ABCB Housing Provisions
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5.6
Part 5.6 Masonry components and accessoriesPart 5.6 Masonry components and accessories
5.6.1
Application
New for 2022
5.6.2
Masonry units
2019: 3.3.5.3
The exposure classification or durability of a masonry unit is a measure of its resistance to attack by soluble salts, either in the ground or in the atmosphere. All masonry products manufactured are classified by their durability. The majority of uses will require either an Exposure class (Exp) product or a General Purpose (GP) product.
5.6.3
Mortar mixes
2019: 3.3.5.4
Mortar used for masonry construction must comply with AS 3700 or AS 4773 except that the mortar may be mixed by volume in the proportions stated in Table 5.6.3.
Masonry unit exposure classification | Mortar mix by volume Note 1 Cement: lime: sand | |
---|---|---|
General use | Suitable for concrete masonry Note 2 | |
Protected | 1:2:9 | 1:0:5 |
General purpose | 1:1:6 | 1:0:5 |
Exposure class | 1:0.5:4.5 | 1:0:4.2 |
5.6.4
Mortar joints
2019: 3.3.5.5
5.6.5
Wall ties
2019: 3.3.5.10
Masonry wall ties must—
Direction | Wall tie spacing | |
---|---|---|
450 mm wall stud spacing | 600 mm wall stud spacing | |
Horizontal | Maximum 450 mm | Maximum 600 mm |
Vertical | Maximum 600 mm | Maximum 400 mm |
Wall ties that are suitable for higher duties are also suitable for use in lower duty conditions.
Direction | Wall tie spacing (maximum) | |
---|---|---|
Cavity masonry | Solid or monolithic masonry | |
Horizontal | 600 mm | 400 mm |
Vertical | 600 mm | 400 mm |
Wall ties that are suitable for higher duties are also suitable for use in lower duty conditions.
Location | Placement of wall ties |
---|---|
Unsupported panel sides and edges of openings | Within 300 mm of panel side or edge |
Top of veneer panels and top of panels under openings | Within 300 mm or two courses (whichever is the lesser) of the top of veneer |
Bottom of veneer panel in masonry rebate sealed with liquid applied damp-proof course | Within 300 mm or two courses (whichever is the lesser) from the bottom of the veneer |
Bottom of veneer panel supported on steel lintel | |
Bottom of veneer panel in masonry rebate with membrane damp-proof course | In each of the first two courses |
Intersection of internal walls and external walls | 350 mm vertically or 3-4 courses |
Where articulation joints occur | At both sides of the articulation joint within 300 mm from the joint |
Engaged piers | Within 200 mm of the top of the pier |
Exposure condition | Tie specification (minimum corrosion protection) |
---|---|
Areas less than 1km from breaking surf; or less than 100 m from salt water not subject to breaking surf; or within heavy industrial areas. | Grade 316L stainless steel; or engineered polymer complying with the requirements of AS 2699.1. |
Areas 1km or more but less than 10km from breaking surf; or 100m or more but less than 1km from salt water not subject to breaking surf. | Sheet steel and bar ties galvanised after manufacture - 470 g/m2 on each side; or galvanised wire ties - 470 g/m2 coating mass; or Grade 304L stainless steel. |
All other areas | Galvanised sheet steel - 300 g/m2 coating on each side; or sheet steel ties galvanised after manufacture - 300 g/m2 on each side. |
Where wall ties are required, they must be placed in adjacent courses (as shown) or must be placed in the same course on each side of the stud.
Wall ties that are suitable for use in a more severe exposure condition are also suitable for use in less severe exposure conditions, i.e. stainless steel and engineered polymer ties are suitable for use in all conditions and 470g/m2 galvanised ties can be used in all exposure conditions except the most severe.
Where wall ties are required, they must be placed in adjacent courses (as shown) or must be placed in the same course on each side of the stud.
5.6.6
Fixing straps and tie-down systems
New for 2022
Roof tie-down over openings more than 1200 mm wide in masonry construction must be specifically designed in accordance with relevant material and structural design standards.
5.6.7
Lintels
2019: 3.3.5.12
Where a lintel is required it must comply with the following:
Lintel | Maximum clear span of lintel (mm): ≤ 600 mm of masonry over opening | Maximum clear span of lintel (mm): > 600 mm of masonry over opening |
---|---|---|
Flat 75 x 8 | 700 | 700 |
Flat 100 x 10 | 900 | 900 |
Angle 90 x 90 x 6EA | 3000 | 2650 |
Angle 90 x 90 x 8EA | 3200 | 2800 |
Angle 100 x 100 x 6EA | 3350 | 2900 |
Angle 100 x 100 x 8EA | 3600 | 3040 |
Angle 150 x 90 x 8UA | 4200 | 3850 |
The lintels described in this Table must be not less than grade 300 MPa in accordance with AS 4100.
