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Plasterboard Walls

Plasterboard Wall Sheets

Plasterboard is used as an internal lining board to provide smooth, strong, long-lasting walls and ceilings. Its durable surface will accept most types of decorative finishing, including paint, wallpaper and texture compounds.

Design Considerations

Levels of Finish

Levels of finish are defined in the Australian/New Zealand Standard AS/NZS 2589.1 : 1997 ‘Gypsum linings in residential and light commercial construction – Application and Finishing.’ This standard is intended to provide builders, plasterboard installers and finishers, and their customers with the various defined methods and practices necessary to meet the customer’s expectations in terms of the ‘Level of Finish’.

Problems with Plasterboard

Cracks are one of the biggest problems that occur with plasterboard. When cracks appear in plasterboard, they typically occur wherever there is a change in direction; for example in hallways and ceilings. Gypsum wallboard is one of the most commonly used varieties of plasterboard, and changes in temperature and/or moisture can cause stress, movement and subsequently, cracking within it.

Control Joints

Movement and stresses created by temperature and humidity fluctuation can result in deformation and damage to internal linings and partitions. As a means of preventing cracking, it is recommended that plasterboard surfaces be isolated from structural elements, except the floor, by the use of control joints spaced apart appropriately, at approximately 9 metres from floor to ceiling or other means where:

• A plasterboard surface abuts any structural element or dissimilar wall or ceiling assembly
• The construction changes within the plane of the partition, wall or ceiling lining
• Control joints incorporated in a building to permit movement in the structure must be carried through all areas lined with plasterboard.


Any imperfection in a completed lining installation will be made obvious by a condition called critical lighting or glancing light, where the incident light from an artificial or natural light source is nearly parallel to the surface. Glancing light also greatly exaggerates the size of imperfections making them glaringly obvious.

Ways to minimise the effect of critical lighting from artificial lighting sources:

• Locate fluorescent lights about 450mm below the ceiling, as this will give a more even distribution of light
• Use more rather than fewer lights and install at regular spacings to give a more even, diffused light and to minimise the shadows that can occur from a single row or single light source
• Recess light fittings into a ceiling (although recessed lights are more likely to be associated with glare problems)
• Allow a generous angle of incidence to the surface for feature lighting such as spotlights, to minimise the highlighting of imperfections
• Do not locate a single or isolated unshaded light source close to a wall or ceiling in a space that has generally low levels of light
• Do not use uplights, wall-washers and spotlights in areas with a smooth wall finish to eliminate light being emitted at a glancing angle to the surface
• Design soft rather than harsh lighting conditions

Ways to minimise natural lighting problems are:

• Do not take window glazing right up to the ceiling level
• Avoid placing windows immediately adjacent to the end of a wall
• Provide sunshades over the window
• Recess the window to stop the sunlight reaching the wall.


The following situations may give rise to localised high temperature conditions (≥45°) which may be detrimental to wall and ceiling linings:

• Radiant ceiling heaters
• Heat pumps
• Reverse cycle air conditioners
• Solid fuel stoves.

Applied Finish Selection

Finishes applied to plasterboard can have a significant effect on the perceived quality of the installation, particularly where critical lighting conditions exist.

General rules when selecting an applied finish:

• The difference in texture and absorption characteristic between the body of the sheet and the joint may show through some thin paint coatings
• Imperfections show more readily on ceilings than on walls
• Textured or heavy patterned finishes tend to hide imperfections
• Matt finishes minimise imperfection visibility
• Semi-gloss and gloss finishes highlight imperfections.

Lighter colours (when compared to darker colours) are:

• Less likely to show imperfections and impact damage
• More effective at diffusing the light and reducing shadow effects, particularly in smaller rooms

 • Gloss paints tend to highlight paint application variations (e.g. where a good wet edge has not been maintained when painting)
• Paint or thin wallpaper finishes are less tolerant of imperfections
• Paint applied with a longer pile roller tends to mask imperfections better than those applied with a short pile roller.



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ABIS building and pest inspections are conducted to the highest standard by building inspectors with a minimum of 10 years experience together with the highest professional qualifications in their field. ABIS has been in business over 27 years conducting both building and timber pest inspections.

Our highly recommended home inspectors are all long term trusted employees not here today gone tomorrow sub-contractors. ABIS Inspectors are supported by a unique computer aided inspection system and the latest inspection equipment such as high sensitivity thermal cameras costing thousands of dollars that others don’t often have.

When you book a pre-purchase inspection with ABIS, our friendly local (they know the area and are not in a interstate or overseas call centre) staff will make the whole process easy for you. Our Office team make all the arrangements with you, your agent, the vendor, the tenant (if there is one) and you will be sent an email to confirm the inspection time along with a pre-engagement letter which covers the scope of the inspection. Good communication and local knowledge are key to you getting the most out of your building and pest inspection. We are always happy to answer all your questions and you are most welcome to be on site when we do the inspection. Our technology, systems and processes also mean you get your high quality report shortly after your inspection is completed.

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