• When compound is dry, sand smooth with 150 grit paper or cloth, or with 150/180/220 grit sanding mesh. FIG 34: PROCEDURE FOR JOINTING OF INTERNAL CORNERS Tape Coat Paper Tape Finish Coat CSR GYPROCK plasterboard FIG 36: PROCEDURE FOR JOINTING OF EXTERNAL CORNERS Jointing Compound (3 coat system) CSR GYPROCK plasterboard External Angle Bead FIG 35: JOINTING OF EXTERNAL CORNERS 3mm typical build up GYPROCK Plasterboard External angle bead GYPROCK ™ RESIDENTIAL SYSTEMS 38
JOINTING WITH MECHANICAL TOOLS The use of mechanical tools to joint Gyprock ™ plasterboard is becoming more popular, and used correctly, these tools can significantly increase productivity by cutting the amount of time taken to finish a job. The Gyprock ™ range of drying type compounds are designed for use when jointing with mechanical tools. Easy Flow, Total Coat-Lite, and Total Coat-Lite – Premixed, can each be used as a three coat system. Jointmaster, Easy Finish and Pro-Lite Topping Compound are for use in mechanical tools as finishing coats only. Premixed compounds should be used directly from the bucket, but can, if necessary, be thinned down with water, used sparingly. Follow the instructions provided on the product packaging. Apply third coat with 250mm or 300mm box Apply second coat with 200mm box FIG 37: JOINTING OF RECESSED JOINT Roll internal corner Apply second coat with 65mm finishing tool Feather out second coat with 75mm finishing tool FIG 38: JOINTING OF INTERNAL CORNER GYPROCK ™ RESIDENTIAL SYSTEMS 39
ARCHES Gyprock ™ plasterboard may be used to line arches in timber and metal frame construction and may be formed as semi- circular, segmental, elliptical or other profiles prepared by the builder. Arches are finished with arch bead and corner bead to reinforce the corners and maintain an accurate profile. The Gyprock ™ Arch Bead is designed for use with all thicknesses of Gyprock ™ plasterboard. Frame Preparation The builder is to construct the frame to the selected profile using minimum 12mm thickness particleboard/MDF templates, positioned flush with both faces of the wall framing. Installation of Gyprock ™ Plasterboard • Apply Gyprock ™ plasterboard with the recessed edges horizontal to the main stud framing. • Ensure that butt joints do not occur over the arch or within 200mm of the side of the arch. • Mark the profile of the arch on one side of the opening, allowing the wall sheet to project past the curved edge of the template and inner edge of the stud framing by the thickness of the plasterboard being used. • Cut the face sheet accurately, using a keyhole saw. • Square the profile across the opposite side before marking and cutting the other sheet. • Fix plasterboard to particleboard templates along cut-out edges with screws at 300mm centres or with a bead of stud adhesive.
- Timber framing, Gyprock Plasterboard, Recessed Edge