Durability class of lintel in accordance with AS 2699.3 Note 1 | Material or protective requirements in accordance with AS 2699.3 Note 1 |
---|---|
R1, R2 | Hot dip galvanised with a minimum average coating thickness of 300 g/m2; or stainless steel 316L |
R3 | Hot dip galvanised with a minimum average coating thickness of 600 g/m2; or stainless steel 316L |
R4 | Stainless steel 316L |
5.6.8
Vertical articulation joints
2019: 3.3.5.13
For the purposes of 5.6.8, the vertical articulation joint also performs the function of a contraction or expansion joint.
Masonry unit exposure classification | Mortar mix by volume Note 1 Cement: lime: sand | |
---|---|---|
General use | Suitable for concrete masonry Note 2 | |
Protected | 1:2:9 | 1:0:5 |
General purpose | 1:1:6 | 1:0:5 |
Exposure class | 1:0.5:4.5 | 1:0:4.2 |
Direction | Wall tie spacing | |
---|---|---|
450 mm wall stud spacing | 600 mm wall stud spacing | |
Horizontal | Maximum 450 mm | Maximum 600 mm |
Vertical | Maximum 600 mm | Maximum 400 mm |
Wall ties that are suitable for higher duties are also suitable for use in lower duty conditions.
Direction | Wall tie spacing (maximum) | |
---|---|---|
Cavity masonry | Solid or monolithic masonry | |
Horizontal | 600 mm | 400 mm |
Vertical | 600 mm | 400 mm |
Wall ties that are suitable for higher duties are also suitable for use in lower duty conditions.
Location | Placement of wall ties |
---|---|
Unsupported panel sides and edges of openings | Within 300 mm of panel side or edge |
Top of veneer panels and top of panels under openings | Within 300 mm or two courses (whichever is the lesser) of the top of veneer |
Bottom of veneer panel in masonry rebate sealed with liquid applied damp-proof course | Within 300 mm or two courses (whichever is the lesser) from the bottom of the veneer |
Bottom of veneer panel supported on steel lintel | |
Bottom of veneer panel in masonry rebate with membrane damp-proof course | In each of the first two courses |
Intersection of internal walls and external walls | 350 mm vertically or 3-4 courses |
Where articulation joints occur | At both sides of the articulation joint within 300 mm from the joint |
Engaged piers | Within 200 mm of the top of the pier |
Exposure condition | Tie specification (minimum corrosion protection) |
---|---|
Areas less than 1km from breaking surf; or less than 100 m from salt water not subject to breaking surf; or within heavy industrial areas. | Grade 316L stainless steel; or engineered polymer complying with the requirements of AS 2699.1. |
Areas 1km or more but less than 10km from breaking surf; or 100m or more but less than 1km from salt water not subject to breaking surf. | Sheet steel and bar ties galvanised after manufacture - 470 g/m2 on each side; or galvanised wire ties - 470 g/m2 coating mass; or Grade 304L stainless steel. |
All other areas | Galvanised sheet steel - 300 g/m2 coating on each side; or sheet steel ties galvanised after manufacture - 300 g/m2 on each side. |
Lintel | Maximum clear span of lintel (mm): ≤ 600 mm of masonry over opening | Maximum clear span of lintel (mm): > 600 mm of masonry over opening |
---|---|---|
Flat 75 x 8 | 700 | 700 |
Flat 100 x 10 | 900 | 900 |
Angle 90 x 90 x 6EA | 3000 | 2650 |
Angle 90 x 90 x 8EA | 3200 | 2800 |
Angle 100 x 100 x 6EA | 3350 | 2900 |
Angle 100 x 100 x 8EA | 3600 | 3040 |
Angle 150 x 90 x 8UA | 4200 | 3850 |
The lintels described in this Table must be not less than grade 300 MPa in accordance with AS 4100.
Durability class of lintel in accordance with AS 2699.3 Note 1 | Material or protective requirements in accordance with AS 2699.3 Note 1 |
---|---|
R1, R2 | Hot dip galvanised with a minimum average coating thickness of 300 g/m2; or stainless steel 316L |
R3 | Hot dip galvanised with a minimum average coating thickness of 600 g/m2; or stainless steel 316L |
R4 | Stainless steel 316L |