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 was published on 17 January Frank Van der Woude B. No need to be fancy, just an overview. AS Code Changes.

January December The position of the trees do not comply with the Australian building standards code but council is not supportive. Regards David my mobile is Reply Leave a Reply. Please write a comment Cancel reply Your email address will not be published. Author Write something about yourself. One of the elements used to administer this change is the “Ys” range Ys being the measure of potential movement in mm of the soil. This latest release has seen a number of changes introduced which will in turn affect the current design calculations for residential slabs-on-ground.

Your email address will not be published. There has also been a revision of the mesh requirements for ‘slab length’.

PolyVoid – The Australian Standard has Changed

For all sites in particular sites with reactive soils drainage and soil moisture conditions around the building need to be managed to avoid abnormal moisture conditions, as outlined in Clause 1. These changes will also see the cost of a “conventional” waffle go up as more piers will be specified in order to satisfy the new requirements of the code.


It is measured in millimetres and suggests the value of which the soil might move due to changes in moisture.

Steel Reinforcing Calculations Some of the reinforcing requirements for design have changed ztandard have the potential to have a significant affect on the cost of a waffle slab. Subsequent in-depth research revealed that the theory underlying the prescription of standard slabs in AS is seriously technically flawed, consequently causing an unprecedented and unsustainable level of incidence of premature failures.

The footing systems for which designs are given include slab on ground, stiffened rafts, waffle rafts, strip footings, pad footings and piled footings. Your comments will be very much appreciated. Residential slabs and footings.

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.

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 dwelling, including buildings classified as Class 1 and Class 10a in the Building Code of Australia. Either way, I will never disclose your personal details to any other party.


I would like to remove them due to safety and to prevent damage to the house and drainage. 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.

They disregard our safety as2807 favour of the tree protection.

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AS — This is a free 7 page sample. The Standard may also be used for other forms of construction, including some light industrial, commercial and institutional buildings if they are similar to houses in size, loading and superstructure flexibility.

Rudimentary engineering calculations raised my initial concern that some standard slabs were not strong enough to withstand the combined effects of static loading and dynamic foundation movement they had supposedly been designed to withstand. Could you please send me the 7 page sample. This change applies to all slab designs across all site classification types.

Standards Catalogue

This Standard gives no advice on detailing of the connection of superstructures to the footing systems for wind loads or earthquake loads. Key Contacts Make an Enquiry. This is a free 7 page sample. It was approved on behalf of the Council of Standards Australia on 20 December These calculation changes will ultimately see waffle slabs being more heavily piered than previously.