1.0 Introduction

CSR Panel Systems is a division of CSR Building Products Limited, one of Australia’s leading building products companies.

CSR Panel Systems manufactures Hebel Autoclaved Aerated Concrete (AAC). The AAC in Hebel products is manufactured from sand, lime and cement to which a gas-forming agent is added. The liberated gas expands the mixture, forming extremely small, finely dispersed air pockets, resulting in lightweight aerated concrete.

CSR Panel Systems has manufactured Hebel products that have won wide acceptance as innovative and environmentally preferable building materials. This is due to their lightweight nature, excellent thermal, fire and acoustic properties and design versatility. These inherent properties of Hebel products help achieve quick and cost efficient construction practices as well as providing for comfortable operating environments inside the buildings all year round.

Build a premium home with Hebel PowerBlock  

Hebel PowerBlocks are large AAC Blocks with a standard face dimension of 600mm x 200mm, laid in much the same way as bricks but using Hebel Adhesive to form a monolithic structure. Typically, external walls use a single skin of 250mm thick blocks while internal, non-loadbearing walls use 100mm thick blocks. Hebel’s tight manufacturing tolerances deliver beautifully flat, true surfaces that are easily rendered and painted.

Walls built with Hebel PowerBlock are strong and durable, providing the security of solid masonry coupled with exceptional thermal and acoustic insulation properties. With over three times the thermal resistance of double brick, Hebel PowerBlocks exceed the Building Code of Australia (BCA) for energy efficiency regulations for zones 1,2, 3 and 5 without the need for additional bulk insulation.

Hebel PowerBlocks are non combustible and can achieve an Fire Resistance Level (FRL) of up to 240/240/240.

For detached houses, this is well above the requirements for building right up to the boundary line and making Hebel an ideal choice for bushfire prone areas.

Compared to traditional double brick construction, Hebel PowerBlock walls can be laid much faster, saving building time and costs. Building with Hebel Blocks may create more internal floor area for the same building dimensions.

Hebel Lintels can be used over windows, doors and garage door openings. Hebel also supplies sill blocks for under windows to complement the overall look of your home.

Fig 1.1 Isometric Concept House

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7.0 Structure Power Panels

7.1 Slabs and Strip Footings

Site Classification

Site Classifications are generally carried out for new housing developments, be they part of a subdivision or an individual allotment. The purpose of the site classification is to assess the subsurface conditions and therefore enable determination of the most appropriate foundations/floor slabs (i.e. the classification will generally determine the appropriate dimensions for house footings and / or floor slabs).

Site Classification is carried out in accordance with the Australian Standard AS2870-1996: “Residential Slabs and Footings”.

The available Classes include S (slightly reactive), M (moderately reactive), H (highly reactive), E (extremely reactive), or P (problem site). Classes S, M, H, and E refer generally to sites in which clayey soils will form the founding strata. The classification indicates how reactive the clay subsoil is to changes in moisture content. The reactivity (shrinking and swelling) of the clay can have a significant impact on the footings/slabs of a building slab, which need to be designed to counteract the movements of the clay soils.

Sites classified as Class P generally present difficulties for the proposed construction. The Pclassification more often than not suggests deep and/or uncontrolled fill, which cannot provide suitable bearing for the house. In these situations, the house is either founded on the stable materials beneath the fill (i.e. deep footings/piers), or the fill is removed and replaced with compacted, controlled fill.

Slab Design

All Hebel PowerBlock homes must have footings and slabs designed to AS 2870Full Masonry”. Local engineering advice should always be sought.

