If you want to know a key thing to avoid in order to get this firestop stuff right, this will help. The piece was written for ASPE, but even if you arent a plumbing engineer, the lesson her is valuable for all MEPS trades. Check it out here and let me know what you think.https://www.aspe.org/pipeline/june-2022-lessons-in-firestop-goldilocks-the-horror-story/