A typical fire problem: the measures taken by the plumbers and the drywallers are at cross-purposes.
Another set of unsealed drywall through-penetrations.
Another example: this steel sleeve, a penetrant itself, causes more problems than it solves.
Penetrants have been punched and burned through drywall, compromising its integrity.
Mechanical shaft with compromised fire-resistance rating through pipe installation.
Finished, painted, fire-resistance rated drywall assembly. A common deficiency: List ceiling tiles and find electrical and mechanical service penetrations without a firestop.
Improper drywall assembly with absent firestops at Cambrian College, Sudbury, Ontario, Canada
Improper Firestop and Fireproofing interface, August 2000, Cambrian College, Greater Sudbury, Ontario, Canada.
Improper breach of fire-resistance rated drywall assembly, August 2000, Cambrian College, Greater Sudbury, Ontario, Canada.