Browse Forums Buying Land Re: Engineered fill in Springfield Rise 10Jul 21, 2022 7:06 am alexp79 If the fill is compacted to at least 95% (which it should as otherwise not compliant), then you could simply replace 30 cm with compacted sand (on top of geotextile), set up perimeter drainage (soil under your slab should be slightly inclining towards the drainage) and then ask your engineer to design 25 cm thick floating slab (no need to dig for footings, the whole slab is one big footing), which can be reinforced with 2 layers of SL92 mesh (as well as additional U-bar reinforcement at the edges). This is will be quite similar to German Dow slab system with the exception that Dow slabs are built on top of 10 cm of XPS for extra thermal insulation. To further reduce costs on labour, instead of deploying 2 layers of reinforcement, you can just ask your concrete supplier to mix in 10 kg/m3 of HelixSteel micro reinforcement into your concrete mix (the actual proportion would have to go through the approval of HelixSteel structural engineer though, but usually 10 kg/m3 is enough to replace 2 layers of mesh in a thick slab). In this configuration, you will certainly spend more on a concrete as well as extras on sand, soil removal and sand compaction, however, this way you will save a lot of time and labour on additional ground works, reinforcement, pods and more importantly piering, so in the end of a day, you may end with the same costs but with much more piece of mind. In comparison to standard waffle pod slab, your slab will be much better protected from any soil movement caused by the slab heaves as well as water ingress under the slab. Just my 2 cents. And a nature strip tree ? Engineering timber is certainly a less fuss option, times cheaper to supply and install and better withstands humidity. 1 16289 Thanks Simon, I guess I'm no concerned with the volume of the noise rather that dead and hollow sound and feel that is associated with floating floors. But I'm not sure… 3 6356 2 4473 |