Duratex Fibre Cement

BGC Duratex is designed to provide a solid substrate for applied decorative finishes when combined with proprietary jointing and coating systems.

BGC Duratex provides a tough, durable, waterproof wall cladding system.

Duratex:

  • Is tough and durable.
  • Is a waterproof wall cladding system.
  • Is fire resistant.
  • Ideal for lightweight construction.
  • Factory applied blue tint for ease of identification.
  • Can be used in residential and commercial applications.
  • Accepts a wide range of textured coatings.

 

THICKNESS
 (mm)
WIDTH
 (mm)
LENGTH (mm)
1800 2440 2725 3000
7.5 900 x x x
1200 x x x x
9 900
1200 x x

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Duralattice Lattice Sheets

 Duralattice combines the charm and appeal of traditional lattice with the practicality and inherent durability of fibre cement. Duralattice is both decorative and functional and can be used in and around the house and garden.

Duralattice can be used in many different ways including: Gazebos, pergolas, privacy screens, poolside enclosures. Duralattice can also be used for shade providing structures as well as feature panels. Let your imagination stretch the use of Duralattice.

Duralattice:

  • Manufactured as a single flat sheet.
  • Two distinctive patterns available –diamond and square.
  • Block approx. half of the suns rays.
  • Many different uses.
  • No metal fittings that will deteriorate,stain or pull apart.
  • Easy to cut, fix and decorate.
  • Immune to permanent water damage,termites and will not rot or warp.
THICKNESS
(mm)
THICKNESS
(mm)
LENGTH (mm)
1800 2400
6 900 x
1200 x x

*some sizes may not be available in all states, please check with your local BGC office for
availability.

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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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12.0 PowerBlock Handling

Manual Handling

To minimise the possibility of manual handling injuries, Hebel suggests the following:

  • Use mechanical aids, such as trolleys, forklifts, cranes and levers, or team lifting to move Hebel.
  • Keep the work place clean to reduce the risk of slips, trips and falls, which can cause injury.
  • Plan the sequence of installation to minimise panel movements and avoid awkward lifts.
  • Good lifting techniques to be adopted to minimise the risk of injury.

Mechanically Assisted Handling

Moving and handling Hebel Floor Panels and Hebel Lintels should be done using mechanical aids such us forklifts, cranes and special panel lifting trolleys. Different panel lift attachments are available for installing panels. For purchasing or hire of these devices please contact CSR Panel Systems.

Health, Safety & Personal Protective Equipment (PPE)

Hebel AAC products are cement-based, which may irritate the skin, resulting in itching and occasionally a red rash. The wearing of gloves and suitable clothing to reduce abrasion and irritation of the skin is recommended when handling Hebel AAC products.

Approved respirators (AS/NZS1715 and AS/NZ1716) and eye protection (AS1336) should be worn at all times when cutting and chasing. Refer to the Hebel Material Safety Data Sheets (MSDS).

Fig. 12.1 Standard personal protection equipment.

Cutting

The use of power tools when cutting masonry products may cause dust, which contains respirable crystalline silica, with the potential to cause bronchitis, silicious and lung cancer after repeated and prolonged exposure. When using power or hand tools, on Hebel products, wear a P1 or P2 respirator and eye protection. When cutting, routing or chasing Hebel products with power tools, use dust extraction equipment and wear appropriate hearing protection.

Reinforcement exposed during cutting is to be coated with a liberal application of Hebel corrosion protection paint.

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1 Design QT Eco Series

1.1 Material Properties

Width Length Thickness Weight
900mm x 2250mm x 50mm (nom) 40kg (nom)
  • Total Square Metres per Panel = 2.0 m2.
  • Number of 50mm Panels per Pallet = 23 panels Pallet Weight:- 940kg (approx) (± 20 kg safety factor).
  • Pallet Size – 900mm Width x 2250mm Length x Max. 1350mm Height (nom).

