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Jointing
& finishing

CONCEPT OF JOINTING AND FINISHING

Jointing and finishing is the process through which gypsum Boards systems are transformed into smooth, structurally sound walls and ceilings. This process eventually determines the look of the interiors.

JOINTING AND FINISHING PRODUCTS

LEVELS OF JOINTING AND FINISHING

Traditionally, the quality of a surface has been judged subjectively, with the use of phrases such as “ready-for-painting”, “ready-for-covering” and so on. However, these are not suitable for describing the level of finish. A “finished” and “ready-for-painting” surface for one person may be a sub-standard one for another.

The quality of finish of gypsum board is defined by the Euro Gypsum standards (based on EN 13963). The level of finish is affected by the dimensional tolerances of boards, metal framings and level of workmanship. The flatness of the Drywall and Ceiling also impact the level of finish.

Local Flatness
Standards

A ruler of 200 mm applied on the cladding of the drywall, particularly at the joints, must not have a difference bigger than 1 mm between the most salient point and the point furthest away.

General Flatness
Standards

A ruler of 2000 mm length applied to the face of the drywall and moved in all directions must not have a difference bigger than 4 mm between the most salient point and the point furthest away

Stages Of Jointing And Finishing

Shallow light (natural or artificial) can affect the appearance of the surface. Ideally, lighting conditions where the board systems are used should be known in advance. The surface quality should not be judged by flood-lighting, and the limits of manual workmanship should be considered.

jointining levels

q1

Simply filling the joints between the boards with Pro-Fill / Easi-Fill and Tape

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Jointining Levels Q1

q2

Q1+leveling the joint to the board surface with help of Pro-Fill / Easi-Fill

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Jointining Levels Q2

finishing levels

q3

Q2 + a tight coat (<1mm) over entire board surface with the Pro-Fill / Easi-Fill

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Jointining Levels Q3

q4

Q2 + a skimming coat of Gyproc Champion Skimming Putty (>1mm) over entire board surface

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Jointining Levels Q4

Jointing And Finishing Process

Jointing And Finishing Process Steps

Surface Preparation removes dust from the gypsum board and sets the fixings & screws
below the surface. The homogeneous mixture of Gyproc Easi-Fill®/Pro-Fill®/Pro-Top® with clean
water ensures that no unmixed powder/lumps remain in the mixed material.  

step 1

After framing and boarding the surface is ready for jointing and finishing

step 2

Prefill the joint with Jointing Compound

step 3

Apply first coat of jointing compound with paper tape

step 4

Allow the first coat to dry then apply the second coat

step 5

Allow the second coat to dry then apply the third coat

step 6

Sand joints after jointing compound dries

step 7

Surface is ready after jointing and finishing for final surface finishing

FAQs

Jointing compound are gypsum based powder (or premix) material used to finish Gypsum Board Joints, corner bead, trim, gaps. It is available in powder & premix form.

There are 2 Types of Jointing Compound

  • Air Dry Jointing Compound: Polymer based powdered jointing compound used to fill the joints between gypsum board. Air Dry jointing compound may take up to 24 hrs to dry after application. Drying time may affect due to Humidity & temperature. Air Dry jointing compound available in powder & premix form.
  • Setting Jointing Compound: Gypsum based powdered jointing compound with a setting time from 5 min to 120 minutes (which can be increased further) used for finishing of gypsum board joints, filling gaps, etc.

Gyproc Pro-Top Ready-Mix is all purpose Jointing Compound, which can be used for Jointing & Finishing of Gypsum Board Joints. It is ready-to –use product, with higher crack resistant properties, which can be used on all types of Gypsum Boards.

Easi-Fill Hydro is a gypsum based powdered jointing compound with a setting time of 90* minutes. Easi-Fill Hydro is a moisture resistant jointing compound with reduced Water Absorption designed for quick jointing & finishing of Glasroc H & Moisture Resistant Board. Easi-Fill Hydro is recommended for wet area jointing & finishing.

Surface Preparation:

  • Ensure that all fixings, screws or nails, are seated below the surface of the Gypsum board
  • Remove any dust or loose material from the Gypsum board

Mixing:

  • Mix Gyproc Easi-Fill®/Pro-Fill® with the clean water in the ratio of 1:2 to make a uniform paste. Continue the mixing for 10 – 15 minutes to form a homogeneous mix.
  • Ensure that no unmixed powder / lumps remain in the mixed material.

There three stages in Jointing & Finishing of Gypsum Board.

First Coat

  • Using an applicator / Trowel, fill the recess formed by the edges of the sheets with Gyproc Easi-Fill®/Pro-Fill®.
  • Centre the paper tape along the joint and using a Taping knife / Trowel press the tape down into the Easi-Fill®/Pro-Fill® ensuring no air bubble remain behind the tape.
  • Immediately apply a thin coat of Easi-Fill®/Pro-Fill® over the surface of the tape (100-150 mm wide).
  • Allow it to dry.

Second Coat

  • Apply a second coat of Gyproc Easi-Fill®/Pro-Fill® with an Applicator / Trowel.
  • Ensure that this coat extends outside the area of the first coat (200-250 mm wide).
  • Allow to thoroughly dry and scrape back any build-up of compound along the joint.

Third Coat

  • Apply a finishing coat of Gyproc Easi-Fill®/Pro-Fill®/Pro-Top® with an Applicator / Trowel.
  • Joint edges should be feathered at least 50 mm beyond the edges of the previous coat.
  • Allow to dry. Lightly sand in the same direction as the joint using finer sandpaper.

When jointing two cut edges or sheet ends, which are not recessed, care needs to be taken to ensure the surface build-up of jointing material is minimized. The same basic procedure for tapered edges joints are to be followed as required for the tapered edge method. Take extra care when bedding in the tape to ensure that sufficient jointing material remains behind the tape. The absence of a recess can often lead to the entire jointing material being forced out from behind the tape.