A slip track is a specific type of framing component used in non-load bearing walls or curtain walls that allows for vertical movement of the primary structure without transferring loads to the wall. Essentially, it's a channel section (typically the top track) that's fastened to the building's structure but not rigidly connected to the vertical studs of the wall.
Here's a more detailed breakdown:
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Purpose: Its primary function is to accommodate building movement. This movement can result from factors like:
- Seismic activity: Earthquakes can cause buildings to shift and sway.
- Thermal expansion and contraction: Temperature changes can cause building materials to expand and contract.
- Live load deflection: The primary structure may deflect slightly under applied live loads.
- Concrete creep: Concrete can slowly deform over time under sustained load.
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Construction:
- The slip track is usually a channel made of steel or other durable material.
- It's attached to the primary structure (e.g., concrete slab or steel beam above) using fasteners.
- The vertical studs of the wall are installed within the track, but there's a designed gap or "slip" space. This space allows the structure to move vertically relative to the wall.
- This space is usually filled with a compressible material (e.g., fire-rated sealant or mineral wool insulation) to prevent drafts, noise transmission, and the spread of fire.
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Benefits:
- Prevents damage: By allowing movement, the slip track prevents the wall from cracking or buckling due to structural forces.
- Maintains fire rating: When used with appropriate fire-stopping materials, it helps maintain the fire-resistance rating of the wall assembly.
- Reduces noise transmission: The separation between the structure and the wall can help minimize sound transfer.
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Applications:
- Curtain walls
- Interior non-load bearing walls that extend to the structure above.
- Walls in areas prone to seismic activity.
- Walls in large buildings where thermal expansion and contraction are significant.
In summary, a slip track is a crucial component in wall construction that provides a necessary buffer between the primary structure and the wall itself, accommodating movement and preventing potential damage while maintaining the integrity of the wall system.