1.2 Thermal Performance

The Thermal performance of the QT EcoSeries Wall System is calculated in accordance with AS 2627.1 Thermal Insulation of Dwellings. QT EcoSeries Wall Panel has a k-value of 0.07 w/mk.

Wall System Composition

* Note: R-Values in table have been rounded up or down to the nearest R0.5 as permitted under AS 2627.1.

1.3 Impact Resistance

QT EcoSeries Wall Panel when coated with a cement base render, can provide resistance for hard body impacts typically found under normal situations. (Refer coating manufacturers for details).

1.4 Acoustic Performance

The QT EcoSeries Wall System was tested in accordance with AS/NZS 1276.1 for Airborne Sound Transmission and achieved STC41 and Rw41(-3;-8)(Wall Composition: 50mm QT EcoSeries Wall Panel with 30mm (nom) cavity on a 70mm x 35mm stud frame and 10mm plasterboard) CSIRO TL399. Acoustic performance can be significantly increased with the addition of bulk or acoustic insulation batts.

1.5 Fire Performance

QT EcoSeries Wall Panels when tested to AS/NZS 3837 and in accordance with BCA Specification C1.10a Section is classed as a GROUP 1 material.

Early Fire Hazard Indices (Test to AS/NZS 1530 Part 3)
Ignitability Index 0
Spread of Flame Index 0
Heat Evolved Index 0
Smoke Developed Index 0-1

 

1.6 Durability

In normal conditions and when maintained properly in a weather proof condition, the cladding systems should exceed 30 years of trouble free serviceable life. When the system is installed in high corrosion zones, such as coastal locations within distances of up to 500m from the sea, particular care must be taken to ensure that openings through the cladding panels are kept to a minimum to prevent corrosive salt aerosols from entering the wall cavity and affecting metal components. (Permitted openings are base weepholes, soffit vents and openings beneath window joinery at sills).

Wildlife Attack

The panels will not support growth of micro-organisms such as fungi or bacteria and do not hold any nutritional value for ants or rodents.

1.7 Cavity

Cavities form an important role in the weathertightness and life cycle of any wall system QT EcoSeries Wall Panels constructed without a cavity will void any warranty. The cavity acts as a secondary barrier against wind driven rain penetration entering the wall framing. The cavity also allows the wall to ventilate and drain which is essential for a healthy wall.

1.8 Vapour Permeable Sarking

Vapour permeable sarking must be installed to the face of the building framing prior to installation of the battens and panels. The vapour permeable sarking has two main functions, weathertightness and thermal resistance. In its weathertightness role it protects the building framing from direct contact with moisture generated by wind driven rain penetration, while allowing the condensation of moisture from interior artificial heating and cooling to escape. Thermally the vapour permeable sarking divides the wall into two separate air spaces, which significantly increases the thermal performance of the wall.

1.9 Weepholes

On the first horizontal course (ground level) weep holes are to be installed at centres not exceeding 1200mm immediately above any damp proof membrane or flashing. Weepholes are also required in areas where there is a possibility of moisture build up. Weepholes must be limited to 8mm in width to reduce the potential for vermin access.

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3 Corners, Joints & Junctions QT Eco Series

3.1  External Corners

Internal corners can be formed by continuing the QT FullMesh around the corner or by embedding a QT CornerMesh into the base coat render. External corners can be formed by embedding a QT CornerMesh into the base coat render or by fixing a corner bead prior to rendering. In all cases the abutting corner panels must be bonded with polyurethane foam adhesive.

External Corners

3.2  Relief Joints

Relief joints are required to accommodate any structural movement or panel movement due to temperature or moisture changes. If the panel above or below an opening is less than 300mm in depth or more than 2400mm in length the panel must be articulated by creating a vertical expansion joint to reduce and/or relieve the stress in the panel and coating system. All other corner openings must be reinforced with QT 45˚Mesh. The QT 45˚Mesh helps prevent any 45˚hairline cracks forming from the corner of any opening.

