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aerated concrete block

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3.0 Energy Efficiency

Table 3.1 shows a number of different external wall configurations and identifies which satisfy the BCA requirement for Climate Zones 1 to 8. Table 3.2 lists the component R-Values used as a basis for Table 3.1. For more information on Hebel and energy efficiency refer to Section 3 and Appendix C and D of the Hebel Technical Manual.

Table 3.1:  BCA Energy Efficiency Compliance
Wall Configuration Satisfies BCA Requirements
Climate Zone: 1* 2* 3* 4 5 6 7 8
Class 1 & Class 10a Minimum R-Value: 1.4 1.4 1.4 2.2 1.9 2.2 2.4 3.3
1. 250mm Block Only Y Y Y N Y N N N
2. 250mm Block + 25mm Cavity Y Y Y Y Y Y N N
3. 250mm Block + 25mm Cavity + Sarking Y Y Y Y Y Y Y N
4. 250mm Block + 25mm Cavity + 75mm PowerPane Y Y Y Y Y Y Y N
5. 250mm Block + 40mm Cavity + R1.0 Insulation Y Y Y Y Y Y Y N
6. 250mm Block + 25mm Cavity + Double Sided RFL + 25mm Cavity Y Y Y Y Y Y Y Y
7. 250mm Block + 90mm Cavity + R2.0 Insulation Y Y Y Y Y Y Y Y

*Note: For elevated ground floor slabs an R-Value of 1.9 is required

Table 3.2:  Wall Element R-Value
System Number Construction Overall Thickness R-Value Rw Rw+Ctr
401 8mm Render in Texture Coat and Paint250mm Hebel PowerBlock 10mm Gyprock 268 mm 2.1 48 43
402 8mm Render in Texture Coat and Paint250mm Hebel PowerBlock 28mm furring channels @600mm centres 10mm Gyprock 296mm 2.3 51 43
403 8mm Render in Texture Coat and Paint250mm Hebel PowerBlock 28mm furring channels @600mm centres Non reflective (normal sarking) 10mm Gyprock 296mm 2.3 51 43
404 8mm Render in Texture Coat and Paint250mm Hebel PowerBlock 28mm furring channels @600mm centres Reflective foil 10mm Gyprock 296mm 2.6 51 43
405 8mm Render in Texture Coat and Paint250mm Hebel PowerBlock 28mm furring channels @600mm centres with 50mm 11kg – Bradford Glasswool Non reflective (sarking) 10mm Gyprock 296mm 3.1 53 44
406 8mm Render in Texture Coat and Paint250mm Hebel PowerBlock 8mm Render in Texture Coat and Paint 216mm 2.1 48 43

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4.0 Fire

Hebel AAC has a BCA Group Number 1. Hebel PowerBlock walls satisfy BCA 2008 Vol.2 Clause 3.7.1.5 (a) (iii) masonry construction and therefore suitable for boundary wall construction on a Class 1 building.

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6.0 Design Approach

There are 2 methods of construction – typical and tie-down. Typical is the most common method of building whilst the tie-down method is required for cyclonic or high wind areas (as determined by an engineer). This guide provides information for both building methods.

Important Note

It is the responsibility of the architectural designer and engineering parties to ensure that the information in the Hebel PowerBlocks Design and Installation Guide is appropriate for the intended application. The recommendations of this guide are formulated along the lines of good building practice, but are not intended to be an exhaustive statement of all relevant data. Hebel accepts no responsibility for or in connection with the quality of the recommendations or their suitability for any purpose when installed.

Scope

The Hebel PowerBlocks Design and Installation Guide has been created to provide information for detached residential buildings. The design information in this guide has been condensed from the Hebel Technical Manual and AS3700 Masonry structures. The design basis is AS3700 Masonry structures, Section 12 Simplified design of masonry for small buildings. The footing and slab design is based on AS2870 Residential slabs and footings – Construction.

Refer to Table 6.1 for Building Geometry Limitations.

Design Parameters

The structural design information in this guide is based on the data and assumptions in Table 6.2, 6.3 and 6.4.

Design Sequence

Fig. 6.1 details Hebel recommendations for how to design a Hebel PowerBlock
home.

Fig 6.1:  Flow Chart.

