Specifications

STANDARD SPECIFICATION - BUILDINGS
DPI REFERENCE TEXT - APRIL 2009
PAGE 15
BLOCK CONSTRUCTION
Maximum length of continuous wall: 6 m.
Minimum width of control joint: 10 mm.
Flexible ties and anchors
If ties or anchors extend across control joints,
provide ties or anchors which maintain the stability
of the masonry without impairing the effectiveness
of the joint.
Proprietary Item: Masonry exible anchors MFA3/3
install at 400 crs max.
Joint material
Installation: Clean the joints thoroughly and insert
a 19mm dia closed cell expanded polyethylene
compressible backing rod before sealing.
Sealant depth: Fill the joints with gun-applied
Thioseal 5000 single pack polysulphide exible
sealant for a depth of at least two-thirds the joint
width.
Sealant Type: external, UV stable.
5.6 STEEL LINTELS
Cold-formed lintels
Proprietary cold-formed at-based type designed to
AS/NZS 4600.
Steel ats and angles
Sizes: To BCA Volume 2 Figure 3.3.3.5.
Material:
Mild steel galvanized to AS/NZS 4680.
Do not cut after galvanizing.
Corrosion protection: To AS/NZS 2699.3.
Installation
General: Install with the longer leg vertical. Keep
lintels 10 mm clear of heads and frames. Pack
mortar between the angle upstand and supported
masonry units.
Propping: To prevent deection or excessive rotation,
temporarily prop proprietary cold-formed lintels until
the masonry reaches its required strength.
Minimum propping period: 3 days.
5.7 REINFORCED MASONRY
Designation
Masonry required to be strengthened with
embedded steel reinforcement (other than bed joint
reinforcement) is designated reinforced masonry.
Cleaning core holes - Hold Point
Hold Point: In blockwork use purpose-made
cleanout blocks or machine cut a cleaning hole at
the base of each reinforced core, located on the
side of the wall which is to be rendered or otherwise
concealed. After cleaning out has been inspected
and approved, cover the hole with formwork and
grout the core.
Bond beams
Use bond beams made from purpose-made hollow
concrete blocks with reinforcement grouted in place.
Install 6 mm bre cement or proprietary metal closers
at non reinforced cores of the wall below.
Reinforcement: As shown on the drawings.
Starter bars: Wire tie core reinforcement to starter
bars.
Lintel blocks
Purpose made U shaped blocks with reinforcement
grouted in place.
Clean out blocks – Witness Point
Location: At the base of each core to be grout lled
including above bond beams and stage lled walls.
Hole size: Machine cut 100 x 100 mm.
Witness Point: Sealing: Following inspection of the
core and reinforcement form over holes to contain
core lling grout.
Core lling grout
Reference: Refer to the Concrete Construction
section.
Structural blockwork: Fill core holes, bond beams
and lintels etc. of structural blockwork with pre
mixed grout.
Placing: Wait at least 3 days after construction of
blockwork before placing grout. Limit the height
of pours to 3 m. Grout ll all cores below ground
level.
Specifications March 2009.indd 15 11/03/2009 11:47:10 AM