An opaque or coloured ﬁlm must be applied to glazed screens and glass doors to comply with Building Regulations Part N and Part M. The manifestation can be a major part of the interior design concept and not just installed where blinds are not ﬁtted.
- People with visual impairment should be in no doubt as to the location of glass doors especially when they are within a glazed screen. The choice of different style of manifestation for the door and the glazed screen can help to differentiate between them.
- Glass doors and glazed screens will satisfy Requirement M1 or M2 if:
- They are clearly deﬁned with manifestation on the glass at two levels, 850 to 1000mm and 1400 to 1600mm, contrasting visually with the background seen through the glass (both from inside and outside) in all lighting conditions
- Manifestation takes the form of a logo or sign at least 150mm high (repeated if on a glazed screen), or a decorative feature such as broken lines or continuous bands, at least 50mm high.
- Corridors and passageways will satisfy the Requirement of M1 and M2 if:
- Any glazed screens alongside a corridor are clearly deﬁned with manifestation on the glass at two levels, 850mm to 1000mm and 1400mm to 1600mm, contrasting visually with the background seen through the glass in all lighting conditions (see illustrations above for details of manifestation).
Deﬁnitions – Contrast Visually When used to indicate the visual perception of one element of the building, or ﬁtting within the building, against another means that the difference in light reﬂectance value between the two surfaces is greater than 30 points.
Note: Where there appears to be a conﬂict between the guidance in Part M and Part N, Part M takes precedence.