Fiberglass as fire blocking

[Mike Lamb]

Would fiberglass stuffed around a duct penetration be an acceptable fire stop?

[Chad Fabry]

No

 

[Jim Katen]

In my area, it's been accepted. In fact, I had a city inspector suggest it to me at an inspection of my very own personal house. 

[Bill Kibbel]

Fiberglass is an approved material for fireblocking around ducts and other penetrations - as long as it's installed so that it securely remains in place. The latter is left open to interpretation.

 

 

 

[inspector57]

Depends on the building. Residential single family, yes. High rise multifamily, no.