 

Fig 7.1.1 Isometric Concept House

 Fig 7.1.2:  Slab on Ground

Table 7.1.1 Slab on Ground
SITE CLASS TYPE OF CONS-TRUC-TION EDGE AND INTERNAL BEAMS SLAB MESH
Depth (d)mm Bottom Reinfor-cement Max. Spacing Centre to Centre (m) Set down(s) mm Width (b)mm Slab Length <18m Slab Length <18m & <25m Slab Length <25m & <30m
CLASS ‘A’  Hebel Masonry Wall 400  3-L8TM  _  50  350  SL72  SL82  SL92
400  3-L8TM  _  100  350  SL72  SL82  SL92
400  3-L8TM  _  150  400  SL72  SL82  SL92
400  3-L8TM  _  >200  450  SL72  SL82  SL92
CLASS ‘S’ Hebel Masonry Wall 400  3-L11TM  5.0 (Note1)  50  350  SL72  SL82  SL92
400  3-L11TM  5.0 (Note1)  100  350  SL72  SL82  SL92
400  3-L11TM  5.0 (Note1)  150  400  SL72  SL82  SL92
400  3-L11TM  5.0 (Note1)  >200  450  SL72  SL82  SL92
CLASS ‘M’ Hebel Masonry Wall 500  3-L12TM  4.0 50  350  SL82  SL82  SL92
500  3-L12TM  4.0 100  350  SL82  SL82  SL92
500  3-L12TM  4.0 150  400  SL82  SL82  SL92
500  3-L12TM  4.0  >200  450  SL82  SL82  SL92
CLASS ‘M-D’ Hebel Masonry Wall SITE SPECIFIC ENGINEERING REQUIRED
CLASS ‘H’ Hebel Masonry Wall SITE SPECIFIC ENGINEERING REQUIRED
CLASS ‘H-D’ Hebel Masonry Wall SITE SPECIFIC ENGINEERING REQUIRED
CLASS ‘P’ Hebel Masonry Wall SITE SPECIFIC ENGINEERING REQUIRED

GENERAL NOTE: This table is to be read in conjuntion with the requirements of AS2870 and AS3600.

NOTES: 1. A 10% increase in the spacing is permitted where the spacing in the other direction is 20% less than specified.

2. Where the number of beams in a particular direction satisfies the requirements of the maximum spacing given above, the spacing between individual beams can be varied provided that the spacing between any two beams does not exceed the spacing given in the above figure by 25%. These allowances for increased beam spacings do not override the maximum spacings between edge beams and first internal beams as required by clause 5.3.9.

3. For two storey timber framed floor or Hebel floor panel construction, the width of the edge beams must be increased by 100mm and the bottom reinforcement must be increased by one bar of the same diameter.

Fig 7.1.3:  Strip Footing, Double Brick Sub-Floor Fig 7.1.4:  Strip Footing, Concrete PowerBlock Sub-Floor Table 7.1.2 – Strip Footing

Site Class Type of Construction Depth (d)
mm
Width (b)
mm
Reinforcement
CLASS ‘A’ Hebel Masonry Wall 300 450 4-L8TM
CLASS ‘S’ Hebel Masonry Wall 400 450 4-L11TM
CLASS ‘M’ Hebel Masonry Wall 600 450 4-L12TM
CLASS ‘M-D’ Hebel Masonry Wall Site Specific Engineering Required
CLASS ‘H’ Hebel Masonry Wall Site Specific Engineering Required
CLASS ‘P’ Hebel Masonry Wall Site Specific Engineering Required

GENERAL NOTE: This table is to be read in conjunction with the requirements of AS2870 and AS3600.

NOTES: 1. For all beams 700mm or deeper, as specified in the table above, internal footings shall be provided at no more than 6m centres, and at re-entrant corners to continue the footings to the opposite external footing.

2. Internal strip footings shall be of the same proportions as the external footing and run from external footing to external footing ‘side slip joints’ consisting of a double layer of polyethylene shall be provided at the sides of the footing only.

3. Provide ventilation to the sub-floor in accordance with the BCA.

Sub-Floors On Elevated Sites

Hebel PowerBlock must not be used at or below ground level. When building a Hebel PowerBlock structure on a sloping site that is not suitable for a concrete slab, a solid core-filled concrete block or brick substructure may be erected on a strip footing to raise the building and floor system to a level that is clear of the ground resulting in a level building platform that allows sufficient airflow under the floor.

