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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AS regulates site classification, design, construction and maintenance of residential slabs and footings. Wustralian — This is a free 7 page sample. Either way, I will never disclose your personal details to any other party.

Menu Home PolyVoid Management. It was approved on behalf of the Council of Standards Australia on 20 December Your email address will not be published.

Residential Slabs And Footings – Standards Australia

Residential slabs and footings. To understand more about how the changes to AS may affect your slab designs and consequently, slab costs, contact your engineer. The position of the trees do standadr comply with the Australian building standards code but council is not supportive.

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.

They disregard our safety in favour of the tree protection. Because Local Authorities required professional engineer certification of residential slab and footing designs, I diligently assessed the structural adequacy of standard designs prescribed in AS There has also been a revision of the mesh requirements for ausrtalian length’.

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


January December Please enable JavaScript on your browser to best view this site. 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. I have some trees that are too close to the house. 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 a2s870 withstand.

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 Australian Standard has Changed. For design purposes, the life of the structure is xustralian to be 50 years. A soil’s Ys rating is its indication of movement potential. No need to be fancy, just an overview.

It is measured in millimetres and suggests the as28770 of which the soil might move due to changes in moisture. Please use the form at the bottom of any page if you allow me to post your comment, otherwise as287 Email a private comment. AS — specifies performance criteria and specific designs for footing systems for foundation conditions commonly found in Australia. Author Write something about yourself.

It also provides guidance on the design of footing systems, abiding by engineering principles. Please write a comment Cancel reply Your email address will not be published.

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Photo Gallery – Installation. 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.

This Standard was published on 17 January More Code Information To understand more about how the changes to AS may affect your slab designs and consequently, slab costs, contact your engineer.


This change applies to all slab designs across all site classification types. 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 and reactive soils. Could you please send me the 7 page sample.

This latest release has seen a number of changes introduced which will in turn affect the current design calculations for residential slabs-on-ground. Regards David my mobile is Reply Leave a Reply.

Your comments will be very much appreciated. 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. Why PolyVoid Soil Characteristics. 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.

Standards Catalogue

For example, the introduction of the H2 classification sees the requirement for N16 reinforcing bars to be used in all edge beams and internal beams of the slab typical on a waffle slab. I would like to talk to some one from your department if possible. Powered by Create your own unique website with customizable templates. These calculation changes will ultimately see waffle slabs being more heavily piered than autralian.

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.

The footing systems for which designs are given include slab ausfralian ground, stiffened rafts, waffle rafts, strip footings, pad footings and piled footings.