Jointing & Finishing

Hilux Calcium Silicate boards are available with Tapered and Square edges. The joints of these boards can be jointed and finished by using specially formulated Jointing Compound and fiber mesh tape, to get seamless finish. The square edges of the boards can be made tapered (40x1.5mm) at site by using grinding machine or by chamfering the edges (4x3mm). The corners can also be reinforced with fiber mesh tape. The procedure is detailed below:

Tapered edge joints:

jointing-finishing-taperededgejoint
 
Step 1(First-coat)
  • Apply Jointing compound at joint

  • Firmly embed the 48mm wide self-adhesive fiber mesh tape centrally into the joint.
  • Apply jointing compound on the fiber mesh tape with tapping knife.
  • Use sufficient pressure to ensure that the tape is firmly placed.
  • The tape should be free from trapped air/bubbles and this application should be approx. 4” wide.
  • Remove extra material lying outside of the joint and allow it to dry.
Step 2(Second coat)
  • When the first coat is dried, apply second coat of jointing compound to the joint.
  • Ensure that the preceding application and tape is completely covered by making this application wider than the earlier.
  • Remove extra material and allow it to dry.
Step 3(Third coat-finishing coat)
  • When the 2nd coat is dried, apply a very thin layer of jointing compound to the joint.
  • Ensure that the preceding application and tape is completely covered by making this application wider than the earlier and spread it, to remove visibility of the joint.
  • Feather out joint edges to remove extra material and allow it to dry.

Square Edge Joints

jointing-finishing-squareedge
 
Step 1
  • Firmly stick the 48mm wide self-adhesive fiber mesh tape centrally onto the joint.
  • Apply jointing compound on the fiber mesh tape with tapping knife.
  • Use sufficient pressure to ensure that the tape is firmly placed.
  • The tape should be free from trapped air/bubbles and this application should be approx. 4” wide.
  • Remove extra material lying outside of the joint and allow it to dry.
Step 2
  • Apply a thin layer of jointing compound over the previous application keeping it 8” wide.
  • Remove extra material lying outside of the joint and allow it to dry.
Step 3
  • Apply a thin layer of jointing compound over the previous application keeping it 12” wide.
  • Remove extra material lying outside of the joint and allow it to dry.
  • Make sure that the width of the joints should be as wide as described above. The narrow finished joints will be more visible than the wider one.
Internal & External Corner Joints:

Fiber mesh tape should be used by folding it from its center making it in angle shape (24x24mm) to accommodate both sides of the corners. This folded tape is embedded at corners by using jointing compound as described above.

Screw finishing:

Screw heads should be just below the surface of the board & should not be driven too deep. All nail/ screw heads are to be covered with the jointing compound twice to achieve the right finished surface.

Note:
  • It is recommended that the square edges of the boards should be made tapered (40x1.5mm) at site to achieve good results instead of forming "V" groove.
  • Please make sure the screws are sufficiently & properly driven and there is no movement between the board and steel section, before starting Jointing and finishing.
  • Please make sure that sufficient jointing compound is applied between the board surface and the tape. Please do not depend on the adhesive used with the fiber mesh tape to make it adhesive, because it may not be sufficient to hold the tape with the board surface.