The first course of Hebel PowerBlocks must be laid on a DPC to stop rising damp and to act as a bond breaker between the different building elements.

Termite Protection

Hebel PowerBlocks are not a food source for termites. Solid wall construction still requires termite protection. There are many methods to protect your home against a termite invasion and a qualified professional pest control should be consulted to determine the most suitable method for your design.

The Building Code of Australia recognises an exposed slab edge to a depth of 75mm above finished ground level as adequate termite prevention.

For masonry sub-floor construction a continuous ant cap installed between the brick/ concrete block work and the Hebel PowerBlock also satisfies the Building Code of Australia termite protection requirements.

7.2 Hebel PowerBlock Walls

Generally, the minimum recommended wall thickness is:

  • 250mm for external walls
  • 150mm for internal load-bearing walls.
  • 100mm for internal non-load bearing walls.

Hebel suggests considering a wall as having top and bottom lateral restraints only (one-way vertical span) and designing the appropriate wall thickness, so that retrofitting or changing the location of the movement joints will not be detrimental to the lateral load capacity of the wall. In determining the appropriate wall thickness, the designer shall consider a range of factors relating to relevant codes and project specific considerations, these factors may include:

  • Movement joint location
  • Bracing considerations
  • Vertical (compression) loading
  • Out of plane wind/earthquake (lateral) loading
  • Required fire rating level (FRL).

The particular project loading configurations could result in walls that exceed the above minimum requirements.

Ring Beam (for standard trussed roofs)

A ring beam must be provided at the base and top of perimeter Hebel walls. The ring beam is 60mm x 60mm with 1N12 bar centrally located. Shear connection ties are to be placed at the location of control joints at 600mmspacings (vertically). See Fig 7.2.1 for ring beam details.

Fig 7.2.1 Typical Hebel Ring Beam Detail

Bond Beam (for vaulted roofs)

A bond beam is a continuous beam around the perimeter of a building for the purpose of providing lateral stability and bracing to the walls for vaulted/cathedral roofs, to minimise cracking at openings. As a minimum, bond beams are to be located at the top of the walls for each floor level, or at a maximum vertical spacing of 3m. Bond beams are constructed of reinforced concrete which is poured in situ between two Hebel PowerBlocks. The minimum dimension of the bond beam must be 100mm wide and 200mm high. Bond beam reinforcement should be not less than 2 rows of 12mm deformed bars placed top and bottom in the centre of the beam (overlapped at least 400mm where it joins).

Bond beams must be continuous around a built-in corner. The ring beam at the base is still required. See Fig. 7.2.1.

Fig 7.2.2 Typical Hebel Bond Beam Detail

Compression

The assessment of Hebel PowerBlock wall compression capacity in this Design and Installation Guide is based on the scope of this design guide (see Section 6.0 and Table 6.1). Three top support conditions are applicable:

1) Supporting concrete slab above (see Section 14 and Fig. 14.26)

2) Supporting floor other than concrete slab above (see Section 14 and Fig. 14.28)

3) Face supported framed floor (See Section 14 and Fig. 14.27)

No vertical support of the wall is considered as worst case in the compression capacity assessment. Under that constraint and for wall heights up to 3000mm:

  • 250mm load-bearing external PowerBlock walls have adequate compression capacity for all top support conditions.
  • 150mm load-bearing internal PowerBlock walls to 3000mm height have adequate compression capacity for the first two top support conditions, but is not suitable for face loaded framed floors. If face loaded timber framed floors are designed both sides of the wall, their spans are within 20% and loading is the same, this can be considered top support condition 2. Otherwise 250mm Hebel PowerBlock wall is required.

Roof loading on top of the wall through the top plate is considered top support condition 2.

