Does your glazier/contractor or glass supplier engage in best practice?
South African Standards and their absolute adherence are essential to ensure the protection and safety of people living and working in residential and commercial buildings.
SANS 10400-N:- The application of the National Building Regulations Part N: Glazing
SANS 10137 – The installation of glazing in buildings.
SANS 1263-1 – Safety and security glazing materials for buildings – Part 1: Safety performance of
glazing materials under human impact.
Always ask if your glazier/contractor or glass supplier is an SAGGA accredited member.
What can go wrong?
Mechanical performance criteria of fenestration products are determined in accordance with SANS 613
This standard specifies the criteria for the performance in respect of wind action (deflection and structural strength), water penetration, air penetration and operation of fenestration products (such as windows, doors, curtain walls and roof lights), within the confines of the perimeter of the main frame, irrespective of the framing material.
When testing for deflection (wind load) the fenestration product shall not show any visible signs of cracking or functional impairment, and the deflection shall not exceed 1/175th of the span (positive or negative).
Failure to comply with wind load requirement – fenestration blown out of building
When testing for structural strength, the product shall not crack or undergo any permanent deformations.
Water & air tightness
When testing water tightness, the products shall show no signs of water penetration to the inside of the frame.
When testing air tightness:
a) the air penetration through the products shall not exceed 2 L/s/m2 fenestration area,
b) the average airflow rate for fixed glazing shall not exceed 0,306 L/s/m2 fenestration area, and
c) the air penetration through revolving doors and swing doors shall not exceed 5 L/s/m2 fenestration area.
Safety glazing In accordance with SANS 10400 Part N – Glazing
The panes of all safety glazing material shall be permanently marked by the installer in such a manner that the markings are visible in individual panes after installation.
Safety glazing material shall comply with the requirements of SANS 1263-1 and shall be used in the following occupancy or building classification:
a) A3 – Places of instruction;
b) E1 – Places of detention;
c) E2 – Hospitals; and
d) E3 – other institutional or residential buildings
Where safety glazing shall be installed?
• a window has a sill height of less than 500 mm from the floor;
• a window has a sill height of less than 800 mm from the floor without any permanent barrier that prevents persons from coming into contact with the glass panel, and is so placed that persons are likely, on normal traffic routes, to move directly towards such window;
NOTE A barrier could be any feature, i.e. a heavy bar across a window, or a flower box placed in front of the window, that will provide a physical or visual barrier between the glass and a person.
• a bath enclosure or shower cubicle is glazed or where glazing occurs immediately above a bath;
• glazing is used in any shop front or display window within 2 100 mm from the finished floor level;
• glazing is used in any wall or balustrade to a stairway, ramp, landing or balcony;
• glazing is used within 1 800 mm of the pitch line of a stairway or the surface of a ramp, landing or balcony;
• glazing applications are sloped or horizontal;
• a mirror is installed as a facing to a cupboard door less than 800 mm above floor level and there is no solid backing;
• glazing is used around areas such as swimming pools and ice rinks; and
• glazing is used in internal partitions, which are within 2 100 mm of floor level.
The familiar jagged edge pattern with lethal slivers of glass which, depending on the strength of impact, either fly out or remain precariously intact. Often the removal of shattered pieces is difficult and dangerous.
Laminated safety glass – A web-like pattern is the result of a bonded vinyl interlayer holding two sheets of broken laminated glass basically intact. With this tendency to “give” and not fall out under impact, the severity of physical injury is decidedly lessened. Broken laminated safety window glass will remain intact as a barrier against weather while visibility is partially retained. Grade A laminated safety glass can be used anywhere there is a risk of human impact.
Glass in balustrades shall be toughened safety glass unless rigidly supported on all sides.
Toughened safety glass
In the event of toughened glass being broken, the particles are small, and are relatively harmless compared with the sharp splinters resulting from the breakage of ordinary glass. Grade A toughened safety glass may be used where the possibility of human impact exists or in any situation requiring strength, safety or resistance to temperature fluctuations.