File:Silicone joint penetrants.jpg

Summary
Head-of-Wall Firestop Joint: Presence of penetrants demonstrate the need to have both operational and fire-tested compatibility between the joint sealant and mechanical/electrical through penetrations. In other words, it is easier to insist on the use of joint firestops that can also be used for penetration seals, as otherwise penetrants may be run by mechanical and electrical subtrades that unintentionally void the fire-resistance rating of the wall, which jeopardises the entire fire safety plan in place for a building.