Technical Buzz: Painting of Plasterboard

Painting of Plasterboard

For anyone who has ever been involved in paint/plaster disputes in the past, you already know irrespective of the nature of the complaint:
Paint coverage, mud cracking, gloss banding, discolouration, staining, nap raising, and the list goes on.

It’s always been the plaster’s fault” – “Please explain”

Painters are no different to plasters, price is all important and they too have to be competitive to make a living.

Short cuts and cost cutting however are not exclusive to the plasterer, the painters bag of tricks is extensive also and may come as a surprise to many.

With all that said, why can it never be the paint?

It should be noted that the majority of issues relate to domestic construction. Not so frequently on commercial projects where paint specifications, quality of paint thickness, number of coast etc are nominated in the scope of works.

Oddly enough the same old industry issues have been around for many years. Despite changes in both techniques and technology to paint and plaster alike. The issues we are faced with today are not different to those we faced many years ago. The only difference is a lack of experienced by those witnessing the problem for the first time.

You should know:

  • Plaster compounds, unlike paint products come in only one quality
  • Although with paint there is a difference on a quick trip to the local hardware store to check out the comprehensive range of paint products - you quickly realise that, unlike plaster compounds, paint comes in many quality and price variations.
  • Paint is no different to most products, you get what you pay for.
  • Cheap paint is not quality paint in a different container.
  • Now, most would also know when it comes to proper application specifications are stretched to the limit with back rolling all coats avoided like the plague and proper drying times sacrificed for the sake of speed.

Tolerances:
The Australian/New Zealand standards contain specified allowable tolerances for plaster jointing and external and internal angle finishes.

Recess Edge Joints are unacceptable if:

  • The total width is less than 250mm
  • The joint is hollow i.e. light can be seen in the centre of the joint when viewed with a straight edge placed at right angles across the joint.
  • The joint is overbuilt that is the build up of the joint exceeds 2mm over the width of the joint.
  • The joint build is less than 2mm over the width of the joint but the profile of the joint exhibits a distinct peak of ridge at the centre that is the joint does not have an even convex profile over its full width.
  • Gouges scratches, voids or pock marks are visible in the joint cement/compound.

Expectations:
There is no doubt most consumers expectations of plasterboard finishes are for an absolute blemish-free finish. There is also no doubt that this view is also shared by the builder, plasterer and painter as exactly what they set out to produce.
In reality all that can be expected is an appearance of flatness. – Absolute Blemish – free surfaces are extremely difficult, if not impossible to achieve.

Level 5:
Level 5 finish is difficult to achieve and always requires the cooperation of the framer, plasterer and painter in establishing suitable work practices that deliver and agreed painted finish to the project.
Level 5 does not mean the surface is free of texture variation. Minor surface imperfections may still be visible in accordance with the standard.

By |2018-09-03T03:01:36+00:00April 24th, 2018|Technical|