FireproofingCare & maintenance · Planning guide
A gap around a fire door needs the right specialist review
Do not assume firestop products are interchangeable with opening-protective repairs.
This guide helps you prepare a professional conversation. It does not specify a rated system, product thickness or installation method.
Different assemblies have different boundaries
Hilti’s current guidance distinguishes firestop systems from fire-door and fire-window assemblies. It states that its fire-protection team does not issue engineering judgments or technical evaluations using firestop systems to address those gaps unless a recognized pathway is established. That is a concrete reason not to treat every visible gap as the same repair problem.
Describe the concern accurately
Tell the building manager which door or window is affected, what was observed and whether recent work changed the surrounding construction. Provide existing assembly records and photographs from safe accessible positions. Ask the responsible professional to identify the appropriate door, frame, wall or other specialist review. Do not pack, trim, fill or adjust a life-safety assembly based on a general internet article.
Ask for the accepted repair basis
A proposal should identify the affected assembly, the evidence supporting the repair and the person responsible for review. Ask what inspection or acceptance closes the issue and where the final record will live. Avoid confusing a neat appearance with restored performance. This planning article does not diagnose a particular gap or provide permissible dimensions. Door condition and emergency use concerns should follow the building’s established reporting and safety procedures.
Avoid a cosmetic closure
An owner may receive a maintenance ticket that says only “gap filled.” Ask for the accepted repair basis and the closeout record before treating the concern as resolved. If several subcontractors worked around the opening, identify who coordinated the final assembly review. Keep the actual product and work records where the building manager can retrieve them. The goal is to make responsibility and evidence clear, not to prescribe a filler or an adjustment. If the building’s responsible person identifies an urgent condition, follow that direction promptly through the established safety process.
Primary sources & further reading
Published November 11, 2026 · Fireproofing.tv editorial desk