Hebel AAC has a BCA Group Number 1. Hebel PowerBlock walls satisfy BCA 2008 Vol.2 Clause 22.214.171.124 (a) (iii) masonry construction and therefore suitable for boundary wall construction on a Class 1 building.
brick veneer sheets
Hebel PowerBlocks can be laid using construction tools/equipment.
String Line – A string line is required to accurately set out and lay Hebel PowerBlock Walls.
Brick/Blocklaying Profiles – used to gauge the block course are being laid level.
Mixing Bucket – a minimum 20 litre bucket is required for mixing Hebel Mortar, Hebel Adhesive and Hebel HighBuild render.
Electric Drill – an electric drill is required to mix the Hebel Mortar, Hebel Adhesive and Hebel HighBuild render. It is also used to drill clearance holes in the blocks so they can be placed over the tied down rods where required.
Stirrer – fitted to the electric drill, the stirrer is used to mix the Hebel Mortar, Hebel Adhesive and Hebel HighBuild render inside the mixing bucket.
Notched Trowel – the notched trowel is used to apply the Hebel Adhesive to the Hebel surfaces. The width of the trowel must match the block thickness to ensure the adhesive is applied with full and even coverage.
Rubber Mallet – a rubber mallet is required to ‘tap’ the Hebel PowerBlocks onto the adhesive and into place.
Spirit Level – required to install the blocks level and plumb.
Hand Saw – a Hebel handsaw can be used to cut Hebel PowerBlocks to length and height.
Powered Bandsaw – a bandsaw is ideal for cutting Hebel PowerBlocks. (perfect when there are many site cuts to be performed).
Hebel Square – a purpose built square is available for use when marking and cutting Hebel PowerBlocks.
Steel, Plastic and Timber Trowels – these trowels may be required for the installation of the Highbuild render and texture coatings.
Sanding Float – used to even out inconsistencies in the Hebel PowerBlock Wall in preparation for render/texture coats.
Hebel Hand Router – may be used to chase services into solid Hebel walls.
Circular Saw – (fitted with a diamond blade) may be used to chase services into solid Hebel walls.
Electric Router – may be used to chase services into solid Hebel walls.
Crane – may be required to lift large Hebel Lintels and Hebel custom floor panels.
Lifting Grabs – required for use in conjunction with crane for lifting Hebel lintels and custom floor panels.
Scaffold – Scaffold is required when building block walls. The amount of scaffold depends on the height of the walls.
Sealant Gun – required to fill the control joints in the Hebel PowerBlock Walls.
Required only if specified by design /project engineer
Fig 15.1: Strip Footing, Double Brick Sub-Floor
Fig 15.2: Strip Footing, Concrete PowerBlock Sub-Floor
Tie down rods/engineering restraints must be embedded into the footing and pass up through the sub floor and into the Hebel PowerBlock work.
Table 15.1 Top-Plate & Hold-Down selection
|Top Plate & Hold-Down|
|Tile Roof||Sheet Roof|
|N1||A / B / C||B / C|
|N2||A / B / C||D / F|
|N3||D / F||D / F|
|N4||D / F||D / F|
|N5||E / G||E / G|
|N6||E / G||E / G|
|C1||D / F||D / F|
|C2||E / G||E / G|
|C3||E / G||E / G|
|A||90×45 F7 timber top plate / 700mm deep strap @ 1200mm ctrs.|
|B||90×45 F17 timber top plate / 1700mm deep strap @ 2400mm ctrs|
|C||90×45 F17 timber top plate / Ф12mm rod @ 2400mm ctrs|
|D||90×45 F17 timber top plate / Ф12mm rod @ 1200mm ctrs.|
|E||90×45 F17 timber top plate / Ф12mm rod @ 900mm ctrs.|
|F||100x50x3.0 RHS top plate / Ф12mm rod @ 2400mm ctrs|
|G||100x50x3.0 RHS top plate / Ф12mm rod @ 1200mm ctrs.|
Fig 15.3 Hold Down Detail for Reinforced Bracing Walls
Table 15.2 provides ultimate racking capacities of reinforced 150mm and 250mm Hebel PowerBlock walls. The reinforcement is N12 bar or 12mm threaded rod at nominal 1000mm centres. The reinforcement must be tied to the footings and wall top plate through the bond beam. Walls resisting racking forces should be evenly distributed within a house and spaced at a maximum of 8.0m. Ceiling and floor diaphragms must be adequately tied to walls to ensure transfer of forces through to the footings.For more information about bracing, refer to Section 6.11 of the Hebel Technical Manual.
Fig 15.4 Roof Top to Plate Fixing to Hebel Wall – Strap (elevation)
Top Plate Hold-Down
Two tie-down methods are provided in this design guide.
1. Strap – 30×0.8mm cut into inside face of external wall min. 700mm deep.
2. 12mm threaded rod continuous from footing through bond beam to top plate.
Fig 15.5 Roof Top Plate Fixing to Hebel Wall-Tie-Down Rod (elevation)
Three top plates options are provided in this design guide:
1. 90×45 F7 timber
2. 90×45 F17 timber
3. 100x50x3.0 RHS
The type of hold-down method and spacing depends on the top plate, roof type/span, and wind classification. Refer to Table 15.1 for specifications. For high wind areas, the bracing design is likely to require tie-down rods which will drive that as the hold-down method.
Table 15.2 Reinforced Wall – N12 Bars at Nom. 1000mm CTRS
|Min. No. of
|Ultimate Racking Capacity (kN)|
|150mm PowerBlock||250mm PowerBlock|
Base of Wall
Fig 15.6 Hebel PowerBlock work on Stiffened Raft Slab Edge Foundation (elevation)
Fig 15.7 Concrete PowerBlock Sub-Floor Detail (elevation)
Fig 15.8 Double Brick Sub-Floor Detail (elevation)
Fig 15.9 Ring Beam Internal Non-Loadbearing Wall (elevation) (No tie down – as specified by design engineer)
Top of Wall
Fig 15.10 Roof Top Plate Fixing to Hebel Wall – Tie-Down Rod ( elevation)
Fig 15.11 Internal Hebel Load Bearing Wall and Timber Floor Frame Junction (elevation)
Fig 15.12 External Wall and Internal Partition Wall Junction (plan)
Fig 15.13 External Corner with Control Joint (plan)
Fig 15.14 Control Joint detail (elevation)
Fig 15.15 Typical Bond Beam Control Joint – elevation (Location where no tie down required – as specified by engineer)
Fig 15.16 Typical Ring Beam Control Joint – elevation (Location where no tie down required – as specified by engineer)
Fig 15.17 Typical Control Joint – plan
Fig 15.18 Hebel PowerBlock work Typical Movement Joint Detail (elevation)
Fig 15.19 Hebel PowerBlock work Typical Movement Joint Detail (plan)
Fig 15.20 Built-in Column Detail (plan)
Fig 15.21 Built-in Column Detail (elevation)
For all other design details (eg. door, window, floor panels) please follow the previous construction details in Section 14.0)