Browse Forums General Discussion 1 Feb 01, 2014 5:50 am Hi, I have been searching for ages trying to work out the differences between slab classes. That is, what differentiates M, H1, H2 etc. By this, I mean structurally. Everything I find simply shows the soil class and movement and what class is suitable. The closest I have found is that they use stiffer/thicker reo. Is there more to it? Can anyone explain the structural differences between the classes? Our slab has been classified as H2 and I don't have any issues with that, it is just for my own interest. Cheers, Brad Re: Differences between slab classes 2Feb 01, 2014 7:17 am As the soil classification goes worse the slab needs to be stiffer. Normally the way that this is achieved is by increasing the amount of the reinforcing steel. This can be either be by increasing the diameter of the bars or adding additional bars. If you want more info you will need to talk with a structural engineer as you are starting to get into the detail of design. ( Although I'm a qualified civil engineer I don't have the experience to design an economical slab and would use a structural engineer myself[who would probably use a computer program to design the slab]) The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: Differences between slab classes 3Feb 01, 2014 7:37 am The worse your soil classification the stronger your slab has to be. As Brian says the reo is thicker and more frequent, the edge beams and footings are deeper and wider as are the intermediate stiffening beams - all of which are incorporated into the monolithic concrete slab. This here http://www.google.com.au/url?q=http://w ... iMwlcizjNA is worth downloading and is the standard that these classes are based on and well worth a read. Stewie Re: Differences between slab classes 4Feb 01, 2014 3:45 pm I thought all the slabs on our side would need to be just h1 brad? Our report showed that You can call me Chris! Altona 4bd Media Ent by Allworth @ Bonnells Bay NSW Check out my attempt at a blog! http://bonnellsbayaltona.blogspot.com.au/ Re: Differences between slab classes 5Feb 01, 2014 3:46 pm Actually, looking at the geotechnical report, I thought yours was m, with the other 3 on our side being h1?? You can call me Chris! Altona 4bd Media Ent by Allworth @ Bonnells Bay NSW Check out my attempt at a blog! http://bonnellsbayaltona.blogspot.com.au/ Re: Differences between slab classes 6Feb 02, 2014 1:26 pm Thanks guys that's a bit more of what I was after. Casabonka, mine was classified as H2 based on the fill required at the front during site prep. That's what the geotech report from the builder's geotech guy said anyway. Re: Differences between slab classes 7Feb 03, 2014 7:34 am With a Class M 'articulated masonry veneer' the internal beam spacings are a max. of 6.0 met, beam depth is 400mm & bottom mesh is 3-L11. H2 max. beam spacing is 4.0 met. beam depth 600mm & bottom mesh 3-L12 Peter Clarkson - AusDesign Australia www.ausdesign.com.au This information is intended to provide general information only. It does not purport to be a comprehensive advice. Old Home Restoration / Renovation To reduce noise transfer without compromising the aesthetic of your exposed I beams, consider filling the 100mm gap between the I beams and the floor above with dense,… 6 9124 The engineering is the engineering. It's irrelevant how much material you have. Unless it fits the requirements of your design the engineer can't "make"it work. You might… 7 9686 |