Bending

250mm Hebel PowerBlock walls up to 3000mm height have adequate bending capacity without edge support in wind classifications N1 to N3.

Table 7.2.1 provides maximum wall lengths between edge restraints for wind classifications N4 to N6 and C1 to C4. Both ends of these walls must have edge support.

Edge support must be an engaged perpendicular wall (bracing wall) or a built-in 89x89x5 SHS column. The designer must detail the plate connections at the base and top of the SHS column and specify adequate ties to the Hebel PowerBlock work.

Shear

Horizontal forces, such as wind and earthquake loading, applied to a building are to be resisted by bracing walls. Bracing walls are located generally at right angles to the walls subjected to these forces. All bracing components in the building shall be interconnected to adequately transfer the imposed loads to the footings.

Table 7.2.1

Wind Classification Maximum Wall Length Between Edge Supports (m)
N4 3.4
N5 2.6
N6 2.1
C1 3.7
C2 2.8
C3 2.1
C4 1.8

Refer to Appendix K in AS3700 for total ultimate racking forces for houses in wind classifications up to N4/C2. Those tables are based on wall height up to 2700mm. For wall height greater than 2700mm up to 3000mm, factor up the loads by 15%. Earthquake categories H1 and H2 are covered by N3/C1 tables and earthquake category H3 is covered by N4/C2 tables.

Table 7.2.2 provides ultimate racking capacities of unreinforced 150mm and 250mm Hebel PowerBlock walls. This table does not include sliding which the designer must also check depending on compression loads on wall in all wind cases and dowel action at base of wall through hold-down rods.

Lintels General

The minimum bearing lengths at the end of all Hebel lintels is 150mm or L/8, whichever is greatest. The bearing PowerBlock must extend past the end of the lintel by min. 100mm.

Hebel Lintels

Hebel lintels are reinforced sections similar to panels. The lintels are used as supports over doorways, windows and other opening.

Lintels shall be installed so that the surface marked ‘THIS SIDE UP’ is uppermost, as the section reinforcement may not be symmetrical. Hebel lintels are not to be cut on-site.

Table 7.2.4 presents the range of standard Hebel lintels and the associated capabilities.

For larger spans, use structural steel lintels as designed by the project structural engineer.

Steel Lintels

Can be used to support PowerBlock work above openings. refer to Tables 7.2.5 and 7.2.6.

Control Joints

During the life cycle of a building, the building and the materials that it is constructed from will move. These movements are due to many factors working together or individually, such as foundation movement (shrinkage and swelling), thermal expansion and contraction, differential movements between materials, climate and soil condition. This movement, unless relieved or accommodated for, will induce stress in the materials, which may be relieved in the form of cracking. To accommodate these movements and relieve any induced stresses, control joints (vertical gaps) shall be installed to minimise cracking in Hebel masonry walls.

Location of Control Joints

Where control joints are required they are best positioned:

  • At no more than 6m spacing unless more stringent requirements are specified in accordance with AS 2870.1996.
  • At intersecting walls and columns.
  • At changes of wall height or thickness, or where chases occur.
  • To coincide with movement joints in adjacent elements of structure (floor or roof)
  • At junctions of dissimilar materials
  • Where architectural or structural features create a ‘weak’ section.

Movement joints are not normally required below DPC level.

Construction of Control Joints

Straight, unbonded vertical joints are the most common type of control joint. Typically, the vertical joint is 10mm wide and filled with an appropriate backing rod and flexible sealant.

Where stability of the design requires continuity across the joint, Hebel control joint ties should be set in every second bed joint.

Movement joints must be continuous through the entire block wall and all surface finishes. When the control joint is aligned with a window or door opening, the joint must be continuous and may need to be offset to deal with the lintel spanning the opening. In such a case a slip joint must be provided under that end of the lintel. Control joints must also be continuous through any bond beams which have been installed in the wall. This can be achieved by breaking the bond beam at this joint during it’s construction. To maintain lateral strength and continuity of the bond beam, the reinforcing rods should bridge the joint with one side of the beam having conduits cast in for the rods to slide while still keeping the wall in plane.

