Masonry distress (Cracking)
Where distress and rated Category 3 or more (i.e. more than 5 mm; refer AS 2870 – 1996 Residential Slab & Footings Construction)
Bricks shall generally be laid with true brick face outwards. When bricks in batches are supplied from manufacturers may vary in colour therefore they shall be mixed and or distributed in accordance with manufacturers recommendations.
To be in accordance with the Part 3.3.4 of the BCA.
Brick sills – shrinking allowance for timber framing
Reference to brick sills includes for sill tiles.
Distortion of window frames and or dislodgment of sill bricks shall be a defect where such distortion and or dislodgement were caused by lack of initial sill brick clearance from the window sill refers to Part 3.3.1 of the BCA.
These clearances must be provided at the time of construction and must not be less than
(i) 5 mm at sills of lower and single storey windows; and
(ii) 8 mm at roof overhangs of single storey buildings; and
(iii) 10 mm at sills of second storey windows; and
(iv) 12 mm at roof overhangs to two storey buildings.
Concrete slab distress
If the distress is rated at less than Category 3, the defect is to be mentioned for a period of twelve months. If at the end of the monitoring period, the distress rating is assessed as greater than
Category 2, this will be considered a defect.
Where a residential slab designed in accordance with AS 2870-1996 or AS3600-2001concrete structures is to act as a termite barrier in accordance with AS3660-200 Termite management, shrinkage cracks through the slab are not to exceed 1.0 mm width.
Extract from AS2870-1996 – Residential slabs and footings – construction