Sharp MD-S10E Specifications Page 14

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STANDARD SPECIFICATION - BUILDINGS
DPI REFERENCE TEXT - APRIL 2009
PAGE 14
Fixing: Fix to the top plate with 50 x 5 mm mild
steel over brackets with 1-M12 bolt to the truss top
chord centre line and 1-M16 bolt to the structure.
4.8 MISCELLANEOUS ITEMS
Roof Battens: Generally 75 x 50 mm Hardwood.
Ceiling Battens: Generally 75 x 38 mm Hardwood.
Fixing: Fix in long lengths with joints at truss crossings
and staggered. Double nail ceiling battens and x
roof battens to Deemed to Comply details.
Valley Boards: Fabricate from 19 mm exterior grade
ply and nail to each rafter.
BLOCK CONSTRUCTION
5. BLOCK CONSTRUCTION
5.1 GENERAL
Cross references
Refer to the following sections:
• Generalrequirements, for termite protection.
• Timber and steel construction, for structural
steelwork.
Standard
Masonry generally: To AS 3700.
Masonry units: To AS/NZS 4455.1 and
AS/NZS 4455.3.
5.2 MATERIALS AND COMPONENTS
Steel components
Galvanizing: Galvanize mild steel components
(including fasteners) to AS 1214 or AS/NZS 4680
as appropriate.
Masonry units
Strength: Generally 15 MPa for structural units.
Colour: Generally grey.
Flashings and damp-proof courses
Standard: To AS/NZS 2904.
Mortar materials
Cement: To AS 3972, Type GP.
Sand: Fine aggregate with a low clay content and
free from eforescing salts, selected for grading and
colour for facework.
Additives: Do not provide additives unless required
and approved.
Mortar mix table
Provide mortar mixes as follows: 1:1:6 cement,
lime, sand for all general block work. Other mix
proportions maybe required for special purposes.
5.3 CONSTRUCTION GENERALLY
Joints and cutting
Set out masonry with joints of uniform width and the
minimum cutting of masonry units.
Joints
Externally: Tool to give a dense water-shedding
nish. Use a 12 mm dia ironing rod.
Internally: Rake to give a key if wall is to be plastered
or strike ush if concealed.
Rod
90 mm high blocks: 6 courses to 600 mm.
190 mm high blocks: 3 courses to 600 mm.
Bond
Stretcher bond unless otherwise noted.
Bedding
Shell bed hollow blocks and completely ll bed joints
and perpends.
Perpends
Keep perpends in alternate courses vertically
aligned.
Double face walls
Select the masonry units for uniform width and
double-face qualities in single leaf masonry with
facework both sides. Before commencement,
obtain a ruling as to which is the preferred wall
face, and favour that face should a compromise be
unavoidable.
Colour mixing
In unpainted facework, distribute the colour range of
units evenly to prevent colour concentrations.
Sills
Use proprietary concrete sill units solidly bedded.
Appearance
Leave unpainted facework clear of mortar smears,
stains and discolouration. Do not clean using an acid
solution and do not erode joints if using pressure
spraying.
Wall Chasing
Chase concrete block walls to a maximum depth of
35 mm for 190 mm blockwork or 20 mm for 90 mm
blockwork. Do not chase walls nominated as re
rated or acoustic.
Protection
Elements: Protect masonry from rain and hot drying
winds for at least 24 hours after laying.
5.4 DAMP-PROOF COURSES
Location
Provide damp-proof courses to the base courses
of external walls on raft slabs or as shown on the
drawings.
Damp proof course: Use mortar with a black damp
course admixture to manufacturer’s instructions.
5.5 CONTROL OF MOVEMENT
Control joints for concrete Blockwork
Specifications March 2009.indd 14 11/03/2009 11:47:10 AM
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