The control joints should be installed as the wall is being constructed as the joint ties must be installed in the centre of the block ensuring the tie is fully bonded with Hebel adhesive.

Service Penetration

To penetrate services through Hebel walls, core out an appropriate sized hole (typically 10mm larger diameter than the service) and run the service through. A flexible sealant should be used to seal the gap around the service, this will also prevent any cracking/movement issues that may occur with the stress imposed on the blocks if the services were placed hard against the Hebel PowerBlock.

For penetrations through fire rated walls, an appropriate fire collar must be used with fire rated sealants. To affix the services to the Hebel walls please refer to the fixing guide in this manual.

Chasing Services Into Hebel

  • Services should be run through cavities where possible to avoid unnecessary chasing into Hebel.
  • Where chasing is necessary some basic guidelines need to be followed.

– All Hebel products 100mm or less must not be chased

– All chases must comply with the BCA

– The depth of the chase must not exceed 25mm

– The width of the chase must not exceed 25mm

– The maximum number of chases allowed is 2 chases per 1 metre length of wall.

– All chases must be backfilled with a material that will adhere to the wall (Hebel Patch or a sand /cement patching mix).

– Chasing can be done with a Hebel Hand Router or a power router fitted with dust extraction.

 Table  7.2.2 Unreinforced Wall

Wall Length (mm) Ultimate Racking Capacity (kN)
150mm PowerBlock 250mm PowerBlock
900
1200 0.5
1800 1.0 1.5
2400 1.5 2.5
3000 2.5 4.0
3600 3.5 6.0
4800 6.5 10.5
6000 10.0 16.5

 Table 7.2.3 Top-Plate & Hold-Down selection Table

Wind Classification 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
C4 G G

Legend

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.

Table 7.2.4: Lintel Selection – Hebel Lintel

Opening Width (mm) Single Storey or Upper Level of Double Storey Lower Level of Double Storey
Tile Roof Sheet Roof
Tiled Roof Sheet Roof Floor Panel Power Floor Floor Panel Power Floor
900 A A A A A A
1200 B B B B B B
1500 B B B B B B
1800 C C C C C C
2100 D D D D D D
2400 D D D D D D
2700 E E E E E E
3000 E E E E E E
3300
3600
3900
4200
Legend (Hebel product code)
A 22046 + 22047
B 22038 + 22039
C 22041 + 22042
D 22043 + 22044
E 82066 + 82067

 Table 7.2.5: Lintel Selection – Equal Angles

Opening Width (mm) Single Storey or Upper Level of Double Storey Lower Level of Double Storey
Tile Roof Sheet Roof
Tiled Roof Sheet Roof Floor Panel Power Floor Floor Panel Power Floor
900 A A A A A A
1200 A A A A A A
1500 A A D C D B
1800 A A E E E E
2100 B A F E E E
2400 D B F F
2700 E C
3000 E E
3300 E E
3600 F E
3900 E
4200 F
Legend
A 2/100X100X6 EA
B  2/100X100X8 EA
C  2/100x100x10 EA
D  2/100x100x12 EA
E  2/150x100x10 UA
F  2/150x100x12 UA

Table 7.2.6: Lintel Selection – Galintel

Opening Width (mm) Single Storey or Upper Level of Double Storey Lower Level of Double Storey
Tile Roof Sheet Roof
Tiled Roof Sheet Roof Floor Panel Power Floor Floor Panel Power Floor
900 A A A A A A
1200 A A A A A A
1500 A A A A A A
1800 A A A A A A
2100 B A A A A A
2400 E D D D D B
2700 E D D D E D
3000 E E E D E D
3300 E E E
3600 F E
3900 E
4200
Legend
A Multi-Rib T-Bar – 200x200x7
B Multi-Rib T-Bar – 200x200x9
C Traditional T-Bar – 200×10/200×10
D Traditional T-Bar – 250×10/200×10
E Traditional T-Bar – 250×12/200×10

7.3 Floor Panel Systems

Hebel Floor Panels are reinforced AAC panels designs as loadbearing components in commercial, industrial and residential construction applications.

