The number and position of location blocks shall be as shown in Figs. 11 and 12.
Location blocks shall be,
a) of minimum of 25 mm in length;
b) at least as wide as the glass thickness;
c) positively located to prevent displacement in service; and
FIG. 11 POSITION OF LOCATION BLOCK
PART 6 STRUCTURAL DESIGN — SECTION 8 GLASS AND GLAZING
(a) FIXED LIGHT
(b) SIDE HUNG, PROJECTED SIDE HUNG OR DOOR
(c) VERTICALLY PIVOTED HUNG CENTRALLY (OPENING 90° or 180°)
(d) VERTICALLY PIVOTED (HUNG OFF-CENTRE)
(e) TOP HUNG OR PROJECTED TOP HUNG
(f) BOTTOM HUNG
(g) HORIZONTALLY PIVOTED AND OPENING UPTO 90° or 180°
(h) TILT AND TURN
(j) VERTICAL SLIDING
(k) HORIZONTAL SLIDING (6 BLOCK TO EACH PANE)
(m) MINIMUM POSITION OF BLOCKS FOR ALL TYPE OF CASEMENTS AND SLIDING WINDOWS
FIG. 12 RECOMMENDED POSITIONS OF SETTING AND LOCATION BLOCKS FOR THE SITE GLAZING OF SOME TYPES OF DOORS AND WINDOWS
d) sufficiently resilient to accommodate movement within the frame, without imposing stress on the glass, and of resilient, non-absorbent material.
1 Location blocks are used between the edges of the glass and the frame to prevent movement of the glass within the frame by thermal expansion or when the window or door is opened or closed. They are required to prevent the weight of the glass from causing the frame to become out of square.
2 Extruded rubber material with 55 - 65 shore A hardness is recommended.