How to avoid problems with glancing light
    General
  • Glancing light causes defects to magnify in any surface.
  • Under certain lighting conditions, it is almost impossible to hide joins in plasterboard.
  • Often glancing light problems are reduced once curtains have been installed .
  • Take more care with areas prone to glancing light.
  • Here are some areas that are prone to glancing light.
    • Long walls such as hallways.
    • Large flat ceilings with large windows at the end of the room.
    • Ceilings near high windows.
    • Walls near sky lights
    • Stair wells
    • Glare from floor tiles or even the next door neighbors roof!
    • Down lights shining onto a wall
    • Light stands reflecting into a corner
  • The normal standard for plastering is known as level 4 finish.
  • Level 4 finish is not good enough in glancing light areas if you want a near perfect finish.
  • The solution is a level 5 finish (explained below)
  • Plasterer would rarely include for a level 5 finish in their quote unless requested.
    Suggestions to reduce the effect of glancing light
  • Block or diffuse light source
  • Use flat paint.
  • Paint with a fluffy roller.
  • Avoid dark colors.
  • Apply a texture finish
  • Use a level 5 plastering finish in effected areas.
  • Create an opposing light source.

For more information on glacing light.

Level 5 finish

Even a completely flat join can show with the effect of glancing light. The reason for this is that the join has a different surface texture to the board. A level 5 finish creates a single wall texture, that will hide this effect.
To create a level 5 finish the joins should be finished off as normal, then a skim coat of top coat is applied to the entire surface. Then lightly sand back to a smooth even finish.

For more information on level 5 finish.

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