A preliminary thickness of the floor panel can be determined from table 7.3.1 in this guide. Contact your local distributor to confirm the selected floor panel thickness is adequate for the design parameters of span, load, deflection, limit and fire resistance level rating.

After the panels are laid, reinforcing bars are placed between the panels in the recess and around the perimeter of the floor to form the ring anchor system in accordance with Hebel specifications.

The joints and ring anchor sections should be lightly pre-wetted, filled with minimum 15 MPa concrete grout, and rodded to ensure complete and level filling of the notch and groove. A mix of CI:S3:A2 (5mm maximum coarse aggregate) with 150mm slump is usually suitable. The grout should completely cover the reinforcing.

The hardness of Hebel Floor Panels is greater than the PowerBlocks. When ring anchors are placed accurately and mortar is poured carefully and screeded properly, the surface is level and smooth.

When Hebel panels are used in external floor areas such as patios or balconies, it is important to use an approved waterproofing membrane.

Hebel Floor Panels provide an excellent, solid, stable base for tile, slate, marble and other hard surface flooring, including bathroom, laundry and other wet area applications.

The smooth flat surface is also perfectly suited to carpet, vinyl, timber boards, parquetry and decorative plywood flooring.

Panels in General 

Panels should not be cut on site unless they are ordered as cuttable. It is preferred they are ordered from the factory at the desired length. Where panels have been cut the exposed reinforcing should be with coated with Hebel corrosion protection compound or an approved equivalent.

Hebel panels are supplied ready for use. They can be simply and easily laid into position with only the joints needing to be mortared. Installation is therefore largely dry and generally no formwork or bracing is necessary. The reinforcing in the panels is custom designed for each project.

Panels installed on Hebel PowerBlock work or steel beans can offer a flooring system that can be laid down exceptionally fast. As well as providing the benefits of rapid construction, differential movement between floors and walls is minimised.

Framed Floors

Hebel PowerBlock construction can incorporate floor construction using joists. Typically the joists are installed onto bearing plates which distribute the floor loads evenly into the supporting blocks. Hebel PowerBlocks are easily shaped to infill between the joists. The infill blocks will provide support for the blocks above the floor framing.

Image 7.3.1:  Installed Floor Panels
Table 7.3.1: HebeL Structural Floor Panels

With Flexible Coverings / No Walls Above (L/250 deflection)
Maximum Panel Length (metres)
Live Load (kPa) 1.5 2.0 3.0
Superimposed Dead load (kPa) 0.0 0.5 1.0 0.0 0.5 1.0 0.0 0.5 1.0
Panel
Thickness
(mm)
150 (4.00) 4.00 3.82 3.60 3.94 3.68 3.49 3.64 3.45 3.30
175 (4.50) 4.50 4.40 4.16 4.50 4.25 4.03 4.20 4.00 3.83
200 (5.00) 5.00 5.00 4.73 5.00 4.83 4.60 4.78 4.56 4.38
225 (5.50) 5.50 5.50 5.24 5.50 5.35 5.10 5.30 5.06 4.86
250 (6.00) 6.00 6.00 5.77 6.00 5.88 5.63 5.83 5.58 5.37

With Rigid Coverings / Walls Above (L/600 deflection)

