Head-of-wall firestop: compare the deck, track and movement
A tower’s corridor board reaches the fluted deck before the joint package is reviewed. The drywall foreman says the deflection track covers movement; the firestop foreman plans to spray the exposed top. The coordinator needs a complete joint comparison rather than two separate assumptions.
Compare the whole head-of-wall arrangement before framing and protection make its details difficult to inspect. Identify the upper assembly, deck profile and direction, wall construction, track, installed gap and required movement. A deflection track and a firestop product do not automatically form a matching joint system. Obtain the complete reviewed configuration and coordinate its actual construction and verification.
Coordinate the moving interface as one assembly
- Identify both assemblies and their intersection. Link the rated wall and actual floor or roof construction. Record whether the wall meets a valley, crosses flutes or runs beneath a flute, and identify relevant covering. Do not use a flat-soffit comparison for a visibly different deck simply because the wall type is unchanged.
- Compare track, board and associated components. Use current field information and the complete proposed joint drawing. RectorSeal’s public HW-D-0060 example separates configurations for different deck relationships and includes framing, board, packing and fill conditions. It illustrates why adding a familiar surface treatment does not resolve an unmatched framing arrangement.
- Obtain the actual movement comparison. Have the responsible design and technical people confirm the required movement and how the proposed configuration accommodates it. Read installed-width and movement conditions together. Do not select a gap from memory, assume every percentage describes both directions or treat a track’s name as the joint’s verified capability.
- Coordinate the order and access. Agree which trade installs and checks each component and what must remain visible. Resolve fireproofing, deck treatment and ceiling interfaces through their actual requirements. Do not fasten, trim board or remove material to create movement without the appropriate reviewed direction and safe work arrangements.
- Record exceptions and required release. Mark the located joint segment, accepted reference, observed stages and remaining actions. Keep an unmatched deck profile or missing check pending with an owner. Confirm actual verification and any closing conditions before ceilings or finishes conceal the interface; a continuous colour strip is not a complete acceptance record.
Common mistakes
- Treating the deflection track as the complete joint system.
- Ignoring the deck profile or wall direction.
- Copying a movement percentage without its installed-width conditions.
- Using a coloured surface strip as proof of concealed details.
Checklist
Complete the head-of-wall comparison
- Actual assemblies, profile and intersection.
- Track, board and complete component configuration.
- Reviewed movement and installed-width conditions.
- Owned sequence, safe access and stage checks.
- Located exceptions and actual closing release.
Check your understanding
The wall type is unchanged, but it now runs under a deck flute. Can the earlier joint release simply be copied?
