Wednesday, 29 June 2016

How to prepare the work area before plastering

For a good bond, the prepared surface should be rough, hard and clean. We follow these steps when preparing the work area for plastering:
Remove all dust, dirt and oily substance from the walls by high-pressure hosing with water, vacuum cleaning and blowing with oil-free compressed air.
Remove all protrusions like metal studs, nails or rivets.
Check that the substrate is plane (flat and even) and vertical. There should be no areas that protrude or are depressed.
If necessary, roughen the substrate to allow the plaster to bond properly with it. We will use one of the following methods to do this:
  • Wire brushing
  • Hacking/chopping
  • Abrasive grit blasting
  • Application of a splatter-dash layer
  • Application of bonding liquids
  • Application of mechanical supports
Ensuring that the wall is strong enough as plaster will break away from the brittle substrate.
Testing the area for water absorbency. If it is too dry it will absorb the moisture from the plaster. The plaster will then dry out too quickly and will not bond properly with the substrate and will flake off.
On the day before plastering, wet the area well.
Clear the surrounding area of all materials and tools that you do not need for the job. This is to ensure that the area is safe and suitable for the work.

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