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Technical Guidance
Deflection head strips are used within partition wall systems to accommodate structural movement above the wall without transferring load directly onto the partition below. They form an important part of many dry lining and internal partition installations, particularly within larger commercial buildings where structural movement must be considered.
Correct specification and installation help maintain partition performance while allowing the building structure to move independently.
A deflection head strip is a formed metal profile installed at the top of a partition wall beneath the structural soffit.
Its purpose is to create a controlled movement zone between the partition and the structure above. This allows the soffit or floor slab to deflect under load without damaging the partition system.
They are commonly used within:
Buildings naturally move over time due to factors such as:
Without movement allowance, partitions can crack, deform or fail where they meet the soffit.
Deflection head systems help absorb this movement while maintaining the integrity of the wall below.
The deflection head strip creates a movement gap at the top of the partition. The studs within the partition are typically designed to remain free to move within the head track, allowing vertical deflection to occur without placing stress on the wall.
The amount of movement allowance required will depend on:
Deflection head strips are commonly used in:
Large-span structures often require movement accommodation above internal partitions.
Used within compartment walls and internal layouts where structural movement must be managed.
Movement must often be accommodated without compromising fire performance.
Particularly where floor slab deflection may occur.
Where deflection head strips are used within fire-rated partitions, compatibility with the tested wall system is essential.
This may include:
Performance should always be confirmed through tested system documentation and manufacturer guidance.
Correct installation is essential to ensure movement can occur as intended.
Key considerations include:
Incorrect installation can restrict movement and affect overall partition performance.
FGF manufactures deflection head strips in-house using controlled fabrication processes and precision equipment.
This allows:
Manufactured components can also help improve installation efficiency on larger projects.
Deflection head strips are an important part of modern partition construction, helping accommodate structural movement while maintaining wall performance and system integrity.
Correct specification, fabrication and installation are essential to ensure reliable long-term performance.
FGF manufactures deflection head strips alongside fabricated partition and fire protection components, supported by technical guidance and nationwide delivery.
Talk to our team about your project requirements.