Wall and ceiling areas abutting window mullions or skylights, long hallways, or atriums with large surface areas flooded with artificial or natural light are a few examples of critical lighting. Critical lighting (especially side-lighting) may reveal even minor surface imperfections. Light striking the surface obliquely, at a very slight angle, greatly exaggerates surface irregularities. If critical lighting cannot be avoided, the effects can be minimized by skim coating the entire wall or by decorating the surface with medium or heavy textures (paint or vinyl).
The use of drapes and/or blinds can also be used to soften shadows. It is also important to remember that during the construction phase of a building the lighting is often not fully functional and the appearance of the drywall could vary considerably once this is switched on. In general smooth non-textured finishes highlight surface defects and textures help to hide minor imperfections.
Inspection of installed Partition and glass shall, amongst others, be carried out according to the following criteria: 3.1 SCRATCHES AND BLEMISHES This inspection will be viewed under lighting conditions applicable to the area as laid down in SANS 10114-1 Table 8.0 Illuminance and glare index, in particular, the OHS Act Safety Lux value and at a distance of 3 metres.
Refer Annex 3, which represents the values, stated in abovementioned Table 8.0 of SANS 10114-1. 3.2 ALUMINIUM & PARTITION FINISHES Scratches on aluminum and partition finishes are defined as being a mark on the surface which penetrates the powder coated or anodized surface, and/or Vinyl/painted partition panels thereby exposing the base material. 3.3 GLASS In laminated glass interlayer bubbles larger than 1.5mm diameter will not be allowed.
Larger clusters or close spacing of smaller bubbles will also be disallowed. If visible when viewed from a distance of three meters under normal lighting conditions scratches in the glass will not be acceptable.