Maximum Panel Length (metres)
Live Load (kPa) 1.5 2.0 3.0
Superimposed Dead load (kPa) 0.0 0.5 1.0 0.0 0.5 1.0 0.0 0.5 1.0
Panel
Thickness
(mm)
150 (4.00) 3.77 3.55 3.39 3.54 3.36 3.22 3.20 3.07 2.96
175 (4.50) 4.31 4.09 3.92 4.05 3.87 3.73 3.68 3.55 3.44
200 (5.00) 4.88 4.66 4.48 4.60 4.41 4.26 4.19 4.05 3.94
225 (5.50) 5.42 5.18 4.98 5.11 4.91 4.75 4.66 4.51 4.39
250 (6.00) 5.94 5.70 5.50 5.62 5.42 5.25 5.13 4.98 4.85

NOTES TO FLOOR PANEL TABLES:
• Length is calculated based on the minimum bearing.
• Minimum bearing is panel length /80 but not less than 60mm.
• Maximum clear span is panel length less than 2x minimum bearing.
• (Length) is maximum standard panel length in metres.

Image 7.3.2:  Installed Floor Panels

7.4 Decks, Verandahs and Pergolas

When attaching a deck, verandah roof or pergola to your Hebel PowerBlock Wall, the building designer / project engineer must calculate and determine the loads that will be imposed on the Hebel PowerBlocks. For conditions equal to or less than those outlined in table 7.4.2, a timber or steel waling plate may be attached to the block wall as shown in Section 14 details 14.34 and 14.35. This must be affixed using the appropriate number and type of fixings as outlined in Tables 7.4.1 and 7.4.2. The fixings must be either Fischer Injection Mortar 10mm x 80mm long or Ramset Injection Mortar 12mm x 160mm long.

Where the loads that will be imposed on the waling plate exceed the table or the structure is to be detached from the Hebel PowerBlock Walls, a detached post and beam structure may be erected adjacent to the Hebel wall which will ultimately transfer the load directly into the foundation. This type of construction must be designed and certified by the project engineer.

Table 7.4.1 Deck/Verandah Floor Walling Plate Connection
Deck Flooring
    Type
Maximum Anchor Spacing (mm)
Joist Span = 1.2m Joist Span = 2.4m
Timber 800 400
Tile 600 300

Table 7.4.2 Roof Walling Plate Connection

Wind
Classification
Maximum Anchor Spacing (mm)
Rafter Span = 2.4m Rafter Span = 4.0m
Sheet Roof Tile Roof Sheet Roof Tile Roof
N1 1500 900 900 500
N2 1300 800 750 450
N3/C1 1000 650 600 400
N4/C2 700 550 400 300
N5/C3 450 400 250 250

Note:  Walling plate span capacity to be checked by building designer project engineer. 

Image 7.4.1:  Decks, Verandahs and Pergolas

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14.0 Construction Details (Typical)

Base of Wall

Fig 14.1 Hebel PowerBlock work on Stiffened Raft Slab Edge Foundation (elevation)

 

Fig 14.2 Hebel PowerBlock work showing infill block to slab rebate (elevation)

 

Fig 14.3 Internal Load Bearing Hebel PowerBlock work on stiffened raft slab foundation (elevation)

 

Fig 14.4 Concrete PowerBlock Sub-Floor Detail (elevation)

 

Fig 14.5 Roof Top to Plate Fixing to Hebel Wall – Strap (elevation) – for vaulted/cathedral roofs

 

Fig 14.6 Roof Top to Plate Fixing to Hebel Wall – Strap (elevation) – for typical trussed roof

 

Fig 14.7  Strap Fixing to Hebel Walls (isometric – typical trussed roof)

 

Fig 14.8  Double Brick Sub-Floor Detail (elevation)

 

Fig 14.9 Ring Beam Internal Non-Loadbearing Wall (elevation)

 

Top of Wall

Fig 14.10 Internal Hebel Load Bearing Wall and Timber Floor Frame Junction (elevation)

 

Fig 14.11 Truss Spanning Over Non-Load Bearing Hebel Walls (elevation)

 

Fig 14.12 Timber Truss/Joist Fixed to Hebel Walls (elevation)

