FireproofingRenovation · Planning guide
When a firestop condition does not match a tested detail
Understand the review path without turning a site-specific judgment into a universal solution.
This guide helps you prepare a professional conversation. It does not specify a rated system, product thickness or installation method.
Escalate the mismatch
Hilti’s engineering-judgment guidance provides a route for submitting site conditions, drawings and photographs to its fire-protection team. Its educational material describes judgments as specific to the conditions evaluated and favours tested systems where available. An engineering judgment should not be presented as a generic product approval or copied from an unrelated building.
Ask what information is missing
If the contractor reports that the site differs from the proposed detail, ask the project team to document the actual condition and identify the technical reviewer. Request a clear hold-and-resolution process for the affected work. Owners should avoid pressure to improvise a sealant combination simply to keep the programme moving. Other unaffected work can be discussed separately with the project manager.
Keep acceptance separate from issuance
Ask who must review or accept the proposed resolution for the project and whether authority involvement is required. Record the final drawing, its limitations, the locations covered and any inspection requirements. Retain the accepted revision rather than a preliminary email or an unanswered request. Manufacturer technical advice is valuable evidence, but the responsible project team must determine the appropriate approval route. This page does not issue a judgment or decide that a particular deviation is acceptable.
Track the unresolved condition by location
Give the discrepancy a location reference and an issue number, and connect it to the project’s question-and-response log. Ask for a status such as information requested, technical review underway, submitted for acceptance or closed. A request that has been sent is not necessarily an accepted solution. At handover, verify that the final record identifies which locations the resolution covers. If a similar condition appears elsewhere, refer it for review rather than assuming the first judgment applies automatically. This keeps administrative tracking from becoming accidental technical authorization.
Primary sources & further reading
- Hilti: Firestop Engineering Judgments
- Hilti: Importance of Right Specification for Firestopping System
Published November 11, 2026 · Fireproofing.tv editorial desk