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.
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.
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.
The structural design information in this guide is based on the data and assumptions in Table 6.2, 6.3 and 6.4.
Fig. 6.1 details Hebel® recommendations for how to design a Hebel® PowerBlock home.
Design Flow Chart
Determine the soil classification, terrain category and wind region/loads
Footing type (slab or strip footing)
PowerBlock™ design based on BCA requirements, loadings, wall heights
and lengths (external & internal)
Design the bracing and tie down methods
Determine any additional BCA requirements (thermal, fire and sound ratings)
Complete project documentation (drawings & specification)
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 heigh||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|
Table 6.4 Design Parameters – Wind Actions (General wall areas)
|Wind Classification(AS4055)||Wind Pressure (kPa)|
|Serviceability, Ws||Ultimate, Wu|
Hebel PowerBlock home