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JM-BAR 50 Type
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It is ceiling system facilitating installation of fire-fighting facilities and piping as product which improved workability by correcting defects of existing wooden ceilings and improving durability and function through replacing ceiling for apartment and offices made up of wooden materials with incombustible steel material support. In particular it enables free adjustment of ceiling height.

General items for J/M-BAR SYSTEM

(1) Definition of terms

  • System: J/M-BAR SYSTEM

(2) Transportation and handling

  • ① Transportation: After recording type, name, dimension and manufacturing date etc. at label transport it.
  • ② Handling: Handle it according to manufacturer's instruction and requirement of users.


(1) Materials

  • KSD-3506 (melt galvanized steel plate)

(2) Dimension

  • a. Hanging system
  • □ Bracket (40t): for 45mm from top slab to finishing face of ceiling
  • □ Hanger bolt (Ф 6mm x 200 mm): for 140mm∼ 200 mm from top slab to finishing face of ceiling
  • □ Nut (Ф8mm)
  • b. Material for frame
  • □ Carrier (1.2T x 25mm x 12mm): wing integrated type
  • □ M-bar (0.45T x 50mm x 14 mm)
  • □ Lumber for molding (33 mm z 22 mm Oregon pine)
  • c. Supplementary metallic material
  • □ hilti pin (1/4 inch): for fixing bracket to upper slab
  • □ hilti pin (DN52) fox fixing timber for molding
  • □ metal screw (Ф 4mm x 25mm): flat head self drilling screw
  • □ insert (Ф 4 mm x 36 mm)
  • □ bolt (Ф 4mm x 32mm)
  • d. Miscellaneous
  • □ Steam dried timber with water content rate of 15% or less
  • □ Molding (PVC): specified dimension

Special feature of J/M-bar system

  • * Beautiful exterior: concealed type whereby no bar is seen.
  • * Stability of steel structure: sturdy ceiling without distortion
  • * Incombustible: steel structure by using galvanized steel plate
  • * Providing perfect structure by installing insert to slab structure
  • * Possible for adjustment of level: possible for perfect level
  • * Easy for adjust height of ceiling

(1) Setting centerline of building: After accurate measurement of ceiling surface set up centerline after checking other work schedule such as lightline and position of diffuser etc.

    (2) Strong anchor work

    • ① At the time of strong anchor work when centerline is set up mark part for fixing strong anchor (9mm) at slab surface and punch hole with drill and fix it.
    • ② At the time of work for cash iron insert (9 mm) install it at form according to drawing.
    • ③ Caution: Pay attention to intervals between anchor and insert and right angle.
    • ④ It is ideal to make interval for installation as @900∼ 1,200 mm for strong anchor or insert in consideration of direction of installation of carrying channel.

    (3) Molding line level check

    • ① Use of water level or level
    • a. Confirming position by means of drawing (confirming height of ceiling)
    • b. Confirming the position by water level and ink pot string marking between positions.
    • ② Caution: At the time of using water check make sure to check level after checking any presence of air bubble in hose and breaking of hose.

    (4) Attachment of wall molding (using after painting angle or sea gull molding)

    • ① Attach molding along the India ink line and fix wall molding by using 1" concrete nail.
    • (interval 500∼ 1,000 mm)
    • ② Be careful not to slacken the height and interval between moldings.
    • ③ In connection with facilities such as curtain box it shall be attached according to specification.

    (5) Installation of anchor bolt

    • ① Upper part of anchor bolt is fixed to strong anchor or insert and power part of bolt is fixed with hanger and nut in consideration of ceiling height at finishing.
    • ② At the place where installation duct or other obtacles are present work shall be carried out after reinforcing it according to specification.

    (6) Installation of lightline

    • Install lightline according to specification but it is required to have consultation with persons in charge of electricity and facility.

    (7) Installation of carrying channel

    • After linking hanger set and carrying channel fix it and install it with an interval of @900∼1,200 mm. The joint part of carrying channel shall be connected by using carrying joint.

    (8) Installation of minor channel

    • When area for works is broad reinforce and fix with supplementary channel (minor channel) installed above the carrying channel and install it with an interval of @2,000∼3,000 mm.

    (9) Installation of module bar

    • ① Mark centerline for work with ink pot string and install module bar sturdily by using C/T cup in a right angle direction to carrying channel according to dimension of product and lightline.
    • ② Intervals of module bar shall comply with drawings or specification.
    • ③ Module bar is raised to wall molding or curtain box wing part and installed.

    (10) Installation of Main ST' LT-bar

    • ① Install Main ST' LT-bar sturdily by using C/T cup toward right angle direction to carrying channel according to dimension of the product and lightline.
    • ② Intervals fore Main ST' LT-bar shall comply with drawing and specification.
    • ③ Main ST' LT-bar is installed by placing it to wing part of curtain box.

    (11) Installation of finishing plate (sound absorption tex)

    • ① Accurately set level of installed ceiling frame by bolt and nut through using water level or level.
    • ② Place finishing plate on module bar and T-bar then insert H-bar and then once more place finishing plate to T-bar and then insert it to H-bar and by repeating it work is finished.
    • ③ Prohibit use of finishing plate with scratch, broken corner or dirtied.

    (12) Installation of curtain box

    • ① Manufacturing and installing products suitable to use according to specification (separate painting)
    • ② Welding work is carried out concurrently therefore install work bench to enable safety in work and working in comfortable stance.
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