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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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For example, australain 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.

This change applies to all slab austalian across all site classification types. Key Contacts Make an Enquiry. Powered by Create your own unique website with customizable templates. 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.

Could you please send me the 7 page sample. AS regulates site classification, design, construction and maintenance of residential slabs and footings. Frank Van der Woude B. For design purposes, the life of the structure is taken to be 50 years. I have some trees that are too close to the house.

PolyVoid – The Australian Standard has Changed

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. A soil’s Ys rating is its indication of movement potential. Either way, I will never disclose your personal details to any other party. Please write a comment Cancel reply Your email address will not be published. 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. There has also been a revision of the mesh requirements for ‘slab length’. These calculation changes will ultimately see waffle slabs being more heavily piered than previously.

Menu Home PolyVoid Management. Coincidentally with the introduction of AS inI started a consulting engineering practice in and around Brisbane, specializing in residential slab and footing design. No need to be fancy, just an overview. 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.

Rudimentary engineering calculations raised my initial concern that some standard slabs were not strong enough to withstand the combined stqndard of static loading and dynamic foundation movement they had supposedly been designed to withstand.

The Australian Standard has Changed.

Your email address will not be published. Auwtralian more information about ASclick here: Please use the form at the bottom of any page if you allow me to post your comment, otherwise please Email a private australiqn. Regards David my mobile is Photo Gallery – Installation.

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.

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.

Standards Catalogue

The footing systems for which designs are given include slab on ground, stiffened rafts, waffle rafts, strip footings, pad footings and piled footings. The Standard may also be used for other forms of construction, including some light industrial, commercial and institutional astralian if they are similar to houses in size, loading and superstructure flexibility.

AS — This is a free 7 page sample.

I would like to talk to some one from your department if possible. 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.


Regards David my mobile is Reply Leave a Reply.

Welcome to my engineering blog

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. AS Code Changes. The position of the trees do not comply with the Australian building standards code but council is not supportive.

The standard sets out the criteria for the classification of a site, and the design and. 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. January December More Code Information To understand more about how the changes to AS may affect your slab designs and consequently, slab costs, contact your engineer.

I would like to remove them due to safety and to prevent damage to the house and drainage. This is a free 7 page sample. This Standard gives no advice on detailing of the connection of superstructures to the footing systems for wind loads or earthquake loads. Please enable JavaScript on your browser to best view this site.

AS — specifies performance criteria and specific designs for footing systems for foundation conditions commonly found in Australia. It was approved on behalf of the Council of Standards Australia on 20 December Powered by Site Ninja. Residential slabs and footings.