How to do BRICK BAT COBA at Building Terrace


                                 How to do BRICK BAT COBA
PREPARATORY WORK
  • Plaster of parapet, Mumty machine room, Water tank, Expansion joint treatment at terrace level must be completed before start of water proofing
  • Scaffolding or left out material should be removed
  • Any debris or deposit on the surface should be removed.
  • The surface must be thoroughly cleaned and free from dust, dirt loose materials, oil or grease.
  • Level should be marked on parapet minimum 600 above terrace
  • All rain water pipe is to be fixed
  • Ridge line to be marked
PROCEDURE OR METHODOLOGY:
  • Convex gola of 1:2:4cement concrete with water proofing compound shall be prepared along parapet, mumty and shaft wall.
  • Uniform layer of1:2cement slurry with water proofing compound shall be applied on terrace.
  • Uniform layer of 20mm thick 1:4 cement mortar is to be laid.
  • Brick bats shall be laid as per level on edge with 12mm gap all around.
  • Allow brick bats in cement mortar to set for 3 days and curing to be carried out for same period.
  • After three days, 1:4 cement mortar shall be filled in 12 mm gaps.
  • 20mm 1:4 cement mortar is to be spread over the brick bat
  • Concave gola is to be made all along the parapet up to 300 mm
  • After 12 hrs mason thread impression to be marked over finish surface at interval of 300 mm both ways
  • Prepare khurra at RWP location
Inspection
  • Slab should be moist before application of cement slurry
  • Level should be marked all around before the start of work
  • Impression shall be dark deep enough
  • Ponding shall be carried out for 7 days for testing.


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