when the produce misters run. I checked the wrap and found exposed metal at the support plus a damaged jacket seam. Can we confirm the specified repair for this wet zone?”

Why it matters

A local moisture source can expose small insulation and vapor-barrier defects that stay dry elsewhere in the store.