Design, construction and maintenance of residential slabs is regulated by Australian Standard AS – Residential slabs and footings. Australian Standard AS – Time for a change. With specific reference to the slab heave problem with waffle rafts. Frank Van der Woude, B.E., Ph.D. AGS Vic. complying with the Australian Standard – AS referenced by the BCA. AS covers the design and construction of residential slabs and footings.

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This Standard sets out the criteria for the classification of a site and the design and construction of a footing system for a single dwelling house, townhouse or similar structure which may be detached or separated by a party wall or common wall, but not situated vertically above or below another atandard, including buildings stanard as Class 1 and Class 10a in the Building Code of Australia.

It also provides guidance on the design of footing systems, abiding by engineering principles. Economical designs that avoid significant damage are practicable only if the soil moisture content of the foundation material under the footing or slab is stable or within reasonable limits of stability over the design life of the house or structure.

The table above highlights one of the most significant changes to the code, being the splitting of the “H” classification into two new classes, H1 and H2. I would like to talk to some one from your department if possible.

One of the elements used australain administer this change is the “Ys” range Ys being the measure of potential movement in mm of the stabdard. There has also been a revision of the mesh requirements for ‘slab length’.


Subsequent in-depth research revealed that the theory underlying the prescription of autsralian slabs in AS is seriously technically flawed, consequently causing an unprecedented and unsustainable level of incidence of premature failures.

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Coincidentally with the introduction of AS inI started a consulting engineering practice in and around Brisbane, specializing in residential slab and footing design. These calculation changes will ultimately see waffle slabs being more heavily piered than previously. This latest release has seen a number of tsandard introduced which will in turn affect the current design calculations for residential slabs-on-ground.

Steel Reinforcing Calculations Some of the reinforcing requirements for design have changed and have the potential to have a significant affect on the cost of a waffle slab. Frank Van der Woude B. Powered by Create your own unique website with customizable templates. Your comments will be very much appreciated.


Regards David my mobile is Reply Leave a Reply. Menu Home PolyVoid Management. Please enable JavaScript on your browser to best view this site. This Standard was ass2870 on 17 January AS Code Changes.

Powered by Site Ninja. Could you please send me the 7 page sample. For more information about ASclick here: Residential slabs and footings. Your email address will not be published. Author Write something about yourself. AS — This is a free 7 page sample. AS — specifies performance criteria and specific designs for footing systems for ax2870 conditions commonly found in Australia.

Standards Catalogue

For design purposes, the life of the structure is taken to be 50 years. For all sites in particular sites with reactive soils drainage australiann soil moisture conditions around the building need to be managed to avoid abnormal moisture conditions, as outlined in Clause 1.

Key Contacts Make an Enquiry. The previous code revision called for reinforcing mesh to be upgraded to the next specification when a concrete slab was greater than 25 metres in length.


This Standard gives no advice on detailing of the connection of superstructures to the footing systems for wind loads or earthquake loads. Please use the form stadnard the bottom of any page if you allow me to post your comment, otherwise please Email a private comment. Please write a stancard Cancel reply Your email address will not be published. The footing systems for which designs are given include slab on ground, stiffened rafts, waffle rafts, strip footings, pad footings and piled footings.

The Australian Standard has Changed.

Welcome to my engineering blog – Australian Standard AS

Rudimentary engineering calculations raised my initial concern that some standard slabs were not strong enough to shandard the combined effects of static loading and dynamic foundation movement they had supposedly been designed to withstand. Photo Gallery – Installation. A soil’s Ys rating is its indication of movement potential. This change applies to all slab designs across all site classification types.

No need to be fancy, just an overview.

To understand more about how the changes to AS may affect your slab designs and consequently, slab costs, contact your engineer. Here are some of the key changes to this code and how they lead to a PolyVoid designed suspended slab-on-ground being highly competitive, and a solution for problem foundations standatd reactive soils. January December I have some trees that are too close to the house.