 

Fig 14.13  Tiled Roof Eve and Hebel Wall Junction (elevation)

 

Fig 14.14  Vaulted Ceiling & Roof Top Plate Fixing To Hebel Wall (elevation)

 

Wall Junctions

Fig 14.15 External Wall and Internal Partition Wall Junction (plan)

 

Fig 14.16  External Corner with Control Joint (plan)

 

Control Joints

Fig 14.17 Control Joint detail (elevation)

 

Fig 14.18 Typical Bond Beam Control Joint – elevation

 

Fig 14.19 Typical Control Joint – plan 

 

Fig 14.20 Typical Ring Beam Control Joint – elevation

 

Fig 14.21 Hebel PowerBlock work Typical Movement Joint Detail (elevation)

 

Fig 14.22 Hebel PowerBlock work Typical Movement Joint Detail (plan)

Fig 14.23 Built-in Column Detail (plan)

Fig 14.24 Built-in Column Detail (elevation)

Floors

Fig 14.25 Non-Load Bearing Hebel PowerBlock Wall and Hebel Floor Panel Detail (elevation)

 

Fig 14.26 Loadbearing Hebel PowerBlock Wall and Floor Panel Junction Detail (elevation)

Fig 14.27  Loadbearing Hebel® PowerBlock™ Wall and Timber Floor Frame Junction Detail (elevation)

 

Fig 14.28 Timber Floor Support Detail (elevation)

 

Fig 14.29  Hebel Flooring Panels using Ring Anchor Construction on Load Bearing Interior Wall (elevation)

 

Fig 14.30 Ceiling Support Detail A (elevation)

 

Fig 14.31  Ceiling Support Detail B (isometric)

NOTE: Refer to section 7.12 of the Hebel Technical Manual
for the full set of Details on the Floor Panel System.

Balcony and Deck

Fig 14.32  Balcony Detail (elevation)

 

Fig 14.33  Balcony Detail (elevation)

 

Fig 14.34  Deck Connection Detail (side elevation)

 

Fig 14.35 Deck Connection Detail (front elevation)

 

Stairs

Fig 14.36  Stairwell (isometric)

 

Fig 14.37  Stair Tread Set-Out (isometric)

 

Fig 14.38 200mm wide x 50mm thick Hebel PowerBlocks adhered to walls on their ends to provide support for treads (isometric)

Openings

Fig 14.39 Steel Door Frame (Internal or External) to Hebel Wall Fixing (plan)

 

Fig 14.40  Steel Door Frame (Internal or External) to Hebel Wall Fixing (plan)

 

Fig 14.41  Timber Door Frame (External) to Hebel Wall Fixing (plan)

 

Fig 14.42  Timber Door Frame (Internal) to Hebel Wall Fixing (plan)

 

Fig 14.43  Aluminium Window Frame – Window Sill Detail (elevation)

 

Fig 14.44 Aluminium Window Frame – Window Jamb Detail (elevation)

 

Fig 14.45  Aluminium Window Frame – Window Head Detail (elevation)

 

Fig 14.46 Lintel Installation
(a) Elevation

(b) Section

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15.0 Construction Details – Tie-down PowerBlock

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

Wind Classification 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
C4 G G
Legend
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

Wall
Length
(mm)
Min. No. of
N12 Bars
Ultimate Racking Capacity (kN)
150mm PowerBlock 250mm PowerBlock
900 2 5 6
1200 2 8 8
1800 3 16 18
2400 3 24 25
3000 4 36 38
3600 5 45 46
4800 6 54 56
6000 7 63 66

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)

Wall Junctions

Fig 15.12  External Wall and Internal Partition Wall Junction  (plan)

 

Fig 15.13  External Corner with Control Joint (plan)

 

Control Joints

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)

PLEASE NOTE:
For all other design details (eg. door, window, floor panels) please follow the previous construction details in Section 14.0)

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