Gyprock jointing compounds are classified as either setting type, drying type or acrylic drying type. All compounds can be applied by hand or with mechanical jointing tools. Setting type compounds produce stronger joints and reduce installation delays and shrinkage associated with drying-type compounds. They are recommended for experienced trades people and have a defined setting time e.g. 40 or 60 minutes.

Setting type compounds are: BASE COAT 45, BASE COAT 60. Additional coats may be applied over setting type compounds once they have gone hard (set), usually 40 minutes to an hour. A drying type compound must be used as a finish coat and must be completely dry before sanding. This may take up to 24 hours.

Drying type compounds are: JOINTMASTER TOPPING, TOTAL COAT-LITE, TAPE and TOPPING, EASY FINISH, and PRO-LITE TOPPING. These products are premixed and TOTAL COAT-LITE is also available dry.

Acrylic drying type compounds are: WET AREA BASE COAT. This compound, when used in conjunction with Paper Tape or Easytape, produces very strong and durable joints. These joints are resistant to a some movement without displaying cracking. Drying type compounds will shrink and harden with evaporation of their water content. The joints must be allowed to set and appear completely dry before re-coating or sanding. Actual drying times will be extended in low temperature and high humidity conditions. Do not use a setting type compound over a drying type compound.

Jointing Tape

Gyprock Perforated Paper Tape has been developed to enable the preparation of strong joints and should be used on butt and recess joints. Gyprock Easytape is ideal for use with Wet Area Base Coat, provided it is bedded into the compound. Sticking Easytape to the fibre cement sheet is not recommended, and could result in cracking.

Tiled Areas Jointing of Recessed Joints (System A or B Only).

Tape Coat.

1. Fill recess evenly and fully with Wet Area Base Coat.

2. Bed in the tape centrally over the joint, and cover lightly with Wet Area Base Coat.

3. Cover all fastener heads with Wet Area Base Coat.

4. Allow tape coat to completely dry before proceeding.

1. Apply a second coat, about 180mm width, with enough compound to cover the tape. Feather edges.

2. Cover fastener heads with a second coat, extending beyond the first coat by about 25mm.

3. Allow the second coat to dry completely before proceeding.

IMPORTANT: Do not tape and set internal angle in tiled area. Above the tile line, tape and set the joint as shown for non-tiled areas.

Non-Tiled Areas. Jointing of Recessed Joints (Systems C, D, E, F, G or H).

Tape Coat.

1. Fill recess evenly and fully with tape coat.

2. Bed in the tape centrally over the joint, lightly cover with compound.

3. Cover all fastener heads with tape coat.

4. Allow tape coat to set/completely dry before proceeding.

1. Apply a second coat, about 180mm width. Feather the edges with a trowel.

2. Cover fastener heads with a second coat, extending beyond the first coat by about 25mm.

3. Allow the second coat to set/completely dry before proceeding.

1. Apply a finish coat centrally over the second coat, about 270mm width. Feather the edges with a trowel. (If required, soften the outer edges of the compound with a damp water brush before feathering).

2. Cover fastener heads with a finish coat, extending beyond the second coat by about 25mm. Ensure that the edges of the compound are neatly feathered and that there are no knife edge marks left in the final stopping.

• When set/completely dry, sand compound smooth with 150 grit paper or with 220 grit sanding mesh. Avoid any heavy pressure which might scuff the joints.