Table 6.1: Buiding Geometry Limitations

2 storeys max
Max. height to underside of eaves 6.0m
Max. height to top of roof ridge 8.5m
Max. building width incl. verandah but not eaves 16.0m
Max. building length 5x width
Max. lower storey wall height 3.0m
Max. upper storey wall height 2.7m
Max. floor load width on external wall 3.0m (6.0m single span floor)
Max. roof load width on external wall 3.0m (6.0m rafter/truss span)
Max. floor load width on internal wall 6.0m

Where the building geometry is outside the above limitations, the designer must refer to the Hebel Technical Manual and AS3700 Sections 1-11.

Table 6.2: Design Parameters

Hebel PowerBlock material properties:
Nominal Dry Density 470 kg/m2
Working Density (S.T.) 611 kg/m2
Working Density (L.T.) 500 kg/m2
Characteristic Compressive Strength, f’m 2.25 MPa
Characteristic Flexural Tensile Strength, f’mt 0.20 MPa
Characteristic Shear Strength, f’ms 0.30 MPa
Characteristic Modulus of Elasticity, EST 1125 MPa
Characteristic Modulus of Elasticity, ELT 562 MPa

Table 6.3 Design Parameters – Permanent and Imposed Actions

Permanent Actions (Dead Loads):
Floor – Superimposed 1.00 kPa
Roof – Tile 0.90 kPa
Roof – Sheet 0.40 kPa
Framed Floor/Deck – Timber 0.50 kPa
Framed Deck – Tile 0.50 kPa
Pergola Roof – Tile 0.80 kPa
Pergola Roof – Sheet 0.32 kPa
Hebel PowerFloor System 0.80 kPa
Hebel Floor Panel System – 250mm 1.90 kPa
Hebel PowerBlock Wall – 250mm, 2700mm (H) 4.60 kN/m
Hebel PowerBlock Wall – 150mm, 2700mm (H) 2.76 kN/m
Imposed Actions (Live Loads):
In accordance with AS 1170. 1:2002
Floor – general 1.50 kPa
Deck 2.00 kPa

Table 6.4  Design Parameters – Wind Actions (General wall areas)

Wind Classification
(AS4055)
Wind Pressure (kPa)
Serviceability, Ws Ultimate, Wu
N1 0.41 0.69
N2 0.41 0.96
N3 0.61 1.50
N4 0.91 2.23
N5 1.33 3.29
N6 1.82 4.44
C1 0.61 2.03
C2 0.91 3.01
C3 1.33 4.44
C4 1.82 5.99

 Image 6.1:  Hebel PowerBlock home

Image 6.2:  Hebel PowerBlock home

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Appendix A – Carpet Installation

Panel Surface Preparation

Sweep the floor surface to remove debris and loose particles. Expose all surface blemishes such as chips, cracks, gaps, ridges or the like. Fill all unacceptable locations with an appropriate and compatible patching compound such as Hebel® Patch or levelling compound as required. Ensure panels are then dry.

Carpet Smooth Edge Installation

Installation of Carpet Smooth Edge (Gripper) is to be in accordance with AS/NZS 2455.1:1995.

Installation of carpet gripper prior to laying carpet requires the use of specifically selected nails or course threaded screws. Standard fixings supplied with the carpet gripper are not suitable for fixing to Hebel® PowerFloor™ panels. Carpet gripper strips are available without factory supplied nails. For carpet gripper installation near the panel edge, only glue is recommended. If relying on glue only, the carpet can not be stretched until the glue is set after approximately 24 hours.

Table A.1 – Carpet Smooth Edge Fixings

Fixing Type Description Application
Method
Installation Notes
Twist Nails 51mm dome
head twist nail
Coil Nail Gun
(Refer to Fig A.1)
The head of the twist nail
should finish flush with
the surface of the gripper
strip
Screws Type 17 point
– course thread
No. 8g x 50mm
– Countersinking
screw
Makita 6834
Auto Feed
Screwdriver
(Refer to Fig A.2)
The head of the twist nail
should finish flush with
the surface of the carpet
gripper strip
Screws Type 17 pointTrimhead deck
Screw.
4.2 x 50mm
4.2 x 65mm
Quickdrive auto feed The head of the screw
should be flush with the
smooth edge

Underlay Installation

Minimum medium duty underlay is to be used. No other special requirements.

Carpet Installation

As per carpet manufacturer’s guidelines.
No other special requirements.

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