Windsor Environmental · Updated November 2026
What it looks like
- Air-cell: corrugated, cardboard-like white or grey wrap.
- Magnesia or calcium silicate blocks: chalky, often canvas-jacketed.
- Fittings: hard, plaster-like casings on elbows, tees and valves.
If it was installed before about 1980, test it before anyone cuts, drills or removes it.
Leave it or remove it?
Intact, undisturbed insulation can be left in place and monitored. Damaged insulation, or any you’ll disturb for plumbing, heating or renovation work, should be removed or repaired by licensed crews.
How it’s removed
Short runs and fittings are often removed with glovebags: sealed bags around the pipe so fibers never reach the room. Long runs and boiler rooms are done inside full containment with negative air. Air monitoring confirms the area is clean.
Paperwork by location
- NYC: more than 25 linear feet is filed with DEP (ACP-7).
- Rest of NY State: more than 260 linear feet needs 10-day NYS DOL notification.
- New Jersey: NJ-licensed contractor, applicable permits and notifications, and clearance testing at the end.
Cost factors
Linear feet, number of fittings, pipe diameter, access (crawlspaces and risers cost more) and whether you need reinsulation afterwards.
Questions
Can I wrap damaged insulation myself?
Small repairs should be done by trained, licensed workers. DIY patching often disturbs the material.
This guide is general information, not legal advice. Rules change. We’ll confirm what applies to your property when you call.