Relief Joint Setout

3.3 Control joints

Control joints are designed to relieve structural movement between the wall cladding and building frame and also relieve any stress that builds up in the applied coating system. Vertical control joints are required at no greater than 5 metre centres (+ or – 500mm) in walls greater than 8 metres in length. Double studs are required at all vertical control joints. Vertical joints are best aligned with windows, doors, openings, or internal corners. Where timber floor joists are used a 15mm (nom), horizontal control joint must be provided at floor levels to allow for shrinkage and movement of the joists. 10mm control joints must also occur where the QT EcoSeries Wall Panels meet alternative wall claddings eg. Weatherboard, brickwork, etc. On gable ends, a horizontal control joint will be required at the top plate of the wall so as to separate the gable  wall from the wall below. Control joints can be formed with the use of a backing rod and sealant or by the installation of uPVC expansion bead.

Vertical Expansion Joint

3.4 Junctions

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4 Construction Details QT Eco Series

4.1 Slab & Floor

All foundations must comply with the relevant standards and local authority requirements, with appropriate consideration given to soil type. QT EcoSeries Wall Panel is suitable for construction on concrete slab or suspended floors. The concrete slab can either be rebated or non-rebated. The slab rebate will need to be a minimum of 50mm below floor level and 100mm above paved level or 150mm above ground level (See local standards). To ensure a flush finish, the width of the slab rebate needs to allow for the thickness of the coating system, the thickness of the panel (40mm or 50mm), and the size of the extended wall cavity 20 – 50mm (30mm nom). Minimum ground clearances, must be maintained at all times during the life of the building. Insufficient clearance from the ground to the bottom of the wall panels will affect long-term durability.

4.3 Windows

Wherever possible windows and associated flashings should be installed prior to the installation of the QT EcoSeries Wall Panel. When ordering the window frame it is essential to plan where the window flange will be positioned either flush with the stud frame, flush with battens or even over the panel.

All materials that are susceptible to deterioration due to plastics migration or alkalinity of cement base products must be protected (check with product manufacturer).

4.4 Decorative Mouldings

To provide added design flexibility, decorative mouldings or features can be made using QT EcoSeries Wall Panels. The panel can be cut into bands or laminate multiple layers and shape to achieve the desired profile. Once installed, a coating system would then be applied. Alternatively, a wide range of decorative mouldings are available from various manufacturers.

QT EcoSeries Wall Panels can be cut into bands that can be installed around windows, doors, along horizontal control joints, etc to enrich the aesthetics of the project. They are installed so the top and bottom edge (bevelled at 15 degrees) falls away from the wall. Where bands meet, they should be cut at a 45˚ angle, across the face of the corbel to help conceal the join and increase the adhered surface bond. Bands are bonded into place with polyurethane foam and corbel screws or nails to mechanically fix the bands until the foam is set.

 

4.5 Doors

Door framing must be fixed in position prior to the installation of the QT EcoSeries Wall Panels. The door framing will allow the panel to be cut and installed neat but independent of the frame. Door frames must be fixed to the structural framing. Decorative mouldings can be used to emphasize the door opening.

All materials that are susceptible to deterioration due to plastics migration or alkalinity of cement base products must be protected (check with product manufacturer).


4.7 Wall to Roof

Wall to roof details can often be unsightly as they are easily seen and hard to conceal without compromising the weathertighness of the dwelling. Because of its visibility, it is essential to create clean straight lines either by using a uPVC moulding or cover flashings.

Parapet Type 2

4.8 Soffit & Eaves

The eaves or roof overhang play a significant role in the comfort performance of the building. Eaves or overhangs are used to shade the walls from the summer sun, while capturing the sun’s heat in the winter. Eaves will reduce glancing light, which highlights the wall surface. Glancing light is the light that is nearly parallel to the surface of the wall and casts visible shadows and uneven projections of the surface finish QT EcoSeries Wall Panels can be installed to suit various soffit designs and details.

 

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