Bottom-of-wall firestop joints: verify the gap before finishes cover it
The student-residence flooring crew is ready to fit base at the corridor. The firestop register tracks wall heads and service openings but has no entries for the wall bottoms. The superintendent needs an actual requirement review before calling the corridor complete.
Bring the wall base into the review before finishes conceal it. Confirm where the drawings and complete assembly details require protection, rather than assuming every floor-track junction uses the same seal. RectorSeal BW-S-0014 illustrates a specific floor and gypsum-wall construction with board-edge gap and fill conditions. It is an example to compare, not a universal base detail or evidence that a head-of-wall system also fits below.
Add wall bases to the pre-cover sequence
- Locate the required wall-base conditions. Link wall types, floor assemblies and applicable detail references to plan segments. Include changes of construction, door interfaces and inaccessible areas where relevant. Ask the responsible reviewer to settle omissions or uncertain applicability. A rated corridor label alone does not identify the exact construction or verify every wall-base requirement.
- Compare what is actually built. Record board edges, runner and floor condition, gap variation and available access through safe permitted inspection. Match the complete reviewed configuration and its named products or components. Refer departures to the qualified process. Do not add a generic bead, pack an unknown void or copy a head-joint arrangement to make the line look finished.
- Coordinate protection with floor finishes. Tell flooring, wall and firestop foremen what must remain exposed, who completes each component and when the check is due. Include floor preparation or base fixing that could alter the accepted arrangement. Where access has already been lost, obtain an assessed investigation and reinstatement plan; absence of a visible gap is not verification of concealed work.
- Release only the checked boundary. Record the required evidence, inspection outcome and actual location before base or flooring conceals it. Keep exceptions with owners and dates, and notify the receiving finish trade of the exact released section. Later modifications need a recorded review route rather than an assumption that the finished floor makes the wall-base condition permanent.
Common mistakes
- Tracking wall heads while omitting the specified bases.
- Treating flooring or base trim as the protection system.
- Copying a detail from another joint location.
- Closing the register from finished appearance alone.
Checklist
Before the base goes on, record
- Required wall-base locations and actual assemblies.
- The complete accepted protection arrangement.
- Access, construction and floor-finish interfaces.
- Required checks and located releases.
- An owned response for hidden or changed conditions.
Check your understanding
Base trim already covers an unverified required wall-base joint. Can a finished-corridor photograph close the item?
