Attached piers as applied to 1/2 brick (90 mm min.) thick walls ~- Major openings A and B are permitted in one wall only.
Aggregate width is 5m maximum. Height not greater than 2.1 m.
No other openings within 2 m. - Other walls not containing a major opening can have smaller
openings of maximum aggregate area 2.4 m^2. - Maximum of only one opening between piers.
- Distance from external corner of a wall to an opening at
least 390 mm unless the corner contains a pier. - The minimum pier dimension of 390 190 mm can be varied to
327 215 mm to suit brick sizes.
Attached Piers