Customer focused services
Firestopping restores the fire-resistance rating of a wall or floor wherever pipes, ducts, conduit, and cable pass through it, using tested and listed systems — sealants, wraps, collars, pillows, and devices installed exactly per the UL or Intertek listing. K. Guller Insulation installs and documents penetration firestop systems on commercial projects across Pennsylvania, New Jersey, and Delaware, typically as part of a combined insulation-and-firestopping scope.
Every hole cut through a fire-rated wall or floor is a breach in the building’s compartmentation — the design that keeps a fire in one zone long enough for people to get out and crews to respond. Firestopping seals each penetration with a system tested to ASTM E814 / UL 1479, restoring the assembly’s F-rating (flame) and, where required, T-rating (temperature rise). The key word is system: a listed combination of the specific wall type, penetrating item, annular space, and firestop products. Substituting any element voids the listing — which is why installation discipline matters more than the tube of red sealant.
Steel and copper, including insulated penetrations where the insulation runs continuous through the assembly per the listing
Intumescent collars and wraps
Sealed per listing; coordinated with damper requirements
Including re-enterable pillow and device systems for pathways that change
Abandoned or future-use penetrations
Because we’re the insulation contractor, we firestop insulated penetrations correctly the first time — the single most commonly failed detail in third-party inspections, since the listing depends on whether insulation continues through the wall.
Every penetration gets the listed system number, and the project gets a firestop log — system, location, installer, date — with labeling at each penetration where specified.
That documentation package is what gets you through special inspection (IBC Chapter 17 requires special inspection of firestopping on high-rise and certain occupancies), the AHJ walk, and — in hospitals — ongoing Joint Commission barrier-management surveys.
Because the gap between trades is where ratings die. On most jobs the plumber, the tinner, and the electrician each make holes; nobody owns sealing them; and the punch list finds a hundred open penetrations at closeout. Carrying firestopping with the insulation scope means the contractor already working every pipe and duct run seals the penetrations as the work progresses — one sub, one log, no orphaned holes.
Find answers to common questions about our services, processes, and how we work with clients across various industries.
Firestopping seals penetrations and joints in fire-rated walls and floors; fireproofing (SFRM) is the coating applied to structural steel. They’re different scopes — K. Guller Insulation performs firestopping.
The F-rating is how long the system prevents flame passage; the T-rating adds a limit on temperature rise on the unexposed side. The code dictates which applies based on the penetration and location.
Yes. The listed system depends on whether the insulation is continuous through the assembly, its material, and its thickness — using a bare-pipe system on an insulated penetration voids the rating and fails inspection.
On high-rise buildings and certain occupancies, yes — IBC Chapter 17 requires special inspection of penetration firestop systems, which is why per-penetration documentation matters.
K. Guller Insulation installs and documents listed penetration firestop systems across eastern PA, NJ, and DE, usually combined with the mechanical insulation scope. Call (610) 941-9394.
