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Expantion Joint
 
 
In building construction, an expansion joint is a mid-structure separation designed to relieve stress on building materials caused by building movement induced by:
• thermal expansion and contraction caused by temperature changes
• sway caused by wind
• seismic events
• static load deflection
• live load deflection

Because the joint bisects the entire structure, it marks a gap through all building assemblies–walls; decks; plazas or split-slab concourses; foundation floors and walls; roofs, planters, and green roofs; fire-rated demising walls and floors; interior floors; etc.  This gap must be filled to restore the waterproofing, fire proofing, sound proofing, air barrier, roof membrane, trafficable surface and other functions of the building elements it bisects.

Expansion joint systems are used to bridge the gap and restore building assembly functions while accommodating expected movements.

The term “movement joint” has been widely adopted in preference to “expansion joint” as it more appropriately encompasses the fact that building movement results in both compression and expansion of the material installed.

For example, when a structure heats up, the building materials from which it is built expand.  This causes the “expansion joint” to close down, thereby compressing the expansion joint system installed in the gap.
 
• Expansion joint end points at same level.
• Expansion joint to be parallel to each other.
• Allowed deviation in width say for e.g. 50mm gap is 3-4 mm.
• Maximum width treatable with the standard method is 50 mm as the sealant by self weight will tend to sag.
• The floor expansion joint will be subject to vehicular traffic so proper metal plate (SS 304/307) protection is required to protect the joint being ripped open by vehicular traffic.
 
Treatment Stage -1
• Cleaning of Joint
• Checking for even finish.
• Application of Water base Adhesive to side wall
• Insertion Of Backer Rod to required depth (Supreme plastics 60 mm to size or dia or equivalent as per site conditions.)
• Application of Waterproof elastomeric Sealant (Pour or gun grade)
• Allow to cure and protect from water damage.
• Application of protection skin(Client scope)
 
Expansion Joint Stage-1
 
Expansion Joint Stage-II
 
 
   
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